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Rumanite

A synonym

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Opal

South Wollo Zone, Amhara Region, Ethiopia

Opal-CT

Mesopotamia copper valley, Khorixas, Kunene Region, Namibia

Opal-CT

Les Rois Mine, Mur-sur-Allier, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France

Opal-CT

Tsehay Mewcha, Delanta Woreda, North Wollo Zone, Amhara Region, Ethiopia

Opal

South Wollo Zone, Amhara Region, Ethiopia

Opal-CT

Mesopotamia copper valley, Khorixas, Kunene Region, Namibia

Opal-CT

Les Rois Mine, Mur-sur-Allier, Clermont-Ferrand, Puy-de-Dôme, Auvergne-Rhône-Alpes, France

Opal-CT

Tsehay Mewcha, Delanta Woreda, North Wollo Zone, Amhara Region, Ethiopia

Opal

South Wollo Zone, Amhara Region, Ethiopia

Opal-CT

Mesopotamia copper valley, Khorixas, Kunene Region, Namibia

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About RumaniteHide

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Name:

Named after the country of Romania.

Synonym of:

'Amber', Opal

Opal or amber from Romania.

Unique IdentifiersHide

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Mindat ID:

9825

Long-form identifier:

mindat:1:1:9825:6

Similar NamesHide

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Eumanite	A synonym of 'Manganocolumbite-Manganotantalite Series'
Ramanite-(Cs)	A valid IMA mineral species	Cs[B₅O₆(OH)₄] · 2H₂O
Ramanite-(Rb)	A valid IMA mineral species	Rb[B₅O₆(OH)₄] · 2H₂O
Riemannite	A synonym of Allophane
Romanit	A synonym of 'Romanite'
Romanite	A synonym of Mianningite	(◻,Pb,Ca)UFe₂²⁺(Ti,Fe³⁺)₆Ti₁₂O₃₈
Rumanit	A synonym of Opal

Synonyms of RumaniteHide

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Roumanite

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Rumanite in petrologyHide

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Internet Links for RumaniteHide

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mindat.org URL:

https://www.mindat.org/min-9825.html
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References for RumaniteHide

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Reference List:

Neacşu, A. (2006) Remarks on The Geological Origin of Rumanite. Acta Mineralogica-Petrographica, Abstract Series 5, Szeged. p 83

Localities for RumaniteHide

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Showing 5,881 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

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Locality ListShow

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- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.



Afghanistan
Badakhshan Zebak District Sanglich ⓘ Alburs	[Opal] Orris et al. (2002)
Balkh Chimtal District ⓘ Alburs sulphur deposit	[Opal] Orris et al. (2002)
Nuristan Kamdesh District ⓘ Paprok	[Opal, Opal-AN var: Hyalite] Jose Zendrera Collection

Algeria
Mostaganem Province Sidi Lakhdar District Sidi Lakhdar ⓘ Kieselguhr Quarry	[Opal] Rocks & Min.: 17:243.

Angola
Luanda Province ⓘ Belas	[Opal, Opal var: Milk Opal] Martins da Pedra collection

Anguilla	[Amber]

ⓘ Crocus Bay Beach	[Amber] Earle (1922)

Antarctica
East Antarctica Victoria Land Elephant Moraine ⓘ Elephant Moraine 83309 meteorite	[Opal] Beard et al. (2009)
ⓘ Mount Adamson	[Opal] Galli et al. (1997)
ⓘ Mt Melbourne	[Opal, Opal-AN var: Hyalite] Collection of RJ Martin
Ross Archipelago Ross Island ⓘ Mount Erebus	[Opal, Opal-AN var: Hyalite] Collection of RJ Martin
West Antarctica Antarctic Peninsula Bransfield Strait ⓘ Hook Ridge	[Opal] Petersen et al. (2004)

Arctic Ocean
ⓘ Kara Sea	[Opal, Opal var: Opaline] Bogdanov et al. (1995)

Argentina
Catamarca Province Ambato Department Los Varela ⓘ Estancia Cóndor Huasi	[Opal] Raúl Jorge Tauber Larry (1971)
Andalgalá Department Aconquija ⓘ Campo del Pucará	[Opal] Raúl Jorge Tauber Larry photo and ...
Andalgalá ⓘ Capillitas mining district	[Opal] Raúl Jorge Tauber Larry
Antofagasta de la Sierra Department ⓘ Campos de Piedra Pómez	[Opal] Tauber (2016)
ⓘ La Borita	[Opal] Sillitoe et al. (2023)
ⓘ Quebrada Angosta	[Opal] Sillitoe et al. (2023)
Belén Department Corral Quemado ⓘ Papachacra	[Opal, Opal-AN] Padrón de Minas de la Provincia de ...
ⓘ Papachacra pegmatites	[Opal] Jewel Tunnel specimens
Sierra de Ancasti El Portezuelo ⓘ El Portezuelo Granite	[Opal] Colombo et al. (2011)
Chubut Province Cushamen Department ⓘ El Mirador	[Opal, Opal var: Fire Opal] Padrón de Minas de la Provincia de Chubut (2005)
Gastre Department ⓘ El Escorial	[Opal] Padrón de Minas de la Provincia de Chubut (2005)
Languiñeo Department Piedra Parada ⓘ Piedra Parada caldera	[Opal] ARAGON
ⓘ Pocitos de Quichaura	[Opal, Opal-AN] Padrón de Minas de la Provincia de Chubut (2005)
Paso de Indios Department ⓘ Cerro Cóndor	[Opal] Estrada et al. (2002)
ⓘ Zeolite occurrence	[Opal] Estrada et al. (2002)
El Sombrero Sierra Cuadrada deposit ⓘ Lagartija occurrence	[Opal] Raúl Jorge Tauber Larry +2 other references
Telsen Department ⓘ Gan Gan	[Opal] Padrón de Minas de la Provincia de Chubut (2005)
Córdoba Province Punilla Department San Roque District Tanti Cerro Blanco pegmatite district ⓘ El Criollo Mine	[Opal] Alfredo Petrov field collected specimens
San Alberto Department Tránsito District Mina Clavero ⓘ Rio de los Sauces	[Opal, Opal var: Milk Opal] Lemanski (n.d.)
Sobremonte Department Aguada Del Monte District ⓘ El Portezuelo district	[Opal] LEAL
Entre Ríos Province ⓘ Colón Department	[Opal] Juan Carlos Lodovichi
Cuarto District ⓘ El Palmar National Park	[Opal] Zucol et al. (2005)
ⓘ Paraná Department	[Opal] Raúl Jorge Tauber Larry (1967)
ⓘ Arroyo Espinillo	[Opal] Raúl Jorge Tauber Larry (1967)
Jujuy Province Cochinoca Department Abra Pampa ⓘ Rachaite	[Opal] Coira et al. (1995)
ⓘ Rachaite prospect	[Opal] Brodtkorb (2002)
Rinconada Department Mina Pirquitas ⓘ Chinchillas Mine	[Opal] Mercado et al. (2025)
La Rioja Province Coronel Felipe Varela department Guandacol ⓘ Cerro Bola	[Opal] LEAL +1 other reference
ⓘ Talampaya National Park	[Opal] Raul J. Tauber Larry
Mendoza Province Malargüe Department Agua Escondida District Altiplano de Payún Matrú ⓘ Payún Matrú Volcano	[Opal, Opal-AN] Petrov (n.d.)
Río Barrancas District ⓘ La Carmelita mine	[Opal] Crosta et al. (2015)
San Rafael Department Cuadro Benegas District ⓘ Lomas Bayas	[Opal] Aguirre-Urreta (1)
Neuquén Province ⓘ Catán Lil Department	[Opal] Montagne et al. (2014)
ⓘ Bajada de Los Molles	[Opal] Tauber (November 2014)
ⓘ Morro del Águila	[Opal] Tauber
Collón Curá Department Piedra del Águila ⓘ Cerro Mesa	[Opal] Mirta Quattrocchio (1)
Loncopué Department ⓘ Agua de La Mula	[Opal] Aguirre-Urreta (1)
ⓘ Caverna de Chorriaca	[Opal] Silvia Barredo (1)
ⓘ Caverna de Huitrín	[Opal] Silvia Barredo (1)
ⓘ Caverna del Salado I	[Opal] Silvia Barredo (1)
ⓘ Caverna del Salado II	[Opal] Silvia Barredo (1)
ⓘ Caverna del Salado III	[Opal] Silvia Barredo (1)
ⓘ Portal de Los Monos	[Opal] Montagne et al. (2014)
Ñorquín Department ⓘ Arroyo Truquicó	[Opal] Darío G. Lazo
ⓘ Caverna de Reni	[Opal] Silvia Barredo (1)
Pehuenches Department ⓘ Loma La Torre	[Opal] Montagna et al. (2014)
ⓘ Puerta Curaco	[Opal] Montagna et al. (2014)
ⓘ Picunches Department	[Opal] Silvia Barredo (1)
ⓘ Bajada del Agrio	[Opal] Montagna et al. (2014)
ⓘ Bajada Vieja	[Opal] Montagna et al. (2014)
ⓘ Caverna del León	[Opal] Silvia Barredo (1)
ⓘ Sierra de la Vaca Muerta	[Opal] Tauber (2014)
ⓘ Zapala Department	[Opal] Montagne et al. (2014)
Río Negro Province Veinticinco de Mayo Department ⓘ Cruz del Sur mine	[Opal] Hayase et al. (1978)
ⓘ Salar del Hombre Muerto	[Opal, Opal var: Opal-C] Raul J. Tauber Larry
Salta Province La Poma Department ⓘ La Torca Mine	[Opal] A. G. Quiroga y T. Ruíz (1994)
Los Andes department San Antonio de los Cobres ⓘ Taron Project	[Opal] Ronald G. Simpson (2017) +1 other reference
San Juan Province Calingasta Department Calingasta ⓘ San Francisco de los Andes mine	[Opal] Zubía et al. (2008)
Iglesia Department ⓘ Filo del Sol mine	[Opal] Perelló et al. (2023)
Valle Fértil Department ⓘ Parque Provincial Reserva Natural Valle de la Luna	[Opal] Raul J. Tauber Larry
San Luis Province Coronel Pringles Department El Trapiche La Florida ⓘ San Luis Mine	[Opal] Galliski et al. (2011)
ⓘ San Luis II pegmatite	[Opal] Cerny et al. (2003) +1 other reference
San Martín Department ⓘ María Elena pegmatite	[Opal] Galliski et al. (2009)
Potrerillos ⓘ Casa de Piedra pegmatite	[Opal] Ribacki et al. (2023)
Santa Cruz Province Deseado Department ⓘ Bosques Petrificados de Jaramillo National Park	[Opal, Opal var: Jasper Opal] Raúl Jorge Tauber Larry
ⓘ Cerro Madre e Hija	[Opal] Aliotta et al. (Santa Cruz)
Tres Cerros ⓘ La Josefina prospect	[Opal] Moreira et al. (2015)
ⓘ San Pedro-La Evelina deposit	[Opal] DEL BLANCO
Lago Buenos Aires Department ⓘ Cerro Negro deposit	[Opal] Vidal et al. (2016)
Sascha Project ⓘ Pelligrini prospect	[Opal] Smith (2009)
Santiago del Estero Province Ojo de Agua Department ⓘ Cantamampa vein	[Opal] LEAL +1 other reference
ⓘ Ojo de Agua vein	[Opal] LEAL +1 other reference
ⓘ Ojo de Agua Veta Sur	[Opal] LEAL +1 other reference
Piedras Blancas ⓘ Piedras Blancas pegmatite	[Opal, Opal-AN] LEAL +1 other reference
Quebrachos Department Sumampa Sumampa Viejo ⓘ Sumampa Viejo vein	[Opal] LEAL +1 other reference
ⓘ Tucumán Province	[Opal] Raúl Jorge Tauber Larry +1 other reference
ⓘ Chicligasta Department	[Opal] Sub secretaría de Minerái de la Nación (1974)
Alpachiri y El Molino Parque Nacional Campo de los Alisos ⓘ Río Jaya	[Opal] Collected by Sebastián Tauber
La Cocha Department El Sacrificio Cerro Quico ⓘ Piedras Blancas deposit	[Opal] Raúl Jorge Tauber Larry
ⓘ Tafí del Valle Department	[Opal] Raúl Jorge Tauber Larry
Amaicha del Valle ⓘ Los Zazos	[Opal] Raúl Jorge Tauber Larry
ⓘ Tío Punco	[Opal] Raúl Jorge Tauber Larry

Armenia
Kotayk Province Hrazdan ⓘ Hrazdan Iron-Ore project	[Opal] Bowell et al. (2021)

Atlantic Ocean
Mid-Atlantic Ridge complex ⓘ Ashadze hydrothermal area	[Opal] Cherkashev et al. (2013)
ⓘ Irinovskoe hydrothermal field	[Opal] Melekestseva et al. (2022)
ⓘ Koralovoe hydrothermal area	[Opal] Sudarikov et al. (2021)
ⓘ Krasnov hydrothermal field	[Opal] Mozgova et al. (2007)
ⓘ Menez Gwen hydrothermal field	[Opal] Lein et al. (2010)
ⓘ Molodezhnoe hydrothermal area	[Opal] Sudarikov et al. (2021)
ⓘ Petersburgskoe hydrothermal field	[Opal] Gablina et al. (2017)
ⓘ Pobeda-1 hydrothermal field	[Opal] Gablina et al. (2018) +1 other reference
ⓘ Pobeda-2 hydrothermal field	[Opal] Gablina et al. (2018)
Rainbow Massif ⓘ Rainbow hydrothermal field	[Opal] Bortnikov et al. (2001)
ⓘ Semenov region	[Opal] Melekestseva et al. (2014)
ⓘ Semyenov-1 Hydrothermal Field	[Opal] Safina et al. (2016)
ⓘ Semyenov-2 Hydrothermal Field	[Opal, Opal var: Opal-A] Melekestseva et al. (2017) +2 other references
Sierra Leone fracture zone Markov Deep ⓘ Northeastern rim	[Opal] Sharkov et al. (2007)
ⓘ Snake Pit hydrothermal field	[Opal] S. M. Sudarikov and S. V. Galkin ... +1 other reference
ⓘ Moose Mound	[Opal] Fouquet Y et al. (1993)
Trans-Atlantic Geotraverse hydrothermal field (TAG) ⓘ TAG mound	[Opal] Petersen et al. (2000)
ⓘ Zenith–Victoria hydrothermal field	[Opal] Gablina et al. (2017)
Southern Mid-Atlantic Ridge complex 26°S hydrothermal field ⓘ Xunmei hydrothermal site	[Opal] Yang et al. (2022)
ⓘ Tongguan hydrothermal field	[Opal] Li et al. (2025)

Australia
Australian Capital Territory Paddy's River District ⓘ Paddy's River Mine	[Opal, Opal-AN] McQueen +2 other references
New South Wales Ashburnham Co. Gumble ⓘ Gumble Mine	[Opal, Opal var: Opaline] Mulholland (1984)
Bathurst Co. Carcoar ⓘ Carcoar Mine (Carcoar cobalt mine; Wilsons mine; Wilsons quarry)	[Opal] Liversidge (1888)
Beresford Co. Snowy Mountains district ⓘ Cooma metamorphic Complex	[Opal] John Whitehouse (2015)
Brisbane Co. ⓘ Bunnan	[Opal, Opal-AN] Collection of RJ Martin correlated to ...
Buccleuch Co. Coolac district ⓘ Mount Mary Mine	[Opal, Opal-AN] Graham et al. (2001)
Burnett Co. ⓘ Mount Cora	[Opal, Opal-AN, Opal-AN var: Hyalite] Curtis et al. (2019)
Camden County ⓘ Bundanoon	[Opal] Wray (2001)
Canbelego Co. Miandetta ⓘ Lynch and party (Miandetta deposit)	[Opal, Opal var: Opaline] Gilligan et al. (1995)
Cumberland County Prospect Prospect Hill ⓘ Prospect Quarry	[Opal] Tschernich (1992) +1 other reference
Darling Co. Barraba ⓘ Woodsreef Mine (Wood's Reef Mine; Woodsreef Asbestos Mine; Wood'sreef asbestos deposit)	[Opal] Oskierski et al. (2013)
Finch Co. Collarenebri ⓘ Collarenebri opal field	[Opal]
Cumborah ⓘ Cumborah opal field	[Opal]
ⓘ Lightning Ridge	[Opal, Opal var: Fire Opal, Opal var: Jelly Opal, Opal var: Precious Opal, Opal-A var: Opal-AG, Precious Opal var: Black Opal, Precious Opal var: Boulder Opal, Precious Opal var: Crystal Opal, Precious Opal var: Harlequin Opal, Precious Opal var: Red Flash Opal] Markham et al. (1974) +3 other references
ⓘ Coocoran Opal Fields	[Opal, Opal var: Bone Opal, Opal var: Honey Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal, Precious Opal var: Harlequin Opal] Cram (2004)
ⓘ Cheryl's rush (Kellie's 4 rush)	[Opal] Cram (2004)
ⓘ Cody's rush	[Opal] Cram (2004)
ⓘ Dead Bird rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Emu's rush	[Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Granny's Flat rush	[Opal] Cram (2004)
ⓘ Greenacres rush	[Opal] Cram (2004)
ⓘ Hard Hill rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ K.K. Opal Field	[Opal] aracic
ⓘ Kellie's 1 rush	[Opal] Cram (2004)
ⓘ Ken's Retreat rush	[Opal, Opal var: Bone Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Kevin's rush	[Opal] Cram (2004)
ⓘ Molyneux's rush	[Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Muttabun (Brown's rush)	[Opal] aracic
ⓘ Natalie's Dream Rush (Natalie's Dream 1)	[Opal] Cram (2004)
ⓘ New Coocoran rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Aracic (1999)
ⓘ Norway rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Old Coocoran rush (Coocoran A)	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Olga's rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Ormie's Luck rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Smith's rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Steen's rush (Coocoran C)	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ T-Bone rush	[Opal] Cram (2004)
ⓘ The Nest rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ The Rocks rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Three Trees rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Glengarry Opal Field	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] aracic +1 other reference
ⓘ Grawin Opal Field	[Opal] aracic
ⓘ Three Mile	[Opal, Opal var: Honey Opal, Opal var: Potch] Keith Compton collection
ⓘ Chambers of the Black Hand	[Opal, Opal-A var: Opal-AG, Precious Opal var: Black Opal] Yash Redkar Mine Guided Tour +1 other reference
ⓘ Lunatic Hill	[Opal] Redkar (2025)
ⓘ Walk In Mine	[Opal] www.walkinmine.com.au (n.d.)
ⓘ Wyoming Opal Fields	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] aracic +2 other references
ⓘ Bee Eater rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Francstone 1 rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Francstone 3 rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Great Eastern rush	[Opal, Opal var: Bone Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Ironbark rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Les's 8 Mile rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Snake Gully rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Cram (2004)
ⓘ Wyoming rush	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Smith (1999)
ⓘ Sheepyard Opal Field	[Opal] aracic
Georgiana Co. ⓘ Rocky Bridge Creek	[Opal, Opal var: Precious Opal] W. Curran (1896)
Macquarie Co. Port Macquarie ⓘ Comboyne Volcanic Province	[Opal]
Narran Co. ⓘ Angledool	[Opal] Caucia et al. (2013)
ⓘ Mehi Opal Fields	[Opal, Opal var: Precious Opal] Refs. Cram (2004)
Mehi ⓘ Mehi Opal Field	[Opal] aracic
Pottinger Co. ⓘ Boggabri	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
ⓘ Mullaley	[Opal, Opal-AN, Opal-AN var: Hyalite] specimen in collection
Rous Co. Ballina Shelly Beach ⓘ Black Head (PWD Black Head quarry)	[Opal, Opal-AN var: Hyalite] Collection of RJ Martin
ⓘ Minyon Falls	[Opal, Opal var: Honey Opal] Joel Williams Collection
Teven ⓘ Hitchcocks opal claim ?	[Opal] Brown et al. (2001)
ⓘ Houghlahan's Creek opal field	[Opal] Mumme I.A. and Ball R.A. On the Genesis ...
ⓘ Shepherds opal claim	[Opal] Brown et al. (2001)
ⓘ Snow Queen Mine (Tintenbar Diatomite mine)	[Opal] Henley et al. (2001)
ⓘ Tintenbar volcanics district	[Opal]
Tintenbar ⓘ Tintenbar opal deposit (Morris's claim)	[Opal, Opal var: Precious Opal] Henley et al. (2001) +1 other reference
Tweed Heads ⓘ Point Danger	[Opal] Brown et al. (2001)
Wyrallah ⓘ Wyrallah diatomite deposit ?	[Opal] Brown et al. (2001)
St Vincent Co. ⓘ Bendalong	[Opal] Sorrell (n.d.)
Ulladulla ⓘ Mollymook	[Opal]
ⓘ Warrumbungles (Warrumbungle Range; Warrumbungle Mountain Range)	[Opal, Opal-AN] Jensen (1912)
Wentworth Co. Wentworth Kulcurna Station ⓘ Salt Creek	[Opal] Gill (1973)
Nampoo Station ⓘ Devil's Elbow (Sharp Point)	[Opal] Segnit (1973)
Yancowinna Co. Broken Hill district ⓘ Broken Hill	[Opal]
Broken Hill South Mine (BHS Mine; South Mine) ⓘ Kintore opencut	[Opal, Opal-AN] Birch et al. (1997)
ⓘ Daydream Mine (Meech's Blow)	[Opal, Opal-AN] The Daydream Mine
ⓘ New Year Mine	[Opal, Opal var: Opal-CT] Rod Martin Collection
Yungnulgra Co. Gemville ⓘ Gemville Opal Field	[Opal] Aracic (1999)
ⓘ White Cliffs	[Opal, Opal var: Jelly Opal, Opal var: Pineapple Opal, Opal var: Precious Opal, Precious Opal var: Mother of Opal, Precious Opal var: White Opal] Mason (1976) +1 other reference
Northern Territory Barkly Region Wauchope Mosquito Creek Wolfram Field ⓘ Mosquito Creek Opal Deposit	[Opal] Benger (1990)
Central Desert Region ⓘ Harts Range (Harts Ranges; Hartz Range; Hartz Ranges)	[Opal]
Victoria-Daly Region ⓘ Bullita Cave system	[Opal, Opal-AN] Martini et al. (2012)
ⓘ Queensland	[Opal, Precious Opal var: Boulder Opal, Precious Opal var: Opal Matrix]
Barcoo Shire ⓘ Barcoo River	[Opal] Natural History Museum
ⓘ Jundah opal field	[Opal] en.wikipedia.org (n.d.)
ⓘ Opalville opal mine	[Opal] en.wikipedia.org (n.d.)
Blackall-Tambo Region ⓘ Listowel Downs	[Opal, Opal var: Precious Opal] Rocks & Min.: 8:15.
Burke Shire Burketown ⓘ Nicholson River	[Opal, Opal-AN]
Lawn Hill ⓘ Union Jack mine	[Opal, Opal-AN] Con Constantinides collection
City of Mount Isa Gunpowder District Mount Gordon ⓘ Esperanza Z5 Mine (Esperanza deposit)	[Opal] Richardson et al. (1997)
Mount Isa Mount Isa Mines ⓘ Black Star open cut (Black Star pit; Black Star lode)	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
Cloncurry Shire Cloncurry ⓘ Milo Mine	[Opal, Opal-AN var: Hyalite] Derrick
ⓘ Monakoff Mine	[Opal, Opal-AN] Graham Lee Collection
Kuridala ⓘ Silver Spur	[Opal, Opal-AN var: Hyalite] Con Constantinides collection
Rosebud Station Mary Kathleen district ⓘ Hardway Mine	[Opal, Opal-AN] Personal collection and shown on photo
Selwyn District ⓘ Ella Mine (Lady Ella Mine)	[Opal, Opal-AN var: Hyalite] Costas Constantinides
Cook Shire Cape York Peninsula ⓘ Cape Weymouth	[Amber] Jeffrey de Fourestier collection: ...
Gold Coast City Shire Coolangatta ⓘ Point Danger	[Opal] MacNevin A.A. & Holmes G.G. (1980)
ⓘ Currumbin	[Opal] Hall (1988)
Mareeba Shire ⓘ Anastasia Au deposit	[Opal, Opal var: Opaline] Nethery et al. (1998)
McKinlay Shire McKinlay ⓘ Cannington Mine	[Opal]
Paroo Shire ⓘ Koroit opal field	[Opal, Opal var: Precious Opal, Precious Opal var: Boulder Opal, Precious Opal var: Opal Matrix]
ⓘ Yowah opal field	[Opal, Boulder Opal var: Yowah Nut, Opal var: Pipe Opal, Opal var: Precious Opal, Precious Opal var: Boulder Opal, Precious Opal var: Crystal Opal, Precious Opal var: Opal Matrix, Precious Opal var: Pinfire Opal] Höbelt (1990)
Quilpie Shire ⓘ Eromanga	[Opal, Opal var: Precious Opal, Precious Opal var: Boulder Opal] Martins da Pedra collection +1 other reference
ⓘ Aladdin mine	[Opal, Opal var: Precious Opal] Rocks & Min.:8:4.
ⓘ Hayricks Mine	[Opal] Pecover (2007)
Keeroongooloo station ⓘ Friday Mine	[Opal] Rocks & Min.:8:15.
ⓘ Quilpie	[Opal, Precious Opal var: Boulder Opal]
Sunshine Coast Region Glasshouse Mountains Province ⓘ Maleny Volcanic Field	[Opal]
Western Downs Region Dalby Kaimkillenbun ⓘ Squaretop Mountain (Black top hill)	[Opal, Opal-AN, Opal var: Hydrophane]
Winton Shire ⓘ Opalton	[Opal, Opal var: Pipe Opal, Precious Opal var: Boulder Opal]
ⓘ Winton	[Opal, Precious Opal var: Boulder Opal] Lavinsky (n.d.)
South Australia Aṉangu Pitjantjatjara Yankunytjatjara (APY; APY Lands) Mintabie ⓘ Mintabie opal field (Old field)	[Opal, Opal var: Fire Opal, Opal var: Milk Opal, Opal var: Pipe Opal, Opal var: Precious Opal, Precious Opal var: Black Opal, Precious Opal var: Crystal Opal, Precious Opal var: Pinfire Opal, Precious Opal var: White Opal] Liesegang et al. (2018)
Barossa Council Angaston ⓘ Angas Property	[Opal] Brown (1908)
ⓘ Crinnis Copper Mine	[Opal] Record of Mines - Mine Summary Card ...
Mount Crawford Mount Crawford Forest Reserve ⓘ Sailors Gully	[Opal, Opal var: Common Opal] Brown (1908)
City of Onkaparinga ⓘ Hackham	[Opal]
District Council of Cleve ⓘ Darke Peak	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
District Council of Tumby Bay ⓘ Tumby Bay	[Opal] Ben Grguric
Goyder Regional Council Burra ⓘ Burra Burra Copper Mine	[Opal] Pring et al. (1994)
Mid Murray Council ⓘ Truro	[Opal]
Northern Areas Council Spalding ⓘ Bundaleer area	[Opal, Opal-AN] Personal Collection of M. Willoughby.
ⓘ Ouldburra Hill	[Opal, Precious Opal var: Black Opal] Barnes et al. (1992)
ⓘ Longins Bank diggings	[Opal] Barnes et al. (1992)
ⓘ Sarda Bluff	[Opal] Barnes et al. (1992) +1 other reference
Pastoral Unincorporated Area Andamooka Station ⓘ Andamooka opal fields	[Opal, Opal var: Pineapple Opal, Opal var: Precious Opal, Precious Opal var: Black Opal, Precious Opal var: Mother of Opal, Precious Opal var: Opal Matrix, Precious Opal var: Pinfire Opal, Precious Opal var: White Opal]
ⓘ German Gully	[Opal]
ⓘ Hard Hill opal field	[Opal] Barnes et al. (1992)
ⓘ Horse Paddock diggings	[Opal] Barnes et al. (1992)
ⓘ Treloars opal field	[Opal] Barnes et al. (1992)
ⓘ Arkaroola (Arkaroola Wilderness Sanctuary; Arkaroola Station)	[Opal, Opal-AN] Sorrell (n.d.) +1 other reference
Mount Painter area ⓘ Mount Painter No. 2 workings	[Opal, Opal-AN] Brugger et al. (2003)
ⓘ Mt Gee	[Opal, Opal-AN]
ⓘ Paralana Hot Springs	[Opal, Opal var: Opaline] Brugger et al. (2005)
Boolcoomatta Reserve (Boolcoomata Station) ⓘ Dome Rock Copper Mine	[Opal, Opal-AN]
ⓘ Broken Leg Waterhole	[Opal] Barnes et al. (1992) +1 other reference
ⓘ Coober Pedy	[Opal, Opal var: Common Opal, Opal var: Jelly Opal, Opal var: Milk Opal, Opal var: Precious Opal, Opal var: Shell Opal, Precious Opal var: Crystal Opal, Precious Opal var: Harlequin Opal, Precious Opal var: Pinfire Opal, Precious Opal var: White Opal] Locality description +2 other references
ⓘ Breakaways	[Opal, Opal var: Precious Opal] Barnes et al. (1992)
ⓘ Dead Horse Gully Field	[Opal] Barnes et al. (1992)
ⓘ Donnas Rush	[Opal, Opal var: Precious Opal] Barnes et al. (1992)
ⓘ Seventeen Mile field	[Opal] Barnes et al. (1992)
Gammon Ranges Vulkathunha-Gammon Ranges National Park ⓘ O'Donoghue's Castle Mine (O'Donohue's Castle Mine)	[Opal, Opal-AN] Pers. Comm. M. Willoughby. Found on ...
Iron Knob ⓘ Iron Monarch Main Pit	[Opal, Opal-AN] Francis (2010)
ⓘ Lambina opal field	[Opal] Barnes et al. (1992)
ⓘ Marree	[Opal]
Mobella Station ⓘ Challenger mine	[Opal] Lintern et al. (1999)
Mount Freeling Mount Fitton homestead ⓘ Pinnacles Mine	[Opal, Opal-AN] Collection of RJ Martin
Mount Victor Plumbago Station ⓘ Ethiudna Mines	[Opal, Opal-AN] J Bosworth
Mulgaria ⓘ Stuart Creek Opal Diggings	[Opal, Opal var: Opal-C, Opal var: Opal-CT, Opal-CT var: Lussatite, Precious Opal var: Opal Matrix, Precious Opal var: White Opal] Thiry et al. (1991)
ⓘ Vesuvius diggings	[Opal] Barnes et al. (1992)
ⓘ Wellbourn Hill	[Opal] Barnes et al. (1992) +1 other reference
Witchelina Nature Reserve (Witchelina) ⓘ Dunns Deposit (Willouran Mine)	[Opal, Opal-AN] Collection of M.Willoughby.
Tasmania Brighton municipality Bridgewater ⓘ Boral Quarry	[Opal] Ralph S Bottrill Collection
Central Highlands municipality Interlaken ⓘ Dog's Head Tier	[Opal, Opal-AN] Mathew Latham collection
Circular Head municipality Cape Grim district ⓘ Trefoil Island	[Opal] Sutherland et al. (1967) +1 other reference
Marrawah district Redpa ⓘ Redpa quarry	[Opal] www.crocoite.com (2003)
Clarence City Risdon ⓘ Shag Bay	[Opal]
Derwent Valley municipality ⓘ Rosegarland	[Opal] R Bottrill
Devonport City municipality Devonport district ⓘ Don Hill	[Opal, Opal-AN] www.crocoite.com (2003)
Hobart city ⓘ Lower Sandy Bay	[Opal]
Mt Nelson ⓘ Mt Nelson quarry	[Opal] Bottrill et al. (2008)
Huon Valley municipality Huon-Channel region ⓘ Cygnet district	[Opal] Taheri
Weld river district ⓘ Forster Prospect	[Opal] Bottrill et al. (2008)
Southern Islands ⓘ Pedra Branca	[Opal] Bottrill et al. (2008)
Northern Midlands municipality Avoca-Royal George mining district ⓘ Benham plains	[Opal, Opal-AN] Mathew Latham collection
Tasman Municipality ⓘ Lime Bay	[Opal, Opal-AN var: Hyalite] R Bottrill collection
Waratah-Wynyard municipality Waratah district Waratah-Mt Bischoff ⓘ Mount Bischoff Mine	[Opal] Bottrill +1 other reference
West Coast municipality Trial Harbour district ⓘ Heemskirk Falls prospect	[Opal] R. Bottrill +1 other reference
Victoria Campaspe Shire Corop ⓘ Lake Cooper quarry	[Opal, Opal-AN] crocoite.com
City of Ballarat ⓘ Alfredton	[Opal, Opal-AN] Sorrell (n.d.)
Miners Rest ⓘ Miners Rest Quarry	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
ⓘ Sebastopol	[Opal, Opal-AN] Toby Billing collection
City of Casey Berwick ⓘ Bayview Quarry (Bayview quarries; Berwick Bluestone Quarry)	[Opal]
City of Greater Geelong Anakie ⓘ Mount Anakie	[Opal, Opal-AN] Museum Victoria Mineralogy Collection
ⓘ Eastern Hill	[Opal, Opal-AN] Museum Victoria Mineralogy Collection
City of Hume ⓘ Sunbury	[Opal, Opal-AN] Judy Rowe collection
ⓘ Emu Creek	[Opal]
City of Latrobe ⓘ Yinnar	[Opal, Opal var: Opal-CT] Curtis +3 other references
ⓘ Stony Creek	[Opal]
City of Whittlesea Bundoora ⓘ Boral Limited quarry	[Opal, Opal-AN]
City of Yarra Collingwood Clifton Hill ⓘ Corporation quarries	[Opal, Opal-AN] Birch (1989)
Colac Otway Shire Colac ⓘ Riordan's Quarry	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
ⓘ Cororooke	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
Ondit ⓘ Colac Quarry	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
Corangamite Shire Skipton Mount Widderin ⓘ Skipton Caves	[Opal] Webb et al. (1982)
Golden Plains Shire Lethbridge ⓘ Lethbridge quarry	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
Hepburn Shire Creswick ⓘ Allendale	[Amber] Kirejtshuk et al. (2008)
ⓘ Glengower	[Opal]
ⓘ Trentham	[Opal, Opal-AN] Sorrell (n.d.)
ⓘ Trentham Falls	[Opal, Opal-AN] Hollis (1979)
Loddon Shire Brenanah Mount Kooyoora ⓘ White Swan pegmatite mine	[Opal, Opal-AN] Ryan Eagle field collected 2018
ⓘ Mount Hope	[Opal, Opal-AN] Ryan Eagle personal observation 2016
Macedon Ranges ⓘ Spring Hill	[Opal, Opal-AN] Judy Rowe collection
Macedon Ranges Shire ⓘ Malmsbury	[Opal] Alan Goldstein colln.
ⓘ Malmsbury Quarry	[Opal, Opal-AN] specimen in collection
ⓘ Rollinsons quarry	[Opal, Opal-AN] ex Joan Lamond Collection
ⓘ Riddells Creek	[Opal, Opal var: Opal-CT]
Mansfield Shire Mansfield ⓘ Phosphate Hill	[Opal, Opal-AN] Birch et al. (1993)
Pyrenees Shire Avoca Lillicur ⓘ Diatomite deposit	[Opal]
Rural City of Wangaratta ⓘ Glenrowan	[Opal, Opal-AN] Sorrell (n.d.)
Greta South ⓘ Greta South turquoise field	[Opal, Opal-AN] Birch et al. (1993)
Southern Grampians Shire ⓘ Glenthompson	[Opal, Opal-AN] Jon Mommers collection.
Surf Coast Shire ⓘ Armytage Quarry	[Opal, Opal-AN var: Hyalite] Sorrell (n.d.)
Swan Hill Rural City Lake Boga ⓘ Lake Boga granite quarry	[Opal, Opal-AN] Sorrell (n.d.) +1 other reference
Towong Shire Dartmouth Morass Creek gorge ⓘ Wombat Hole prospect (Wombat Hole mine)	[Opal, Opal-AN] Sorrell (n.d.)
Yarra Ranges Shire Lilydale ⓘ Cave Hill Quarry (David Mitchell Limestone Quarry; Lilydale Quarry)	[Opal, Opal-AN] Sorrell (n.d.)
ⓘ Western Australia	[Opal]
Carnarvon Shire ⓘ Gascoyne River	[Opal, Opal var: Opal-CT] Carr et al. (2021)
City of Karratha ⓘ Peawah gold prospect	[Opal] Simpson (1952)
Coolgardie Shire Binneringie Station ⓘ Binneringie opal deposit	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Coolgardie Grosmont district ⓘ Grosmont Mica Mine	[Opal, Opal var: Common Opal] Jacobson. (2007)
ⓘ Williams Opal Mine (Three Mile Hill Mine)	[Opal, Opal var: Precious Opal] Fetherston et al. (2013)
ⓘ Dandaragan Shire	[Opal] Geology of the Northern Perth Basin +3 other references
Cervantes ⓘ Lake Thetis	[Opal] Geology of the Northern Perth Basin- a ... +4 other references
Dandaragan ⓘ Minyulo Well	[Opal, Opal-AN var: Hyalite] Steve Sorrell Collection
Dundas Shire ⓘ Norseman	[Opal] Kim McDonald collection
ⓘ Norseman opal mine	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
East Pilbara Shire Braeside lead field ⓘ Ragged Hills Mine	[Opal] Simpson Mineral Collection of the ... +4 other references
Nullagine ⓘ Lionel chrysotile deposit	[Opal, Opal var: Cat's Eye Opal] Simpson (1948)
Weeli Wolli Creek Area Mining Area C ⓘ Area C mine	[Opal, Opal-AN] BHP
Gingin Shire ⓘ Gingin (Molecap Hill; Poison Hill; MacInytre Gully)	[Opal] On Gearkstite at Gingin
Goomalling Shire ⓘ Thomas and Truscotts mine	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Kalgoorlie-Boulder Shire Black Flag Goldfield Grant's Patch ⓘ Black Flag Road opalite area	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
ⓘ Grants Patch opalite area	[Opal, Opal var: Common Opal, Opal var: Moss Opal] Fetherston et al. (2013)
Mount Pleasant ⓘ Lady Bountiful Extended Gold Mine	[Opal, Opal var: Opaline] De Broekert (2003)
Bulong Goldfield ⓘ Bulong Area magnesite deposits	[Opal, Opal var: Common Opal] Feldtmann (1919)
ⓘ Bulong Ni Mine	[Opal, Opal var: Common Opal] Kim McDonald collection
ⓘ Bulong opal deposits	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
ⓘ Taurus chrysoprase deposit	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Cowarna Downs Station ⓘ Cowarna opal mine	[Opal, Opal var: Common Opal, Opal var: Precious Opal] Fetherston et al. (2013)
Mount Monger Goldfield ⓘ Mount Monger	[Opal, Opal var: Opaline] Kalgoorlie Miner newspaper (1920)
Laverton Shire Erilstoun Goldfield ⓘ Baneygo Gold Mine	[Opal] Simpson (1948)
ⓘ Murrin Murrin Ni-Co Mine (Anaconda Nickel mine)	[Opal, Opal var: Common Opal] mrdate.usgs.gov (n.d.)
White Cliffs Station ⓘ Unnamed opal deposit	[Opal] Pardieu (2011)
ⓘ White Cliffs fire opal deposits	[Opal, Opal var: Fire Opal] Simpson (1948)
Leonora Shire Leinster ⓘ Goanna Patch Mining area	[Opal] Grguric (2009)
Lake Miranda ⓘ Cam's Mine	[Opal] Ben Grguric
Meekatharra Shire Bulloo Downs Station ⓘ Koode Magi prospect	[Opal, Opal var: Opaline] Marston (1979)
Milgun Station ⓘ Mount Deverell variscite deposit	[Opal] Peter Downes
Mount Gould Station ⓘ Mount Seabrook Talc Mine	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Mount Padbury Station ⓘ Discovery U Quarries	[Opal, Opal var: Opaline] www.fairstarresources.com (n.d.)
Sylvania Station ⓘ Coobina Chromite Mine (Jimblebah; Jimblebar; Murramunda)	[Opal] Grguric et al. (2011)
Menzies Shire ⓘ Comet Vale	[Opal, Opal var: Common Opal] Grguric et al. (2006)
ⓘ Blue Speck Creek	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Davyhurst Goldfield Callion ⓘ Glasson Gold Mine (BC Pit)	[Opal, Opal var: Opaline] Llorca (1998)
Diemals Station ⓘ Evanston Gold Mine	[Opal] Simpson (1948)
Mount Magnet Shire Mount Magnet East Magnet Goldfield ⓘ Primrose Gold Mine	[Opal, Opal var: Opaline] The Inquirer and Commercial News newspaper (Perth)
Lennonville Goldfield ⓘ Welcome Gold Mine	[Opal, Opal var: Opaline] The Inquirer and Commercial News newspaper (Perth)
Murchison Shire Byro Station ⓘ Bulgarro opal mine (Bulgaroo opal mine)	[Opal] Fetherston et al. (2013)
ⓘ Iniagi Well (Imagi Well Mine)	[Opal] Fetherston et al. (2013)
ⓘ Meegea	[Opal] Fetherston et al. (2013)
Nookawarra Station ⓘ Mount Taylor 1 prospect	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Northam Shire Northam ⓘ Mount Dick	[Opal, Opal-AN] Fetherston et al. (2013)
Northampton Shire ⓘ Northampton	[Opal] Downes et al. (2017)
Perenjori Shire Karara Conservation Reserve ⓘ Rothsay beryl pegmatites (Seleka; Perenjori Beryl Mine)	[Opal, Opal-AN] Jacobson et al. (2007)
ⓘ Rothsay Mine (Woodley's Find)	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
Weelhamby Lake ⓘ Ninghanboun Hills	[Opal, Opal var: Common Opal] Fetherston et al. (2013)
ⓘ Ninghanboun Hills serpentinite	[Opal] Simpson (1932) +1 other reference
Sandstone Shire Youangarra Goldfield (Curran's Find) ⓘ Penny West Gold Mine	[Opal] Jorgensen et al. (2017)
Upper Gascoyne Shire ⓘ Mooloo Downs Station	[Opal, Opal var: Opaline] R.M. Clarke and I.R. Williams +2 other references
ⓘ Moolooite location	[Opal, Opal var: Opaline] Clarke et al. (1986)
Mount Phillip Station (Mount Phillips Station) ⓘ Mount Phillips Amethyst Mine (Gascoyne Amethyst Mine; Soklich Amethyst Mine)	[Opal] Kim Macdonald
Yinnietharra ⓘ Tomkap tourmaline mines (Soklich)	[Opal]
ⓘ Yinnietharra Dravite mine (South Open Cut)	[Opal] Bridge et al. (1977)
ⓘ Yinnietharra Dravite North mine	[Opal] Fetherston et al. (2013)
Westonia Shire Westonia ⓘ Edna May Gold Mine	[Opal] Simpson et al. (1948)
Wiluna Shire Wiluna Wiluna Mining Project ⓘ Bulletin Mine	[Opal] Simpson (1948)
Yalgoo Shire Minjar Gold District ⓘ Golden Monarch (Monarch; Mug's Blow; Mug's Luck)	[Opal] Simpson (1948)
Paynes Find ⓘ Mount Edon	[Opal, Opal-AN] Pegamtites of Western Australia +2 other references
Yilgarn Shire Bullfinch ⓘ Copperhead Gold Mine	[Opal] Simpson (1948)
ⓘ Mount Jackson Goldfield	[Opal, Opal var: Common Opal] Simpson (1948)
Parker Range Goldfield ⓘ Mount Caudan iron ore and gold prospect	[Opal] Simpson (1948)
Southern Cross ⓘ Maori Lass Gold Mine	[Opal, Opal var: Opaline] The Southern Cross Times newspaper (1913)
Yellowdine ⓘ Mount Palmer Gold Mine (Palmer's Find)	[Opal] Simpson (1948)

Austria
Burgenland Oberpullendorf District Markt Sankt Martin Pauliberg ⓘ Basalt quarry	[Opal, Opal-AN] Schebesta (1983) +2 other references
Oberwart District Badersdorf ⓘ Holler quarry	[Opal, Opal-AN] - (n.d.) +2 other references
ⓘ Unnamed quarry	[Opal, Opal-AN] Tuma (1991)
Bernstein ⓘ Pechgraben	[Opal] Exel (1993)
ⓘ Kohfidisch	[Opal, Opal-AN var: Hyalite] Exel (1993)
ⓘ Csaterberge (Csater-Berge)	[Opal] Kümel (1957)
ⓘ Opal occurrence	[Opal] Kümel (1957)
Carinthia Klagenfurt am Wörthersee Ehrentaler Berg ⓘ A2 Highway tunnel	[Opal] Niedermayr et al. (1994)
Wölfnitz ⓘ A2 Highway tunnel (Falkenberg tunnel)	[Opal, Opal-AN] Niedermayr et al. (1995)
Sankt Veit an der Glan District Flattnitz ⓘ Haidnerhöhe	[Opal, Opal-AN] Niedermayr et al. (1995)
Guttaring ⓘ Sonnberg	[Amber, Amber var: Rosthornite] Niedermayr et al. (1995)
Hüttenberg ⓘ Hüttenberger Erzberg	[Opal var: Cacholong] Seeland (1876)
ⓘ Gossen section	[Opal] Meixner (1950)
Klein Sankt Paul ⓘ Sittenberg	[Amber] Niedermayr et al. (1995)
Spittal an der Drau District Millstatt Millstätter Alpe ⓘ Magnesite Mine	[Opal] Pichler (2009)
Villach-Land District Fresach Laas ⓘ Feldspar quarry	[Opal, Opal-AN] Niedermayr et al. (1995)
Villach Zauchen ⓘ Kumberg (Komberg)	[Opal] Meixner (1981)
Wolfsberg District Bad Sankt Leonhard im Lavanttal Mica Mines ⓘ Peter Mine	[Opal, Opal-AN] Meixner (1952) +1 other reference
Frantschach-Sankt Gertraud Brandrücken ⓘ Spodumene prospect	[Opal, Opal-AN]
Fraßgraben ⓘ Fraßgraben quarry (Gall quarry; Modre quarry)	[Opal] Niedermayr et al. (1995)
Sankt Andrä Großer Speikkogel ⓘ Schloß Alp (Relais station)	[Opal] Weissensteiner (1970)
Sankt Paul im Lavanttal Kollnitz ⓘ Basalt quarry	[Opal] Niedermayr et al. (1995)
Wolfsberg Sankt Stefan ⓘ Lignite deposit	[Amber, Amber var: Jaulingite] Niedermayr et al. (1995)
Lower Austria Baden District Enzesfeld-Lindabrunn ⓘ Jauling lignite deposit	[Amber, Amber var: Jaulingite] V. R. v. Zepharovich: Sitzungsber. kais. Akad. Wiss. Wien 16:366 (1855)
Bruck an der Leitha District Hainburg an der Donau Pfaffenberg hill ⓘ Hollitzer quarry	[Opal] Niedermayr et al. (1974)
Hollabrunn District Maissau Oberdürnbach ⓘ Diatomite pit	[Opal] Götzinger et al. (1994)
Pulkau Leodagger ⓘ Granite quarry	[Opal, Opal-AN] C.Auer (2018)
Ravelsbach Parisdorf ⓘ Diatomite pit	[Opal] Götzinger et al. (1994)
ⓘ Parisdorf pit	[Opal] Götzinger et al. (1994)
Horn District Brunn an der Wild Atzelsdorf ⓘ Marble quarry	[Opal, Opal var: Opal-CT] Pristacz et al. (2011)
Dietmannsdorf an der Wild ⓘ Serpentinite quarries	[Opal, Opal var: Honey Opal] Knobloch et al. (2022) +1 other reference
ⓘ Fürwald	[Opal] www.kristall-werkstatt.at (2021)
Drosendorf-Zissersdorf Pingendorf ⓘ Serpentinite quarry	[Opal] Niedermayr (1990)
ⓘ Wolfsbach	[Opal] Niedermayr (1986)
ⓘ Zissersdorf	[Opal] Albert Prayer collection
Gars am Kamp ⓘ Wanzenau	[Opal] Exel (1993)
Geras Kottaun ⓘ Unnamed quarry ("Andradite quarry")	[Opal, Opal-AN] Kolitsch et al. (2013)
ⓘ Japons	[Opal] Exel (1993)
Langau ⓘ Chalcedony occurrence	[Opal] Kolitsch (2021)
Röhrenbach Winkl ⓘ Marble quarries (incl. Renz Quarry; Bundesheer Quarry)	[Opal] Kolitsch et al. (2011)
Krems-Land District Albrechtsberg an der Großen Krems ⓘ Klein-Heinrichschlag	[Opal] Fechner et al. (1985)
Krumau am Kamp Tiefenbach ⓘ Kyanite occurrence	[Opal] Riedel (2008)
Maria Laach am Jauerling Felbring ⓘ Siebenhandl quarry (Kraxnerklippe)	[Opal] Erwin Löffler collection
Zintring ⓘ Seebichl	[Opal, Opal-AN] Harald Schillhammer collection
Mühldorf ⓘ Amstall	[Opal, Opal-AN] Neschen (n.d.)
ⓘ Graphite quarry	[Opal, Opal-AN] Neschen (n.d.)
ⓘ Marble quarry (Thalinger quarry; Hausbruch)	[Opal, Opal-AN] Neschen (n.d.)
ⓘ Road cut	[Opal, Opal-AN] Neschen (n.d.)
ⓘ Weinberg Middle	[Opal] Goldmann et al. (2008)
ⓘ Trandorf	[Opal, Opal var: Milk Opal, Opal-AN var: Hyalite] - (n.d.)
Paudorf Meidling ⓘ Granulite quarry (Asamer quarry; Wanko gravel works)	[Opal, Opal-AN] Kolitsch et al. (2023)
Sankt Leonhard am Hornerwald Dürrenberg (Dürnberg) ⓘ Milk opal occurrence	[Opal, Opal var: Milk Opal] Exel (1993)
ⓘ Serpentinite outcrops	[Opal] Exel (1993)
Schönberg am Kamp Plank am Kamp ⓘ Calcsilicate occurrence	[Opal] Erwin Löffler collection
Melk District Persenbeug-Gottsdorf Loja ⓘ Quarry II	[Opal] Löffler et al. (2011)
Raxendorf Feistritz ⓘ Graphite mine	[Opal] Holzer et al. (1963)
Sankt Oswald ⓘ "In der Gleisen" quarry (Yspertal; Ispertal; Unterfell)	[Opal] Götzinger (1987)
Mödling District Perchtoldsdorf ⓘ Endlwehr quarry	[Amber] Wessely (1908)
Sankt Pölten-Land District Hafnerbach Hengstberg ⓘ Graphite deposit	[Opal] Kolitsch et al. (2015)
Karlstetten ⓘ Obermamau chalcedony occurrence	[Opal] HAMMER & ĆORIĆ (2007)
Rosenthal ⓘ Marchart quarry	[Opal] Götzinger (2008)
ⓘ Wilhelmsburg	[Amber] Exel (1993)
Waidhofen an der Thaya District Dobersberg ⓘ Dobersberg	[Opal] Weiss (1960)
Raabs an der Thaya Eibenstein an der Thaya ⓘ Hengl quarry	[Opal, Opal-AN] Harald Schillhammer collection +1 other reference
ⓘ Gimpelfeld	[Opal, Opal-AN] Kolitsch et al. (2014)
ⓘ Grossau	[Opal] Wolfgang Ecker collection
ⓘ Primmersdorf	[Opal] Exel (1993)
ⓘ Höllgraben	[Opal] - (n.d.) +1 other reference
Waldkirchen an der Thaya ⓘ Waldkirchen an der Thaya	[Opal, Opal var: Milk Opal, Opal var: Moss Opal] Neschen (n.d.) +1 other reference
Zwettl District Kottes-Purk Elsenreith ⓘ Graphite mine	[Opal] Zirkl (1961)
Salzburg Hallein District ⓘ Golling an der Salzach	[Amber] Winkler (2003)
Kuchl ⓘ Carbonatite outcrops	[Amber] Winkler (2003)
Scheffau am Tennengebirge ⓘ Grubach	[Amber] www.ambertop.de (n.d.)
Salzburg-Umgebung District Anthering Anthering - Muntigl area ⓘ Sandstone quarries	[Amber] On exhibit in the Museum "Haus der ...
St. Johann im Pongau District Bad Gastein Böckstein ⓘ Municipal quarry (Dick quarry)	[Opal, Opal-AN] Strasser (1989)
Naßfeld valley Kniebeißgraben ⓘ Unnamed adit	[Opal, Opal-AN] Strasser (1989)
Kreuzkogel massif Radhausberg ⓘ Paris adit	[Opal, Opal-AN] Strasser (1989)
ⓘ Pasel adit	[Opal, Opal-AN] Strasser (1989)
ⓘ Schleierfall tunnel	[Opal, Opal-AN] Strasser (1989)
Siglitz - Bockhart gold mining district ⓘ Bockhart adit	[Opal, Opal-AN] Strasser (1989)
ⓘ Siglitz adit (Imhof-Unterbau adit; Imhof adit)	[Opal, Opal-AN] Strasser (1989)
ⓘ Thermal water spa	[Opal, Opal-AN] Strasser (1989)
Bad Hofgastein ⓘ Schloss Alp ?	[Opal] Kolitsch et al. (2019)
Mühlbach am Hochkönig ⓘ Anna adit	[Opal, Opal-AN] Strasser (1989)
Tamsweg District Lessach ⓘ Bodenmoosgraben talc mine	[Opal] Strasser (1989)
Zell am See District Bramberg am Wildkogel Nasenkopf mountain Leckbachgraben ⓘ Emerald deposit	[Opal, Opal-AN] Strasser (1989)
Mittersill Mittersill Scheelite deposit ⓘ Western ore field	[Opal, Opal-AN] Strasser (1989)
Neukirchen am Großvenediger Abichl Alp - Beryller area ⓘ Beryller	[Opal, Opal-AN] Exel (1993)
Hopffeld area ⓘ Hopffeldboden	[Opal, Opal-AN] Strasser (1989)
Uttendorf Enzingerboden Tauernmoos lake ⓘ Seewände quarry ?	[Opal, Opal-AN] Strasser (1989)
Styria Bruck-Mürzzuschlag District Kapfenberg Tanzenberg ⓘ S6 motorway tunnel (Tanzenberg tunnel)	[Opal] Postl (1985)
Tragöß-Sankt Katharein Oberdorf (Oberdorf an der Laming) Oberdorf magnesite deposit ⓘ Kaintaleck Mine (Kaintalegg Mine; Hohenburg deposit)	[Opal, Opal var: Opal-CT] Gerald Gesselbauer (2010)
ⓘ Wiesergut Mine (Wieser Mine)	[Opal] Gerald Gesselbauer (2010)
Deutschlandsberg District Bad Schwanberg Glashütten ⓘ Fuchskogel	[Opal] - (n.d.)
ⓘ Hartner quarry	[Opal, Opal-AN] Aufschluss 1972 (SB)
ⓘ Rostock creek	[Opal, Opal-AN] Taucher et al. (2001)
Schwarze Sulm ⓘ Müllerbauer	[Opal, Opal-AN] Weissensteiner (1975)
Deutschlandsberg ⓘ Laßnitzgraben	[Opal, Opal-AN] Weninger (1976)
Osterwitz ⓘ Kuppergrund	[Opal, Opal-AN] Exel (1993)
ⓘ Schwagbauer (Schwoagbauer)	[Opal, Opal-AN] Koritnig
ⓘ Stoffhütte pegmatite	[Opal] Postl & Moser (1988)
Eibiswald ⓘ Coal deposit	[Amber, Amber var: Jaulingite, Amber var: Rosthornite] Exel (1993)
Sankt Oswald ob Eibiswald Krumbach ⓘ Polanz quarry (Mauthnereck)	[Opal, Opal-AN] Meixner (1937)
Leibnitz District Oberhaag Lieschengraben ⓘ Aldrian quarry (Hofstatt quarry)	[Opal, Opal-AN] Neschen (n.d.)
Wildon Weitendorf ⓘ Basalt quarry	[Opal, Opal-AN, Opal var: Opal-CT] Aufschluss 1972 (SB)
Leoben District ⓘ Kraubath an der Mur	[Opal] Alker (1972)
Wald am Schoberpass ⓘ Haider quarry	[Opal] Josef Taucher & Christine Elisabeth Hollerer (2012)
Liezen District Landl Gams bei Hieflau ⓘ Sulzbach	[Amber] Neschen (n.d.)
Murau District Teufenbach-Katsch Katsch an der Mur ⓘ Schwarzenberg quarry (Katsch quarry)	[Opal, Opal var: Opal-CT] www.markasit070752.ws24.cc (n.d.)
Murtal District Spielberg Ingering valley ⓘ Holzbrücken mill	[Opal, Opal-AN, Opal var: Forcherite] Neuwirth (1952)
Südoststeiermark District Bad Gleichenberg Klausen ⓘ Schlarbaum quarry	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Milk Opal] Aufschluss 1972 (SB)
Wilhelmsdorf ⓘ Stradner Kogel	[Opal, Opal-AN] Neschen (n.d.)
Feldbach Gossendorf ⓘ Clay pit	[Opal] Exel (1993)
ⓘ Trass pit	[Opal, Opal var: Fire Opal, Opal var: Milk Opal]
Mühldorf bei Feldbach ⓘ Steinberg	[Opal, Opal-AN] Postl et al. (1996)
Klöch ⓘ Basalt quarry	[Opal, Opal-AN, Opal var: Opal-CT] Exel (1993)
Voitsberg District Köflach ⓘ Köflach - Voitsberg lignite deposit	[Amber, Amber var: Jaulingite] Exel (1993)
Maria Lankowitz ⓘ Frei-Gössnitz creek pegmatite outcrops	[Opal, Opal var: Opal-CT] A.Weiß (1972)
Weiz District Rettenegg Prinzkogel (Prinzenkogel) Prinzkogel mines Southern District ⓘ Kaltenegg	[Opal] Jakely (2008)
Tyrol Imst District Mieming ⓘ Lehnbach	[Amber] https://www.mineralienatlas.de/?l=32985 +1 other reference
Innsbruck-Land District Navis ⓘ Navis stream (Navis creek) ?	[Opal] Kolitsch et al. (2019)
Telfs ⓘ Kochen valley	[Amber, Amber var: Kochenite] Pichler (1868)
Kufstein District Kramsach ⓘ Brandenberg	[Amber, Amber var: Kochenite] Exel (1993)
Schwaz District Jenbach ⓘ Pertisau	[Amber, Amber var: Kochenite] Exel (1993)
Upper Austria ⓘ Gmunden District	[Amber] Neschen (n.d.)
Kirchdorf an der Krems District ⓘ Roßleithen	[Amber] J.Schadler et al. (Handschriftliche Aufzeichnungen)
Vorderstoder ⓘ Walchegg	[Amber] H.Commenda
Linz-Land District Enns ⓘ Enns river docks	[Opal, Opal-AN] Neschen (n.d.)
Pucking ⓘ Traun river dam (Traun power plant)	[Opal, Opal-AN] Niedermayr (1987) +2 other references
Rohrbach District Arnreit ⓘ Kicking	[Opal, Opal-AN] Josef Schadler (Handschriftliche Aufzeichnungen)
Schärding District Sankt Florian am Inn Gopperding ⓘ Granite quarry (Eder quarry)	[Opal, Opal-AN] Kolitsch (2008) +1 other reference
Steyr-Land District St. Ulrich bei Steyr ⓘ Farm Eichner	[Opal, Opal-AN] Neschen (n.d.)
Weyer ⓘ Mühlein	[Amber] G.Geyer et al. (1911)
Steyr ⓘ Michaeler church	[Amber] Neschen (n.d.)
ⓘ Zwischenbrücken	[Amber] Brandstetter (2000)

Baltic Sea	[Amber]


Belgium
ⓘ Brussels	[Opal] Hatert et al. (2002)
Flanders Antwerp ⓘ Antwerp	[Amber] Hatert et al. (2002)
ⓘ Wommelgem	[Amber] Hatert et al. (2002)
East Flanders ⓘ Aalter	[Opal] Heirman et al. (2002) +3 other references
Flemish Brabant Linter ⓘ Wommersom	[Amber] Hatert et al. (2002)
ⓘ Tienen	[Opal] Hatert et al. (2002)
Zaventem ⓘ Sint-Stevens-Woluwe	[Opal] Hatert et al. (2002)
Wallonia Hainaut Binche ⓘ Leval-Trahegnies	[Amber] Hatert et al. (2002)
ⓘ Trahegnies	[Amber] Hatert et al. (2002)
ⓘ Courcelles	[Amber] Hatert et al. (2002)
ⓘ Fontaine-l'Évêque	[Amber] Hatert et al. (2002)
La Louvière ⓘ Houdeng-Aimeries	[Amber] Hatert et al. (2002)
ⓘ Strépy-Bracquegnies	[Opal] Hatert et al. (2002)
ⓘ Canal work site	[Opal, Opal-A var: Opal-AG] Mélon et al. (1976)
Lens ⓘ Lens	[Opal] Hatert et al. (2002)
ⓘ Montignies-lez-Lens	[Opal] Hatert et al. (2002)
Mons ⓘ Ciply	[Opal] natuurtijdschriften.nl (n.d.)
ⓘ Morlanwelz	[Amber] Hatert et al. (2002)
Liège Liège ⓘ Rocourt	[Opal] Fourmarier (1901) +1 other reference
Namur Doische ⓘ Matagne-la-Grande	[Opal] Harjo Neutkens collection
Namur ⓘ Vedrin	[Amber] Hatert et al. (2002)
Walloon Brabant ⓘ Court-Saint-Étienne	[Amber] Hatert et al. (2002)
Walhain ⓘ Nil-Saint-Vincent-Saint-Martin	[Opal] Hatert et al. (2002)

Bolivia
La Paz Aroma Province Patacamaya Municipality ⓘ Patacamaya	[Opal] Kempff et al. (La Paz, 2009)
Inquisivi Province Caracoles mining district ⓘ Caracoles Mine ?	[Opal] Kempff et al. (La Paz, 2009)
José Manuel Pando Province Berenguela mining district ⓘ San José de Berenguela Mine (Elisa Mine; Hucurani Mine)	[Opal] USGS Bulletin # 1975
Loayza Province Sapahaqui Caracato ⓘ Urmiri	[Opal, Opal-AN] Ahlfeld et al. (1955)
Oruro Carangas Province Todos Santos District ⓘ Carangas Mine (Orkho Thunko; Orcotunko)	[Opal] USGS Bulletin # 1975
Cercado Province Oruro ⓘ Iroco mine (Kori Chaka)	[Opal] USGS Bulletin # 1975
Pantaleón Dalence Province Huanuni ⓘ Cerro Pozokoni	[Opal] Federico Ahlfeld and Alejandro Schneider-Scherbina (1964)
ⓘ Huanuni mine	[Opal] Wilson (2001)
ⓘ Quimsacoya mine	[Opal] Ahlfeld et al. (1964)
Poopó Province ⓘ Poopó	[Opal] Salomon Rivas y Federico Ahlfeld (1998)
Potosí Antonio Quijarro Province Tomave Municipality ⓘ Tolapampa 2	[Opal, Opal-AN] Salomon Rivas y Federico Ahlfeld (1998)
Chayanta Province Macha area Condor Iquiña plateau ⓘ Huayoco	[Opal, Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955)
ⓘ Santiaguillo	[Opal, Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955)
Cornelio Saavedra Province Tacobamba Municipality ⓘ Canutillos subdistrict ?	[Opal, Opal-AN var: Hyalite] Pough (1976)
Colavi subdistrict ⓘ Colavi Mine	[Opal] Ahlfeld & Munoz Reyes (1955)
Daniel Campos Province San Pablo de Napa ⓘ El Desierto mine	[Opal, Opal-AN] Petrov (n.d.)
ⓘ San Pablo de Napa mine	[Opal] - (2005)
Nor Lípez Province ⓘ Ollague Volcano	[Opal] www.mineralmundi.com (in the sulphur deposits)
Rafael Bustillo Province Llallagua ⓘ Siglo Veinte Mine	[Opal] Petrov et al. (2006)
ⓘ Uncía	[Opal] Wilson (2001)
Sud Lípez Province ⓘ Laguna Verde	[Opal] USGS Bulletin # 1975 (1992)
ⓘ Rosario de Escala Mine (Escala Mine; Escala de Lipez Mine; Crosca Mine)	[Opal] Federico Ahlfeld and Alejandro Schneider-Scherbina (1964)
San Antonio de Lípez ⓘ Machu Socavón Mine	[Opal] Geology and Mineral Resources of the Altiplano and Cordillera Occidental (USGS Bulletin no. 1975)
San Pablo de Lípez Santa Isabel district ⓘ Santa Isabel Mine (Candelaria Mine)	[Opal] Donald Richter (1992)

Brazil	[Opal]

Amapá Pedra Branca do Amapari ⓘ Tucano mine	[Opal, Opal-AN] Soares et al. (2025)
Bahia ⓘ Boa Nova	[Opal] Sauer (1982) +1 other reference
ⓘ Brejinho farm	[Opal] Cassedanne et al. (1977)
ⓘ Boquira	[Opal, Opal-AN var: Hyalite] Sauer (1982)
Campo Formoso ⓘ Socotó mining district	[Opal] ...
ⓘ Campo Formoso ultramafic complex	[Opal] F. Zaccarini (2006)
Capim Grosso Pedras Altas ⓘ Pedras Altas claim	[Opal] Dutra et al. (2011)
Gavião ⓘ Apolinário farm	[Opal] Projeto Apatita
Guajeru ⓘ Baixa da Braúna farm	[Opal, Opal-AN] Cassedanne et al. (1977)
Ipirá ⓘ Panelas farm	[Opal] Projeto Apatita
ⓘ Retiro farm	[Opal] Projeto Apatita
ⓘ Ipirá complex	[Opal] Projeto Apatita
ⓘ Minas Gerais	[Opal] Martins da Pedra collection
Conselheiro Pena Barra do Cuieté ⓘ Urucum claim	[Opal] Atencio et al. (2004)
Galiléia Laranjeiras ⓘ Alto da Pitorra	[Opal, Opal-AN] Pagano et al. (2001)
Sapucaia do Norte ⓘ Sapucaia mine	[Opal, Opal-AN] Cassedanne et al. (1999)
Itinga ⓘ Taquaral	[Opal, Opal-AN] Menezes (n.d.)
Piauí valley ⓘ Guimarãesite occurrence	[Opal] Chukanov et al. (2007)
Romaria ⓘ Romaria mine	[Opal] Chaves et al. (Mesoproterozóico)
Pará São Geraldo do Araguaia ⓘ Manoel Ambrósio ranch	[Opal, Opal var: Fire Opal, Opal var: Jasper Opal, Opal var: Precious Opal, Precious Opal var: Boulder Opal] Revista Brasileira de Geociências
Paraíba Junco do Seridó ⓘ Alto Cajazeiras	[Opal] Pavel M. Kartashov analytical data
Salgadinho São José da Batalha ⓘ Heitorita mine	[Opal, Opal-AN] de Brito Barreto et al. (2010) +1 other reference
Vieirópolis Vieirópolis pegmatite field ⓘ Serra Branca amazonite pegmatite	[Opal, Opal-AN] e Souza et al. (2020)
Paraná Cerro Azul Mato Preto carbonatite complex ⓘ Clugger orebody	[Opal] JENKINS II (1987)
Foz do Iguaçu ⓘ Iguazu falls	[Opal] Geological Survey Professional Paper 327 (U.S. Department of the Interior, 1959)
ⓘ Piauí	[Opal, Opal var: Precious Opal] Sauer (1982)
ⓘ Buriti dos Montes	[Opal] Revista Escola de Minas 68 (2015) +1 other reference
Nazaré do Piauí ⓘ Calçadinha farm	[Opal, Opal var: Opal-CT, Opal var: Opaline, Precious Opal var: White Opal] Costa et al. (2016)
ⓘ Pedro II	[Opal, Opal var: Precious Opal] Sauer (1982) +1 other reference
ⓘ Barra	[Opal] de Brito Barreto et al. (2010)
ⓘ Boi Morto mine	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Sauer (1982) +1 other reference
ⓘ Bom Lugar	[Opal] Sauer (1982)
ⓘ Cantinho	[Opal] Sauer (1982)
ⓘ Centro dos Gomes claim	[Opal] Sauer (1982)
ⓘ Chã do Lambedor deposit	[Opal] de Brito Barreto et al. (2010)
ⓘ Corrente creek	[Opal] de Brito Barreto et al. (2010)
ⓘ Limão	[Opal] Sauer (1982)
ⓘ Mamoeiro claim	[Opal] Sauer (1982) +1 other reference
ⓘ Morro do Meio	[Opal] Sauer (1982)
ⓘ Pajeú claim	[Opal] de Brito Barreto et al. (2010)
ⓘ Pirapora	[Opal] de Brito Barreto et al. (2010)
ⓘ Rio dos Matos	[Opal] de Brito Barreto et al. (2010)
ⓘ Roça claim	[Opal, Opal var: Precious Opal] Sauer (1982)
ⓘ Rio Grande do Norte	[Opal]
Bodó ⓘ Bodó Mine	[Opal] de Hollanda et al. (2017)
ⓘ Currais Novos	[Opal, Opal-AN var: Hyalite] Sauer (1982)
ⓘ Lajes Pintadas	[Opal]
Parelhas ⓘ Capoeira 1 pegmatite (Boqueirãozinho pegmatite)	[Opal, Opal-AN] de Brito Barreto et al. (2010)
ⓘ Capoeira 2 pegmatite (Mulungu pegmatite)	[Opal, Opal-AN var: Hyalite] de Brito Barreto et al. (2010)
Rio Grande do Sul ⓘ Campos Borges	[Opal, Opal var: Fire Opal] ...
Caxias do Sul ⓘ Monte Bérico	[Opal, Opal-AN var: Hyalite] Fernando Brederodes Collection
Estância Velha ⓘ Incopel quarry	[Opal] Frank (2008)
ⓘ Lajeado	[Opal, Opal var: Fire Opal] Sauer (1982)
ⓘ Salto do Jacuí	[Opal] Strieder et al. (2006)
Rondônia Porto Velho ⓘ Amazon Opal mine	[Opal, Opal var: Fire Opal]
Santa Catarina ⓘ Tangará	[Opal, Opal-AN] Bergmann (2009)
ⓘ São Paulo	[Opal] Revista Brasileira de Geociências ...
São Paulo ⓘ Perus	[Opal] D Atencio & R Hypolito () +1 other reference
ⓘ Pegmatite quarries	[Opal] Fosfatos e Silicatos Secundários de ...
Serrana ⓘ Serrana quarry	[Opal, Opal-AN] Ruiz (2001)

Bulgaria
Dobrich Province Balchik Municipality Obrochishte ⓘ Obrochishte deposit	[Opal] Aleksiev (1967)
Haskovo Province Madzharovo Municipality Madzharovo ⓘ Madzharovo deposit	[Opal] Marchev et al. (2002)
Mineralni Bani Municipality ⓘ Mineralni Bani sand pit	[Opal] Marcus Voigt Collection
ⓘ Tatarevo	[Opal, Opal-AN] Marcus Voigt Collection
ⓘ Kardzhali Province	[Opal] ...
Kardzhali Municipality Beli Plast ⓘ Beli Plast complex	[Opal, Opal var: Opal-C, Opal var: Opal-CT] Dimowa et al. (2022)
ⓘ Krumovgrad Municipality	[Opal] www.clmc.bas.bg (2003)
ⓘ Ada Tepe Au deposit	[Opal] Marchev +6 other references
ⓘ Potochnitsa	[Opal] www.clmc.bas.bg (2003)
ⓘ Studen Kladenets	[Opal] Anton Ivanov field observation
Momchilgrad Municipality ⓘ Zvezdel	[Opal] Tschernich (1992)
ⓘ Dachiardite-K occurrence	[Opal] Encheva
Pazardzhik Province Rakitovo Municipality ⓘ Dorkovo	[Opal] Marcus Voigt Collection
Sofia City Province Stolichna Municipality ⓘ Lozen	[Opal] I. Kostov et al. (1964)
Yambol Province Tundzha Municipality Krumovo ⓘ Krumovo iron mine	[Opal, Opal var: Milk Opal] Marcus Vau Collection

Cambodia
Kampong Thom Province ⓘ Phnom Chi 2 (Chi Mountain)	[Opal, Opal-AN] United Nations (1993)
ⓘ Ratanakiri Province	[Opal] Austin (November–December 2005)
Stung Treng Province Khone district ⓘ Preah Angkol	[Opal, Opal-AN] United Nations (1993)
Takeo Province Kiri Vong District ⓘ Phnom Bayong	[Opal] Piilonen et al. (2023)

Cameroon
South Region Dja-Et-Lobo Meyomessi ⓘ Mezesse	[Opal] Willems et al. (2002)

Canada
ⓘ Alberta	[Amber] www.alpinegems.net
Peace River ⓘ Clear Hills	[Opal] Bertram et al. (1975) +1 other reference
British Columbia Alberni Mining Division Ahousat ⓘ Catface Cu-Mo deposit	[Opal] personal correspondence with Giles ... +1 other reference
Atlin Mining Division Nahlin River area ⓘ Nahlin River Ni-Cu occurrence	[Opal] Peatfield (n.d.)
ⓘ Opal Lake Ni-Cu occurrence	[Opal, Opal var: Opaline] Peatfield (n.d.)
Fort Steele Mining Division Kimberley St. Mary Lake ⓘ Hellroaring Creek Intrusive Complex	[Opal, Opal-AN var: Hyalite] personal correspondence with Giles Peatfield (see comments)
Kamloops Mining Division Bonaparte River ⓘ Scottie Creek Cr prospect	[Opal, Opal-AN var: Hyalite] Peatfield (n.d.)
Mt. Savona Deadman's River ⓘ Pass Valley	[Opal] Tschernich (1992)
Omineca Mining Division Burns Lake ⓘ Eagle Creek	[Opal, Opal var: Fire Opal, Opal var: Precious Opal] - (n.d.)
ⓘ Firestorm prospect	[Opal, Opal var: Common Opal, Opal var: Opal-Agate, Opal var: Precious Opal] Wojdak
Whitesail Range Troitsa Peak ⓘ Northern Lights claims	[Opal, Opal var: Hydrophane, Opal var: Precious Opal] - (n.d.)
Similkameen Mining Division ⓘ Coalmont	[Amber] Mustoe (1985)
ⓘ Princeton	[Amber] British Columbia Geological Survey +1 other reference
Vernon Mining Division Vernon ⓘ Klinker prospect	[Opal, Opal var: Amber Opal, Opal var: Honey Opal, Opal var: Hydrophane, Opal var: Precious Opal, Precious Opal var: Boulder Opal, Precious Opal var: White Opal] Simandl et al. (1997) +1 other reference
Manitoba ⓘ Cedar Lake	[Amber] Mason (1976) +1 other reference
Souris ⓘ Souris gravel pit	[Opal] Phillips (1978) +1 other reference
Newfoundland and Labrador Newfoundland Placentia Bay ⓘ La Manche	[Opal] White (2015)
Northwest Territories ⓘ O'Grady Lake area	[Opal] Ercit et al. (2003)
Nova Scotia Cumberland Co. Two Islands ⓘ McKay Head	[Opal] J.N. Wingard.
Lunenburg Co. ⓘ New Ross	[Opal] H. Piers
Ontario Hastings County Town of Bancroft Dungannon Township York River area ⓘ Golding-Keene Quarry ?	[Opal, Opal-AN var: Hyalite] Michael Adamowicz Collection
Kawartha Lakes ⓘ ~~Norland~~	[Opal, Opal-AN var: Hyalite] Shadow Lake RockHounders Facebook group
Renfrew County Brudenell-Lyndoch-and-Raglan Lyndoch Township Quadeville area ⓘ Beryl Pit	[Opal, Opal-AN] www.ontariominerals.com/berylpit.htm
Québec Abitibi-Témiscamingue Témiscamingue RCM Les Lacs-du-Témiscamingue ⓘ Kipawa alkaline complex	[Opal] Ansell et al. (1980)
Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)	[Opal] membres.lycos.fr (2003)
Lajemmerais RCM Varennes & St-Amable ⓘ Saint-Amable sill	[Opal] Horváth et al. (1998)
ⓘ Demix-Varennes quarry	[Opal] Horváth et al. (1998)
Yukon Dawson mining district ⓘ Clinton Creek Mine	[Opal] Sabina (1973)
Mayo mining district Macmillan Pass ⓘ Boundary Zone	[Opal, Opal var: Opal-A, Opal var: Opal-CT, Opal var: Opaline] Grema et al. (2024)

Cape Verde
Sotavento Islands ⓘ Santiago Island	[Opal] M.M.S. Cabral Pinto et al. (2011)

Chile
Antofagasta Antofagasta Province Antofagasta Escondida ⓘ El Peñón Mine	[Opal] Morales Leal et al. (2022)
Mejillones Mejillones peninsula ⓘ Cerro Mejillones	[Opal] Atencio et al. (2012) +1 other reference
Sierra Gorda ⓘ Alcaparrosa Mine	[Opal] Chukanov et al. (2016)
Caracoles mining district Caracoles ⓘ Los Tres Presidentes Mine	[Opal] Braithwaite et al. (2004)
El Loa Province Calama Chuquicamata District ⓘ Chuquicamata Mine	[Opal] Bandy (1938) +1 other reference
ⓘ El Tatio geothermal field	[Opal, Opal var: Opal-CT] TESIS PARA OPTAR AL GRADO DE MAGÍSTER ... +1 other reference
Ollagüe ⓘ Cerro Pabellón Geothermal System	[Opal, Opal var: Opal-C] Vidal et al. (2022) +1 other reference
Tocopilla Province María Elena ⓘ Santa Ana Mine (Chapacase Mine)	[Opal] samples analysed by Gerhard Mohn and ...
Araucanía Cautín Province ⓘ Alpehue geyser field	[Opal] Munoz-Saez et al. (2020)
Atacama Chañaral Province ⓘ Salar de Gorbea	[Opal] Pueyo et al. (2021)
Copiapó Province Copiapó Cachiyuyo de Llampos mining district Carrera Pinto ⓘ San Samuel Mine ("San Manuel Mine")	[Opal] samples analysed by Gerhard Mohn and ...
ⓘ Capitana Mine	[Opal] samples analysed by Gerhard Moehn.
Quebrada San Miguel ⓘ Los Azules mine	[Opal] samples analysed by Jochen Schlüter
ⓘ Soledad mine	[Opal] - (n.d.) +1 other reference
Tierra Amarilla ⓘ El Volcán Mine	[Opal, Opal var: Opaline] Lohmeier et al. (2025)
ⓘ Dorado sector	[Opal, Opal var: Opaline] Lohmeier et al. (2022)
ⓘ Ojo de Agua Este sector	[Opal, Opal var: Opaline] Lohmeier et al. (2022)
Las Pintadas mining district Cerro Pintado ⓘ La Farola Mine	[Opal] samples analysed by Gerhard Mohn and ...
Pampa Larga mining district ⓘ Jote Mine	[Opal] samples analysed by Dr. Tony Kampf +2 other references
ⓘ Veta Negra Mine	[Opal] samples analysed by Gerhard Mohn and ...
Huasco Province Alto del Carmen ⓘ Pascua Lama project	[Opal, Opal var: Opaline] Deyell et al. (2005) +1 other reference
Coquimbo Elqui Province ⓘ Canto Sur Mine	[Opal] Jannas R./Araneda R. +3 other references
Tarapacá Tamarugal Province Huara ⓘ Patricia deposit	[Opal] Chinchilla et al. (2016)
Pozo Almonte Cerro Challacollo ⓘ Lolón Main Mine	[Opal, Opal var: Opaline] TOM HENRICKSEN et al. (2002)
Valparaíso Los Andes Province ⓘ Vizcachitas property	[Opal, Opal-AN] Tetra Tech Chile (2019)

China
Anhui Anqing Huaining County ⓘ Bailing Au deposit	[Opal] Wenya Zhou and Deming Xu (1990)
Chizhou Qingyang Co. ⓘ Shimenkou Cu-Au-S-Fe deposit (Zhimenkou Cu-Au-S-Fe deposit)	[Opal] Pan et al. (1999)
Chuzhou Quanjiao County ⓘ Quanjiao sepiolite deposit	[Opal] Pan Fang et al. (1981) +2 other references
Ma'anshan Dangtu County Zhonggu Fe ore field (Zhongshan-Gushan Fe ore field; Zhonggushan Fe ore field) ⓘ Gushan Mine	[Opal] Liu et al. (2018)
Wuhu Fanchang County ⓘ Xiaoyangchong deposit	[Opal] Zhang et al. (2023)
Nanling County ⓘ Yaojialing Zn-Au deposit	[Opal] Chunhua Wen et al. (2011)
Xuancheng Jixi Co. ⓘ Ladaling U deposit	[Opal, Opal-AN var: Hyalite] National Geological Archives of China ...
Chongqing Chengkou Co. ⓘ Gaoyan Mn deposit	[Opal] Gongqin Zhang (1986)
Fujian Longyan Liancheng Co. Liancheng Mn deposit ⓘ Lanqiao Mine	[Opal] Nanlai Zheng et al. (1986) +1 other reference
Shanghang Co. Zijinshan ore field ⓘ Zijinshan Mine	[Opal] Zijin Mining Group Company Limited
Ningde Zhouning Co. ⓘ Qinxi-Guansi Ag-Pb-Zn deposit	[Opal] Yachui Jiang et al. (1994)
Zhangzhou Yunxiao Co. Tongbei ⓘ Wushan Spessartine Mine	[Opal, Opal-AN] Ottens (2005)
Zhangpu Co. Fotan ⓘ Fotan Group	[Amber] Chang et al. (2023)
Gansu Gannan Diebu Co. (Têwo Co.) ⓘ Luoda U deposit	[Opal] National Geological Archives of China ...
Jiuquan Guazhou Co. ⓘ Shuangjingzi Fe deposit	[Opal] Laigeng Yang (1989)
Subei Co. ⓘ Nanjinshan Au Mine	[Opal] Yuanchao Shen et al. (2006) +1 other reference
Guangdong Heyuan Zijin Co. ⓘ Tiezhang Sn deposit	[Opal] Gongsheng Yan (1987)
Shaoguan Nanxiong Co. ⓘ Zoumalian	[Opal] Liangshu Shu et al. (2004)
Shixing Co. ⓘ Diaodangpai zeolite occurrence	[Opal] Liangshu Shu et al. (2004)
Wengyuan Co. ⓘ Xiazhuang Uranium ore field (Xiwang Uranium ore field)	[Opal] Dahlkamp (2009)
Guangxi Chongzuo Daxin Co. ⓘ Daxin Mine (Saqisan Mine; Sanqisan Mine; U deposit No. 373)	[Opal] Min et al. (2002)
Guizhou Qianxinan Qinglong County ⓘ Wangjiawan Au deposit	[Opal] Yongzhi Zhang and Maorong Zhen (2004)
Hainan Changjiang Co. ⓘ Shilu Mine	[Opal] Hanzhu Wang (1985)
Paracel Islands ⓘ Chenhang Island	[Opal] Zhang et al. (2018)
Hebei Handan Wu'an County ⓘ Yingli Au deposit	[Opal] Guilin Xu et al. (2006)
Qinhuangdao Qinglong County ⓘ Xiazhangzhi Au deposit	[Opal] wrgis.wr.usgs.gov (2004)
Heilongjiang Daxing'anling Tahe County ⓘ Shiwuliqiao Au deposit	[Opal] Xiangwen Li et al. (2014)
Heihe Xunke County ⓘ Gaosongshan Au deposit	[Opal] Zhong Tang et al. (2010)
Jixi Hulin City ⓘ Sipingshan Au deposit	[Opal] Yongwei Huang et al. (2010) +1 other reference
ⓘ Xianfengbeishan Au deposit	[Opal] Jianguo Yang et al. (2005)
Yichun Jiayin County Wulaga Mine ⓘ Tuanjiegou Au deposit	[Opal] www.portergeo.com.au (n.d.) +1 other reference
Henan Luoyang Luanchuan County Nannihu ore field ⓘ Nannihu-Sandaozhuang Mine	[Opal] Jichang Weng et al. (2010)
Nanyang ⓘ Xixia County	[Amber] Huishu Wang (1989)
Sanmenxia Lingbao City ⓘ Yinjiagou polymetallic deposit	[Opal] Guang Wu et al. (2013)
Hong Kong New Territories Sha Tin District Ma On Mountain (Ma On Shan) ⓘ Ma On Shan Mine	[Opal] Li (2007)
Hunan Loudi Lengshuijiang Co. ⓘ Xikuangshan Sb deposit (Xikuangshan antimony deposit)	[Opal] Guozhang Wen et al. (1993)
Lianyuan Co. ⓘ Baihua’ao Fluorite deposit	[Opal] Zhang et al. (2026)
Shaoyang Shaodong Co. ⓘ Lushan'ao Mn deposit	[Opal] Ziqiang Wei (1976)
ⓘ Unnamed U deposit (1)	[Opal] Hunan 230 Laboratory et al. (1976)
Xiangtan Yuhu District ⓘ Heling Mn deposit	[Opal] Ziqiang Wei (1976)
Yiyang Heshan District ⓘ Tangganshan Mine	[Opal] Ziqiang Wei (1976)
Zhuzhou Liling Co. Liling goldfield ⓘ Xiaojiashan Au deposit	[Opal] Hou et al. (2023)
Inner Mongolia Alxa League (Alashan Prefecture) Ejin Banner (Ejina Co.) ⓘ Laodonggou Mine	[Opal] Dianhao Huang and Baolin Wang (1997)
Baotou City Bayan Obo mining district ⓘ Bayan Obo deposit	[Opal] Qing-chang (1981)
Bayannur City (Bayannao'er Prefecture) Urad Rear Banner (Wulate Houqi) ⓘ Dongshengmiao Mine	[Opal] Zhaolong Li et al. (1981)
ⓘ Tanyaokou Fe-Cu-Zn deposit	[Opal] Zhaolong Li et al. (1981)
Chifeng City (Ulanhad League; Chifeng Prefecture) Bairin Left Banner (Balin Zuoqi) ⓘ Tuofengshan Cu-Fe deposit	[Opal] Tai Zhang and Yunji Liu (2002)
Hinggan League (Xing'an Prefecture) Tuquan County ⓘ Lianhuashan Cu-Ag Mine	[Opal] Lingan Bai et al. (2012)
Hulunbuir City (Hulunbei'er Prefecture) Ergun City (E'erguna Co.) ⓘ Sanhe Pb-Zn deposit	[Opal] Liu et al. (2022)
Genhe ⓘ Biliya deposit	[Opal, Opal var: Oolitic Opal] Xu et al. (2022)
ⓘ Erdaohezi Pb-Zn deposit	[Opal] Xu +4 other references
Hailar District (Haila'er District) ⓘ Hailar basin	[Amber] Chang et al. (2023)
Old Barag Banner (Chenba'erhu Co.) ⓘ Xie'ertala Mine	[Opal] Feng Yuan et al. (2012)
Ulanqab City (Wulanchabu Prefecture) Dorbod Banner (Siziwang Co.) ⓘ Sumt Qagan Obo Mine (Sumo Qagan Obo Mine; Sumo Chagan Aobao Mine)	[Opal] Fengjun Nie et al. (2008)
Xilingol League (Xilinguole Prefecture) West Ujimqin Banner (Xiwuzhumuqin Co.) ⓘ Baiyinchagan Mine (Bayanchagan Mine; Chagan Mine)	[Opal] Wang et al. (2024)
ⓘ Wuliji’Oboo deposit	[Opal] Zou et al. (2022)
Jiangsu Huai'an Xuyi Co. ⓘ Huangnishan clay deposit	[Opal] Tianhu Chen et al. (2002) +1 other reference
ⓘ Yongxiaoshan sepiolite deposit	[Opal] Wenguang Li (1997) +1 other reference
Suzhou Huqiu District ⓘ Suzhou china clay deposit	[Opal] Kecong Han and Shengyun Ma (1985)
Jiangxi Ganzhou Ruijin Co. ⓘ Xiefang Mine	[Opal] Yunhuai Lin (1986)
Jiujiang Xiushui Co. Xiushui Uranium ore field ⓘ Baitou U deposit (Baiti U deposit)	[Opal] Dahlkamp (2009)
ⓘ Baofengyuan U deposit (Baoyan U deposit)	[Opal] Dahlkamp (2009)
Jilin Baishan Fusong County ⓘ Lushuihe Mine	[Opal] Jie Yao et al. (2002)
Jiangyuan District (Hunjiang Co.) ⓘ Xiaoshiren Au deposit	[Opal] Shiyuan Wang et al. (2007)
Jilin Huadian City Jiapigou ore field ⓘ Wangjiadian Mine	[Opal] Bin Kang et al. (2000)
Yanbian Chaoxianzu Wangqing County ⓘ Jiusangou Au deposit (Jiushisangou Au deposit)	[Opal] Hai Zhao et al. (2008)
Yanji City ⓘ Wufeng-Wuxingshan Au-(Ag) deposit	[Opal] Renyi Chen and Zhongyao Rui (1993)
Liaoning Anshan Haicheng Co. ⓘ Xiaoshengshuisi magnesite deposit	[Opal] Zheng et al. (2026)
Fushun Wanghua District ⓘ Fushun Mine	[Amber] www.smartminerals.com (2004)
Xinfu District ⓘ West Open-pit Coal Mine	[Amber] Xing et al. (2013)
Shandong Linyi Pingyi County Tongshi complex ⓘ Guilaizhuang Au Mine	[Opal] Changfu Chen et al. (1999)
Shanxi Shuozhou Pinglu District ⓘ Qiangfengling Mine	[Opal] Yongtao Zhang and Guiqin Tang (1986)
Sichuan Ngawa Autonomous Prefecture (Aba Autonomous Prefecture) Zoigê Co. (Ruo'ergai Co.) ⓘ Dengmo Au deposit	[Opal] Su Sun (1993)
ⓘ Pingding Au-As-Hg deposit (Dingping Au-As-Hg deposit; Xionghuangpo Au-As-Hg deposit)	[Opal] www.cicresources.com (2006)
Tibet Lhasa Damxung Co. (Dangxiong Co.) ⓘ Yangbajing sulphur deposit	[Opal] Xiangang Meng et al. (2004)
Nagqu Amdo Co. (Anduo Co.) ⓘ Meiduo Sb deposit	[Opal] Shenghao Yan et al. (2003) +1 other reference
Ngari Gê'gyai Co. (Geji Co.) ⓘ Zhule prospect	[Opal] Jin-Xie; Ju-Tang; Zhi-Liu; Qing-Sun; Li-Yu; Chang-Yuan; Xu-Yan; Xiao-Zhao; Qing-Yin; Kang (2026)
Qamdo Prefecture (Changdu Prefecture) Baxoi Co. (Basu Co.) ⓘ Kamado magnesite deposit	[Opal] Yu et al. (2024)
Xigazê Prefecture (Rikaze Prefecture; Shigatse Prefecture) Ngamring Co. (Angren Co.) ⓘ Targejia Cs deposit (Dagejia Cs deposit; Tagejia Cs deposit)	[Opal] Yuanyi Zhao et al. (2006)
Xaitongmoin Co. (Xietongmen Co.) Chabu Township ⓘ Chabu geothermal field	[Opal] Li et al. (2025)
ⓘ Xiongcun Cu-(Au) deposit	[Opal] Xinghai Lang et al. (2011)
Xinjiang Hami Prefecture (Kumul Prefecture; Qumul Prefecture) Yizhou District ⓘ Jinwozi Mine (Xinwozi Mine; Jinwuozi Mine)	[Opal] Wang et al. (2025)
Ili Kazakh Autonomous Prefecture Altay Prefecture (Aletai Prefecture) Jeminay County Eastern Sawur Caldera Complex ⓘ Kuoerzhenkuola Mine (Kurzhenkuola Mine)	[Opal] Yang et al. (2009)
Xinyuan Co. (Künes Co.) Tu'ergen ⓘ Qiaolekesayi Cu occurrence (Qiaolekesa Cu occurrence)	[Opal, Opal-AN] Wuhan Huaze Science & Technology ...
Kezilesu Autonomous Prefecture (Kizilsu Autonomous Prefecture; Qizilsu Autonomous Prefecture) Aketao Co. (Akto Co.; Aqto Co.) ⓘ Ortokarnash deposit	[Opal] Zhang et al. (2022) +1 other reference
Turpan Shanshan Co. ⓘ Shiyingtan Mine	[Opal] Zhang et al. (2004)
Wulumuqi Prefecture (Ürümqi Prefecture; Ürümchi Prefecture) Wulumuqi Co. (Ürümqi Co.; Ürümchi Co.) Chaiwobao Cu ore field ⓘ Xingshugou Cu deposit	[Opal] Jincao Wang et al. (2000)
Yunnan Baoshan Tengchong County ⓘ Longchuanjiang basin	[Opal] Dahlkamp (2009)
ⓘ Chengzishan Mine (Tengchong Mine; U deposit No. 381)	[Opal] Dahlkamp (2009)
ⓘ Rehai geothermal field	[Opal] Meixiang et al. (1987)
ⓘ Lianghe Au deposit	[Opal] Pin'an Wang (2001)
Tengchong Sn belt ⓘ Tieyaoshan W-Sn deposit	[Opal] Shilu Zhang (1986)
Chuxiong Chuxiong City ⓘ Xiaoshuijing Mine	[Opal] Yunman Zhou et al. (2009) +1 other reference
Dehong Lianghe County Tengchong Sn belt ⓘ Lailishan Sn deposit	[Opal] Shilu Zhang (1986)
Mangshi (Mang City) ⓘ Shangmanggang Au deposit	[Opal] www.spartonres.ca (n.d.)
Pu'er Mojiang County ⓘ Jinchang Mine (Mojiang Mine; Yuanjiang gold mine)	[Opal] Guangjun Yu and Ruyong Xie (1986) +1 other reference
Qujing Huize County Huize Zn-Pb-(Ag) ore field ⓘ Kuangshanchang Zn-Pb deposit	[Opal] Senning Tang (1984)
Zhejiang Jinhua Wuyi County ⓘ Wuyi fluorite ore field	[Opal] Panov et al. (1989)

Colombia
Boyacá Department Chivor ⓘ Chivor Mine	[Opal, Opal-AN] - (2002)
ⓘ Santander Department	[Amber] Dmitry Vorobjov's collection
ⓘ Valle del Cauca Department	[Opal, Opal var: Milk Opal] Daniel S Yunis

Costa Rica
Alajuela Province San Carlos Canton ⓘ Venado	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
Guanacaste Province Cañas Canton ⓘ Los Angeles	[Opal] - (2005)
La Cruz Canton ⓘ Guapinol	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
Liberia Canton ⓘ Loma Camastro	[Opal] - (2005)
Limón Province Siquirres Canton ⓘ Rio Hondo	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
ⓘ Río Madre de Dios	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
Puntarenas Province Coto Brus ⓘ Limoncito	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
Esparza Canton ⓘ Salinas	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
ⓘ Gutiérrez Braun	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
ⓘ Herminio creek	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
ⓘ Pedro creek	[Opal, Opal var: Opal-CT] Mustoe et al. (2025)
San José Province Acosta Canton Guaitil District ⓘ Guaitil	[Opal] Zeledón (2004)

Croatia
Istria County Rovinj ⓘ Rovinj-1 bauxite deposit	[Opal] Perković et al. (2024)

Cuba	[Opal, Opal var: Moss Opal]

ⓘ Camagüey Province	[Opal] Jeffrey de Fourestier collection

Czech Republic
Central Bohemian Region Benešov District ⓘ Bernartice	[Opal, Opal var: Opal-CT] Kratochvíl
ⓘ Roudný deposit	[Opal] Zemek +5 other references
ⓘ Kladno District	[Opal] Žáček et al. (1995)
ⓘ Vinařice	[Opal] Pauliš
Kutná Hora District Vlastějovice Moldanubian Zone pegmatites Magdalena deposit ⓘ Hydrothermally altered amphibole-bearing pegmatite	[Opal] Novák et al. (2013) +1 other reference
Hradec Králové Region Jičín District Lázně Bělohrad Hřídelec ⓘ Hřídelec quarry	[Opal] www.mineralos.cz (2003)
Karlovy Vary Region Karlovy Vary District ⓘ Jáchymov	[Opal] Hloušek et al. (2002)
Potůčky ⓘ Marie Terezie vein	[Opal] Bufka
ⓘ Stráž nad Ohří	[Opal, Opal-AN var: Hyalite] Petr Fuchs collection
Valeč ⓘ Valeč Hyalite occurrences	[Opal, Opal-AN]
Sokolov District ⓘ Oloví	[Opal] Pauliš P. Nejzajímavější ...
Rovná Čistá ⓘ Jeroným Mine	[Opal] Janečka et al. (stav ke dni 1.7.1966)
Liberec Region ⓘ North Bohemian Uranium District	[Opal] Scharm +7 other references
Semily District Harrachov ⓘ Fluorite deposit	[Opal] Fengl +3 other references
Radostná pod Kozákovem ⓘ Votrubec quarry	[Opal] Pauliš
ⓘ Moravia (Mähren; Maehren)	[Opal, Opal var: Opal-C, Opal var: Opal-CT] Koníčková et al. (2021)
Olomouc Region Jeseník District Skorošice ⓘ Skorošice quarry	[Opal] Kruťa
Pardubice Region Pardubice District ⓘ Chvaletice	[Opal] Prachař +6 other references
ⓘ Litošice	[Opal] Zak (1956) +1 other reference
Ráby ⓘ Kunětická hill	[Opal] Pauliš P. Mineralogické lokality ...
Plzeň Region Klatovy District Hejná ⓘ Radvanka quarry	[Opal] Hofmanovi P. a R.: Mineralizace ...
Rokycany District Těškov ⓘ Těškov quarry (Lom Knezska hora)	[Opal] Janouš (1995) +4 other references
Tachov District ⓘ Bezděkov	[Opal, Opal-AN] Škácha et al. (2024)
Černošín ⓘ Vlčí hora	[Opal] Navrátil +4 other references
Chodský Újezd Dolní Jadruž ⓘ Svatá Anna	[Opal] Locality description
ⓘ Stříbro	[Opal] Pauliš +3 other references
South Bohemian Region České Budějovice District ⓘ Vrábče	[Opal] Boris Pralovszky find & collection
Český Krumlov District ⓘ Kremze	[Opal, Opal var: Prase Opal] Duda +1 other reference
Bohouškovice ⓘ Bohouškovice opal occurrences	[Opal]
Písek District Čížová ⓘ Phosphate occurrence	[Opal, Opal-AN] Cícha J.
Strakonice District Krty-Hradec ⓘ Krty quarries	[Opal] Litochleb (1997)
Tábor District Dolní Hořice ⓘ Pacova Hill quarry	[Opal] www.mineralos.cz (2003)
ⓘ Ratibořské Hory	[Opal] Vrtiška et al. (2019)
ⓘ Staré Hory deposit	[Opal, Precious Opal var: White Opal] Vrtiskova et al. (2024)
South Moravian Region Blansko District Letovice ⓘ Slatinka	[Opal] Ulrych
Rudice ⓘ Seč quarry	[Opal, Opal var: Cacholong] Dana RICHTEROVÁ et al. (http://geolines.gli.cas.cz/fileadmin/volumes/volume13/G13-106.pdf)
Brno-City District ⓘ Černovice	[Opal] Mrázek
Brno-Country District ⓘ Dolní Loučky ?	[Opal] Uwe Kolitsch (visual ID)
Ivančice Hrubšice ⓘ U Pustého Mlýna Quarry	[Opal] Jirásek
ⓘ Nedvědice	[Opal] Houzar
ⓘ Níhov	[Opal] ...
Nová Ves ⓘ Serpentinite occurrence	[Opal, Opal var: Opal-CT] Koníčková Š. et al. (2016)
Ústí nad Labem Region Chomutov District Březno ⓘ Libous quarry	[Opal] Chukanov et al. (2019)
Kadaň Tušimice ⓘ Nástup Quarry	[Amber, Opal, Amber var: Duxite] Bouška
Klášterec nad Ohří ⓘ Roadcut on highway no. 13	[Opal] Wiesner
Málkov Ahníkov ⓘ Ahníkov pyroxenite outcrop	[Opal] Ř +5 other references
Měděnec ⓘ Nadějná	[Opal] MALÍKOVÁ R et al. (2020)
Děčín District Děčín Folknáře ⓘ Pustý Vrch	[Opal, Opal-AN var: Hyalite] Pauliš P. et al. (2015)
Jílové ⓘ Fluorite deposit	[Opal] Fengl +3 other references
Litoměřice District Úštěk ⓘ Pohorsko-Pohorský Hill	[Opal, Opal-AN var: Hyalite] P.Zeman et al. (2017)
Žitenice ⓘ Kočka (former Eulenberg)	[Opal, Opal-AN] Hibsch et al. (1911)
Louny District Libčeves Hořenec (Horzenz; Horschenz) ⓘ Číčov hill (Spitzberg)	[Opal] Filippi
Most District Braňany ⓘ Bentonite deposit Braňany II - Černý vrch	[Opal] Svejkovský J.
Korozluky ⓘ Korozluky magmatic rock occurrence (Kolosoruk magmatic rock occurrence; Kolloseruk magmatic rock occurrence)	[Opal] Filippi +5 other references
Lužice Opal occurrence ⓘ Opal occurrence	[Opal] Gramblička (n.d.)
Most ⓘ Komořany u Mostu	[Amber, Amber var: Duxite] Bouška
ⓘ Vršany mine	[Amber, Amber var: Duxite] Petr Fuchs
Teplice District Bílina ⓘ Bílina coal mine	[Amber, Opal, Amber var: Duxite] Petr Fuchs specimen
ⓘ Hradisko Outcrops	[Opal] Velebil
Krupka Vrchoslav ⓘ Vrchoslav fluorite deposit	[Opal] Analysed by geology lab Green Gas DPB
Zabrušany ⓘ Želénky	[Opal] Bouška
Ústí nad Labem District Chuderov Radešín ⓘ Radešín hill	[Opal, Opal-AN] www.geocities.com/Smula.geo
ⓘ Žežice	[Opal, Opal-AN]
Dolni Zálezly ⓘ Liščí vrch (former Fuchsberg)	[Opal] Paulis et al. (2014)
Petrovice ⓘ Špičák u Krásného Lesa	[Opal] Novák et al. (1987)
Řehlovice Radejčín ⓘ Starý hill	[Opal, Opal-AN] Radoň M. Významné mineralogické lokality Českého středohoří. Minerál 2009 (2)
Ústí nad Labem ⓘ Brná	[Opal, Opal-AN var: Hyalite] P.Pauliš
ⓘ Mariánská Skála (Mariánská hora; Marienberg)	[Opal] Ulrych (2000)
ⓘ Mojzir	[Opal, Opal-AN]
Vysočina Region Třebíč District Dukovany ⓘ Dukovany opal occurrence	[Opal] Slavíček
ⓘ Jemnice	[Opal] Houzar et al. (1991)
Mohelno ⓘ Bliemsried quarry	[Opal] Němec et al. (monografie hadce)
Třebíč Řípov ⓘ Residual rocks outcrop	[Opal, Opal var: Opal-CT] Trnka M (2006)
Žďár nad Sázavou District ⓘ Bobrůvka	[Opal] Paulis P. (2001)
Bory ⓘ Dolní Bory	[Opal] Staněk (1991) +4 other references
ⓘ Pegmatite vein No. 21	[Opal] Staněk (2009)
ⓘ Pegmatite vein Oldřich	[Opal] Staněk (1997)
Býšovec ⓘ Smrček	[Opal] Petr Pauliš (2001)
ⓘ Dobrá Voda	[Opal] Novák et al. (1999)
Rožná ⓘ Rožná (Opál)	[Opal] Petr Pauliš: Nejzajímavější mineralogická naleziště Moravy a Slezska II. (2005)
ⓘ Rožná pegmatite (Rozna; Roschna)	[Opal] Novák +2 other references
Štěpánov nad Svratkou ⓘ Borovec (Borowetz; Borowitz?)	[Opal] Velebil +5 other references
ⓘ Věchnov	[Opal] Kopa
Věžná ⓘ Věžná I pegmatite	[Opal] Canadian Mineralogist +1 other reference
ⓘ Věžná serpentinite quarry	[Opal] Petr Pauliš (2001) +1 other reference
Zlín Region Uherské Hradiště District Komňa ⓘ Bučník Hill Quarry	[Opal] Pauliš

Czech Republic/Germany/Poland
ⓘ Silesia	[Opal, Opal var: Prase Opal] Bauer et al. (1983)

Denmark	[Amber]

Capital Region ⓘ Bornholm Island	[Amber] Langenheim (1969) +1 other reference
Central Denmark Region Skive Municipality ⓘ Fur Island	[Opal] Bøggild (1943) +1 other reference
North Jutland Region Morsø Municipality Mors Island ⓘ Hanklit	[Opal] Torben Kjeldgård photo & specimen
Hesselbjerg ⓘ Skarrehage Diatomite Pit	[Opal] Bøggild (1943)

Dominican Republic
Hato Mayor Province ⓘ Sabana de la Mar (Sabana)	[Amber] www.gplatt.demon.co.uk (n.d.)
Sánchez Ramírez Province Cotuí ⓘ Lignite deposits	[Amber] www.gplatt.demon.co.uk (n.d.)
Santiago Province ⓘ Cordillera Septentrional	[Amber] www.gplatt.demon.co.uk (n.d.)
ⓘ Santiago de Los Caballeros	[Amber] Raúl Joreg Tauber Larry
ⓘ La Toca amber mines	[Amber] Raúl Jorge Tauber Larry
ⓘ Palo Alto amber mining area	[Amber] Steiner (1996)

DR Congo
Haut-Katanga Kambove Territory Shinkolobwe ⓘ Shinkolobwe Mine	[Opal] Gauthier et al. (1989)
Kasaï ⓘ Kasai river alluvials	[Opal] Edwards (1917)
Lualaba Mutshatsha ⓘ Tilwezembe mine	[Opal, Opal-AN] Uwe Haubenreisser collection

Ecuador	[Opal, Opal var: Fire Opal]

Azuay Province Sigsig Canton ⓘ Asaray project (Satunsaray project)	[Opal] Bolaños (2015)
Chimborazo Province Alausi Canton ⓘ Tixan	[Opal] www.municipiodealausi.gob.ec (n.d.)
Guayas Province Guayaquil Canton Guayaquil ⓘ Faculty of Natural Science construction site	[Opal] Ordoñez (2006)
Zamora-Chinchipe Province Yantzaza Canton ⓘ Fruta del Norte Au-Ag deposit	[Opal, Opal var: Opaline] an NI 43-101 Technical Report prepared ... +1 other reference

Egypt
Beheira Governorate Abu Hommos Nakhla ⓘ Nakhla Martian meteorite	[Opal, Opal var: Opal-A] Lee et al. (2015)
Giza Governorate ⓘ Bahariya Oasis (Baharia Oasis)	[Opal] S. Tosson et al.

Ethiopia
Afar Region ⓘ South Gondar Opal Occurrences	[Opal] tracktech.net (n.d.)
Amhara Region North Shewa Zone ⓘ Mezezo Opal Occurrence	[Opal, Precious Opal var: White Opal] GIA 2019
ⓘ Yita ridge	[Opal] Gem Information (Japan Germany Gemmological Laboratory)
Mida (Midda) ⓘ Amber occurrence	[Amber] www.ambergallery.it
ⓘ North Wollo Zone	[Opal] Chauviré et al. (2017)
ⓘ Delanta Woreda	[Opal] Chauviré et al. (2019)
ⓘ Tsehay Mewcha	[Opal] Schäfer (2012)
ⓘ Wegeltena	[Opal, Opal var: Opal-CT] Rondeau et al. (2010)
Wadla Woreda ⓘ Gashena	[Opal] Lore Kiefert et al. (2014)
ⓘ South Wollo Zone	[Opal, Fire Opal var: Precious Fire Opal, Opal var: Precious Opal, Precious Opal var: White Opal] Locality description +1 other reference
Tenta Woreda ⓘ Ajebar mine	[Opal] Google Earth/José Zendrera
Oromia Region Hawasa ⓘ Shalo hot spring	[Opal] Žáček et al. (2015)
ⓘ Lake Shala (Lake Shalla)	[Opal] Petrov (n.d.)
Somali Region Jijiga ⓘ Marda Pass ?	[Opal] Jelenc (1966)
Southern Nations Nationalities and Peoples' Region ⓘ Arbegona District	[Opal, Opal-AN] Rock Currier collection

Europe
ⓘ Albera Massif	[Opal] Berbain et al. (2012)
Ore Mountains ⓘ Zinnwald-Cínovec mining region	[Opal] Petr Fuchs +1 other reference

Faroe Islands	[Opal]

Eysturoy Region Eystur Municipality Syðrugøta ⓘ Gøtueið	[Opal] Collection of Volker Betz
Norðoyar Region Klaksvíkar Municipality Ánirnar ⓘ Strond Quarry	[Opal] Zeolite collection of Volker Betz +1 other reference
Streymoy Region Streymoy ⓘ Hoyvik	[Opal, Opal var: Opal-CT] Caucia et al. (2013)
Tórshavn Municipality ⓘ Tórshavn	[Opal, Opal var: Opal-CT] Caucia et al. (2013)

Fiji
Vanua Levu Macuata Nukundamu ⓘ Undu mine ("Udu mine")	[Opal]

Finland
Kanta-Häme Forssa ⓘ Kiimassuo pegmatite	[Opal] Ilkka Mikkola collection
Kymenlaakso Kotka ⓘ Topaz quarry	[Opal] Lahti Seppo I. 2011. Kotkan ...
Ostrobothnia Korsnäs ⓘ Korsnäs Lead Mine	[Opal] The world of opals By Allan W. Eckert
South Karelia Luumäki Kännätsalo ⓘ Karelia Beryl Mine pegmatite	[Opal] P. Koski sample
South Ostrobothnia Alavus ⓘ Töysä	[Opal] Joel Dyer collection
Southwest Finland Salo Suomusjärvi ⓘ Salittu	[Opal] Niskanen (2014)

France
Auvergne-Rhône-Alpes Allier Montluçon ⓘ Chamblet	[Opal] M. Arliguie collection
Moulins Saint-Hilaire ⓘ Montalimbert mine	[Opal] Périchaud (1985)
Ardèche Privas ⓘ Saint-Bauzile	[Opal] Yves Masson specimens
Saint-Priest ⓘ Col de l'Escrinet	[Opal] Bull. Soc. Franç. Minéralo. ...
Cantal Mauriac Menet ⓘ Puy de Menoyre	[Opal] Vessely Yannick collection
Saint-Flour Laveissière Le Lioran ⓘ Plomb du Cantal	[Opal] Yves Masson specimen.
Val-d'Arcomie ⓘ Clavières d'Outre	[Opal] www.brgm.fr (2003)
ⓘ Faverolles quarry	[Opal, Opal-AN] Robin Fialip
Haute-Loire Brioude Chastel ⓘ Moulergues	[Opal] Belot (1978)
Jax ⓘ La Ribeyrette & La Fauvette valleys (La Fioure; La Fiouve)	[Opal]
Mazeyrat-d'Allier ⓘ Rassac	[Opal, Opal-AN] Pierre Le Roch Collection
Saint-Beauzire ⓘ La Violette farm	[Opal] Pélisson (1989)
Le Puy-en-Velay Ceyssac ⓘ Mont Croustet	[Opal, Opal-AN] Collected by Stéphane Jamon
Landos ⓘ La Sauvetat ?	[Opal, Opal-AN] Kreipl (1974)
ⓘ Saint-Pierre-Eynac	[Opal] Belot (1978)
Yssingeaux Araules ⓘ Courcoules	[Opal] Périchaud (1986)
Loire Montbrison Châtelneuf ⓘ Mont Semiol	[Opal, Opal-AN] Anthony Geneyton Collection
Roanne Ambierle ⓘ Hauteville	[Opal] BRGM (1981)
Saint-Étienne Saint-Priest-en-Jarez ⓘ Le Crêt	[Opal] G. Demarcq
Puy-de-Dôme Ambert ⓘ Cunlhat	[Opal, Opal-A var: Opal-AG]
Clermont-Ferrand Clermont-Ferrand ⓘ Puy de Crouel	[Opal, Opal var: Opal-CT, Opal-CT var: Lussatite] Remi Bornet Collection +1 other reference
ⓘ Puy de la Poix	[Opal, Opal-CT var: Lussatite] Devouard et al. (2015)
La Roche-Blanche ⓘ Gergovie	[Opal] Belot (1978) +1 other reference
ⓘ Puy de Mardoux quarry	[Opal, Opal var: Opal-CT] Fermis (2022)
Lempdes ⓘ Gandaillat quarry	[Opal, Opal var: Opal-CT, Opal-CT var: Lussatite] Remi Bornet Collection +1 other reference
ⓘ Puy de la Bourrière	[Opal, Opal var: Opal-CT, Opal-CT var: Lussatite] Remi Bornet Collection +1 other reference
Mur-sur-Allier ⓘ Les Rois Mine	[Opal, Opal var: Opal-CT] Aimé Rudel : "Curiosités Géologiques ...
ⓘ Puy du Mur Quarry	[Opal, Opal var: Opal-CT] Remi Bornet Collection
ⓘ Pont-du-Château	[Opal, Opal var: Opal-CT] Remi Bornet Collection
ⓘ Champ des Poix mine	[Opal, Opal var: Opal-CT] Remi Bornet Collection
Romagnat Saulzet-le-Chaud ⓘ Côte des Pompes	[Opal] Bariand et al. (n.d.)
Saint-Genès-Champanelle ⓘ Puy de la Vache	[Opal, Opal-AN var: Hyalite] Mboungou-Kongo (2002)
ⓘ Puy de Lassolas	[Opal] Mboungou-Kongo (2002)
Issoire Besse-et-Saint-Anastaise ⓘ Pavin lake	[Opal] gsa.confex.com (n.d.)
ⓘ Super-Besse ski resort	[Opal, Opal-AN var: Hyalite]
Chastreix ⓘ Bois du Loup	[Opal, Opal-AN var: Hyalite] Designolle (2021)
Gignat ⓘ La Chaux de Bergonne	[Opal] Artioli et al. (1999)
Perrier ⓘ Roca-Neyra ?	[Opal] my collection
Saint-Babel ⓘ Prudeux	[Opal, Opal-AN] Barrier et al. (2009)
Saint-Nectaire ⓘ Mineral spring	[Opal, Opal var: Forcherite] Alain Tuel collection
Riom ⓘ Lussat	[Opal, Opal var: Opal-CT, Opal-CT var: Lussatite] Mallard
Saint-Jacques-d'Ambur ⓘ La Barre Mine (La Martinèche Mine)	[Opal]
Saint-Ours-les-Roches ⓘ Puy de Ténuzet quarry	[Opal] Mboungou-Kongo (2002)
Thiers Lachaux ⓘ Bigay Mine	[Opal] J.-J. Périchaud: "Où trouver les minéraux d'Auvergne" et al. (Clermont-Ferrand)
ⓘ Etang de Reliez	[Opal] J.-J. Périchaud: "Où trouver les minéraux d'Auvergne" et al. (Clermont-Ferrand)
ⓘ Gourniaud Mine	[Opal] P.-C. Guiollard (2002)
ⓘ Roffin Mine	[Opal] Queneau (n.d.)
Puy-Guillaume Philibin ⓘ Rez de Sol	[Opal]
Ris ⓘ Bancherelle Mine	[Opal]
ⓘ Gagnol Mine	[Opal] J. Geffroy
ⓘ Reliez	[Opal] J. Chervet +1 other reference
Saint-Rémy-sur-Durolle ⓘ Unnamed quartz-pitchblende vein	[Opal] J. Chervet and G. Branche : ...
Rhône Villefranche-sur-Saône Chessy ⓘ Chessy copper mines	[Opal] Coueille (1988)
Bourgogne-Franche-Comté Nièvre Château-Chinon Larochemillay ⓘ Les Rompas	[Opal] Gourault et al. (2021)
Saône-et-Loire Mâcon Bonnay Besanceuil ⓘ La Roche	[Opal] OLLIC Pascal Collection
Brittany Côtes-d'Armor Guingamp Trémargat ⓘ Gwernavalou Quarry	[Opal] Germain C. (1988)
Saint-Brieuc ⓘ Saint-Lubin	[Opal] Bibinger et al. (2014)
Ille-et-Vilaine Fougères-Vitré ⓘ Fougères	[Opal, Opal var: Girasol] Lukas (1978)
ⓘ Fougères Forest	[Opal] John BRUNET collection
Le Pertre ⓘ LGV construction site (railroad)	[Opal, Opal var: Opal-CT] Brunet (2016)
Morbihan Pontivy Guern ⓘ Quistiav (Quistiave)	[Opal] R. Pierrot
Centre-Val de Loire Cher Vierzon ⓘ Quincy	[Opal, Opal var: Quinzite Opal] The Quincyte pigments: fossil quinones ...
Indre-et-Loire Loches Paulmy ⓘ Paulmy quarry	[Opal] Cocher (2015)
Corsica Haute-Corse Bastia Canari ⓘ Marinca	[Opal] Favreau (n.d.)
French Polynesia Wallis and Futuna ⓘ Analkele deposit	[Opal] Pelleter et al. (2017)
ⓘ Utu Uli deposit	[Opal] Pelleter et al. (2017)
Grand Est Bas-Rhin Molsheim Oberhaslach ⓘ Nideck	[Opal] Kuntz et al. (2025)
Guadeloupe Basse-Terre Vieux-Habitants ⓘ Madeleine-Soufrière volcanic massif	[Opal] Olivier Mével specimen
Ile-de-France Essonne Palaiseau Bruyères-le-Châtel ⓘ Arpenty quarry	[Amber] Belot (1978)
ⓘ Paris	[Opal] Belot (1978)
ⓘ Ménilmontant	[Opal]
Val-d'Oise Argenteuil Cormeilles-en-Parisis ⓘ Lambert Quarry	[Opal] Belot (1978)
Martinique Arrondissement of La Trinité Grand'Rivière ⓘ Montagne Pelée	[Opal] Lacroix (1910)
Arrondissement of Le Marin Les Trois-Îlets ⓘ Anse à l'Âne	[Opal] Robertson Collection
Sainte-Anne ⓘ Savane des Pétrifications	[Opal] Lacroix (1907)
New Caledonia Northern Province ⓘ Diahot River Valley	[Opal] Briggs (1975)
Houaïlou ⓘ Poro Mine	[Opal] Berger et al. (2011) +1 other reference
Ouégoa ⓘ Fern Hill Mine	[Opal] Briggs (1975)
Pouembout ⓘ Népoui Mine	[Opal] Berger et al. (2011) +1 other reference
Voh ⓘ Koniambo Mine	[Opal, Opal-AN] Cathelineau et al. (2024)
Southern Province Yaté ⓘ Goro Mine	[Opal] Vale SA
Normandy Manche ⓘ Cherbourg	[Opal] Yale Peabody Museum
Nouvelle-Aquitaine ⓘ Charente-Maritime	[Amber] NÉRAUDEAU D. et al. (Albien terminal probable)
Corrèze Ussel Meymac ⓘ La Grange Mine	[Opal, Opal-AN] Ansermet et al. (2010)
Deux-Sèvres Bressuire Mauléon Le Temple ⓘ La Commanderie mine	[Opal] Lièvre et al. (2002)
Dordogne Bergerac ⓘ Le Buisson-de-Cadouin	[Opal] Belot (1978)
Nontron Saint-Pardoux-la-Rivière ⓘ Le Manderau (Le Mandereau; Le Mandaraud)	[Opal] BRGM survey data
Gironde Libourne Coutras ⓘ Coutras deposit	[Opal, Opal var: Opal-CT] Econ Geol (1989)
Haute-Vienne Limoges Saint-Sylvestre ⓘ Fanay Mine	[Opal] J. Geffroy
Occitanie Aude Limoux ⓘ Fourtou	[Amber] Collection Alex Trencart
Aveyron Millau Roquefort-sur-Soulzon ⓘ Roca Negra	[Opal] Club Minéralogique de Saint-Juery (2025)
Rodez Pruines ⓘ Le Kaymar	[Opal] Georges FAVREAU collection and EDX ...
Villefranche-de-Rouergue Firmi ⓘ Puy de Wolf (Puech de Voll)	[Opal]
Gard Le Vigan Alzon ⓘ ~~Valcroze~~	[Opal, Opal-AN] Queneau (n.d.)
Haute-Garonne Saint-Gaudens Moncaup ⓘ Moncaup S.S.1	[Opal] Inventaire Minéralogique de la France ...
ⓘ Hérault	[Opal] TREILLARD Michel collection
Béziers ⓘ Caux	[Opal] collection bernard bouissac
Lodève ⓘ Fontès	[Opal] collection bernard bouissac
Le Bosc ⓘ Riviéral	[Opal] Bortolozzi (n.d.)
Le Puech ⓘ Rabejac Est	[Opal] Bortolozzi (n.d.)
Pyrénées-Orientales Céret Collioure ⓘ Pegmatite field	[Opal] Berbain et al. (2012)
Prades Mosset ⓘ Mosset rare earths deposit	[Opal, Opal-AN] Remy et al. (2014)
Tarn Castres Fontrieu Fumade ⓘ Phosphate occurrence	[Opal] Jean-Marie LAURENT's collection
Montredon-Labessonnié Peyrebrune ⓘ La Caravantié quarry	[Opal] François Garric collection
Pays de la Loire Loire-Atlantique Nantes Indre ⓘ Haute-Indre	[Opal, Opal-AN var: Hyalite] Baret (1905)
ⓘ Le Loroux-Bottereau	[Opal] Baret (1905)
Mayenne Laval Le Genest-Saint-Isle ⓘ La Lucette mine	[Opal, Opal-AN] Cheval-Garabédian et al. (2023)
Vendée Les Sables-d'Olonne ⓘ La Garnache	[Amber] Vincent Perrichot 2014 (northwestern France)
Provence-Alpes-Côte d'Azur Alpes-Maritimes Grasse Arrondissement ⓘ Biot	[Opal] Fröhlich et al. (2001)
Nice Arrondissement Saint-Etienne-de-Tinée ⓘ ~~Claï~~	[Opal] Chollet Pascal Collection
Var Draguignan Fréjus ⓘ Les Trois Termes outcrop	[Opal, Opal-AN var: Hyalite] S. MAURY (S)
Saint-Raphaël Agay ⓘ Le Gratadis ravine	[Opal, Opal-AN] MAURY (S)
ⓘ Le Mal-Infernet ravine	[Opal, Opal-AN var: Hyalite] MAURY (S)
Vaucluse Apt ⓘ Courgas ravine	[Opal] F. Roulin et al.
ⓘ Réunion	[Opal, Opal var: Mascareignite] [Hey p438]
Saint-Paul ⓘ Maïdo	[Opal, Opal-AN] collection Joachim Esche

Georgia
Adjara ⓘ Goderdzi Petrified Forest Natural Monument	[Opal, Opal var: Opal-A, Opal var: Opal-CT] Alexander G. Tvalchrelidze (2003) +1 other reference
Kvemo Kartli ⓘ Bolnisi District	[Opal] M. et al. (2019)
ⓘ Madneuli Mine	[Opal] Ramaz Migineishvili (2005)

Germany
Baden-Württemberg Freiburg Region Breisgau-Hochschwarzwald Badenweiler Schweighof ⓘ Klemmbach quarry (Schweighof quarry)	[Opal, Opal-AN] Weiß (1990)
Bötzingen ⓘ Fohberg Quarry (Hauri Quarry)	[Opal, Opal-AN, Opal-AN var: Hyalite] Fricke (1988)
ⓘ Eisenbach	[Opal, Opal-AN] Walenta (1992)
Ihringen ⓘ Föhrenberg	[Opal, Opal-AN] Aufschluss 1988 (2)
Vogtsburg im Kaiserstuhl Burkheim ⓘ Humberg quarries	[Opal, Opal-AN]
Oberbergen ⓘ Pulverbuck	[Opal] Weiß (1990)
Oberrotweil ⓘ Kirchberg Quarry	[Opal, Opal-AN] Fricke (1988)
Emmendingen Sasbach am Kaiserstuhl ⓘ Eichert	[Opal, Opal-AN] Bega photo
ⓘ Limberg Quarries	[Opal, Opal-AN]
ⓘ Quarry I	[Opal, Opal-AN var: Hyalite] Hentschel (1976)
ⓘ Quarry II	[Opal, Opal-AN var: Hyalite] Volker Betz and Peter Lof collections ...
ⓘ Quarry VII	[Opal, Opal-AN var: Hyalite] Locality description
Freiburg im Breisgau Kappel Schauinsland ⓘ Roggenbach vein	[Opal, Opal-AN] Weiß (1990)
Konstanz Singen ⓘ Hohentwiel	[Opal] Lapis 1978 (1)
Lörrach Malsburg-Marzell ⓘ Malsburg	[Opal, Opal-AN] 70. +1 other reference
Schönau im Schwarzwald ⓘ Sengalenkopf	[Opal, Opal-AN] Walenta (1992)
Todtnau ⓘ Lisbühl	[Opal, Opal-AN] www.mineralienatlas.de (2021)
Ortenaukreis Haslach im Kinzigtal Haslach im Kinzigtal ⓘ Segen Gottes Mine (Gottes Segen Mine; Gottessegen Mine)	[Opal, Opal-AN] Schmeltzer (1993) +1 other reference
Hornberg ⓘ Offenbach valley	[Opal, Opal-AN] Walenta (1998)
Oberwolfach ⓘ Clara Mine	[Opal, Opal-AN] Walenta (1992)
Waldshut St Blasien Menzenschwand Vorderdorf ⓘ Granite quarry (Schleifbach quarry)	[Opal, Opal-AN] Weiß (1990)
Waldshut-Tiengen Detzeln ⓘ Porphyry quarry	[Opal, Opal-AN] Hanneberg et al. (2009) +1 other reference
Karlsruhe Region Freudenstadt Bad Rippoldsau-Schapbach Wildschapbach valley ⓘ Friedrich-Christian Mine	[Opal, Opal-AN] Walenta (1992)
Rhein-Neckar-Kreis Schriesheim Ursenbach ⓘ Ursenbach Mine	[Opal, Opal-AN] Weiß (1990)
Wiesloch ⓘ Schwetzinger Straße slag locality	[Opal] Himmel et al. (1933)
Bavaria Lower Bavaria Freyung-Grafenau District Röhrnbach ⓘ Steinerleinbach Quarry	[Opal, Opal-AN] Habel (2009)
Waldkirchen Oberfrauenwald ⓘ Eitzing Quarry	[Opal, Opal-AN var: Hyalite] Habel et al. (1994)
Passau District Untergriesbach ⓘ Ficht Mine	[Opal, Opal-AN] Weiß (1990)
ⓘ Grögöd Quarry (G'steinert Quarry)	[Opal, Opal-AN] Habel (2007)
ⓘ Steinhag marble quarry	[Opal] Weiß (1990)
Vilshofen ⓘ Wimhof Quarry	[Opal] Weiß (1990)
Regen District Bodenmais ⓘ Silberberg Mine	[Opal] Obermüller (1993)
Zwiesel Rabenstein ⓘ Hühnerkobel Mine (Hennenkobel Mine)	[Opal, Opal-AN var: Hyalite] Habel (2006)
Lower Franconia Aschaffenburg District Sailauf Hartkoppe ⓘ Fuchs Quarry	[Opal]
Haßberge District Maroldsweisach ⓘ Zeilberg Quarry	[Opal, Opal-AN] Wittern (2001)
Upper Franconia Hof District Köditz ⓘ Siebenhitz	[Opal, Opal-AN] F. Müller: "Bayerns steinreiche Ecke" et al. (Hof)
Rehau Wurlitz ⓘ Heß quarry	[Opal, Opal-AN] Rost (1949)
Wunsiedel im Fichtelgebirge Arzberg ⓘ Arzberg iron mines	[Opal] Hanneberg et al. (2009) +1 other reference
Kirchenlamitz ⓘ Epprechtstein	[Opal, Opal-AN] Weiß (1990)
Weißenstadter Forst-Nord ⓘ Streuspitz	[Opal] Wittern (2001)
Wunsiedel Schönbrunn ⓘ Acherwiese	[Opal, Opal var: Wax Opal] F. Müller: "Bayerns steinreiche Ecke" (1984)
Upper Palatinate Amberg-Sulzbach District Auerbach in der Oberpfalz ⓘ Leonie Mine	[Opal, Opal-AN] Neschen (n.d.)
Cham District Wald Roßbach ⓘ Himmelleiten Quarry	[Opal, Opal-AN] Eigler et al. (1982) +1 other reference
Neustadt an der Waldnaab District Flossenbürg ⓘ Granite quarries	[Opal, Opal-AN] Weiß (1990)
Waidhaus ⓘ Silbergrube	[Opal, Opal-AN] Luetcke (n.d.)
Tirschenreuth District Kulmain ⓘ Zinster Kuppe	[Opal, Opal-AN] Weiß (1990)
Pechbrunn ⓘ Ochsentränk	[Opal var: Cacholong] ...
Waldershof Schurbach ⓘ Granite quarries	[Opal] Meier (2001)
Berlin Spandau ⓘ Siemensstadt	[Amber] Michael Meder collection
Brandenburg Barnim Eberswalde Ruhlsdorf ⓘ Gravel quarry	[Amber] Wittern (2001)
Dahme-Spreewald Königs Wusterhausen Niederlehme ⓘ Sand & Mortar works quarry	[Amber] Gerstenberg (n.d.)
Märkisch-Oderland Bad Freienwalde ⓘ Clay pit	[Amber] Gerstenberg (n.d.)
Rüdersdorf bei Berlin ⓘ Limestone quarries	[Amber] Jahn (2013)
Hesse Darmstadt Bergstraße Bensheim Auerbach ⓘ Linck marble works	[Opal] Weiß (1990)
Gorxheimertal Gorxheim ⓘ Goldloch Shaft	[Opal] Weiß (1990)
Lautertal (Odenwald) Raidelbach Katzenstein ⓘ Point 18.0	[Opal] Collection of Steffen Michalski
Reichenbach Borstein ⓘ Point 6.1	[Opal] Collection of Steffen Michalski
Hohenstein ⓘ Point 16.1	[Opal, Opal-AN]
Darmstadt-Dieburg Otzberg ⓘ Hering	[Opal] Nickel et al. (1985)
Roßdorf ⓘ Roßberg Quarry	[Opal, Opal-AN] Weiß (1990)
Frankfurt ⓘ Bockenheim	[Opal, Opal-AN var: Hyalite] Jordan (1803)
Main-Kinzig-Kreis Hanau ⓘ Großauheim	[Opal, Opal-AN] Weiß (1990)
Neuberg ⓘ Rüdigheim	[Opal, Opal-AN, Opal-AN var: Hyalite] Collection of Volker Betz
Odenwaldkreis Reichelsheim ⓘ Ober-Ostern	[Opal] Weiß (1990)
Offenbach Mühlheim am Main Dietesheim ⓘ Basalt quarries	[Opal, Opal-AN] Weiß (1990)
Wetteraukreis Butzbach ⓘ Griedel	[Opal, Opal-AN var: Hyalite] www.zobodat.at (2022)
Echzell Bingenheim ⓘ Basalt quarry	[Opal, Opal-AN] Weiß (1990)
Nidda ⓘ Hohenstein quarry	[Opal, Opal-AN] Ehrenberg et al. (1982)
Ober-Widdersheim ⓘ Ober-Widdersheim quarry	[Opal, Opal-AN]
Reichelsheim Blofeld ⓘ Basalt quarry	[Opal, Opal-AN] Weiß (1990)
Giessen Region Giessen Biebertal Königsberg ⓘ Dünsberg	[Opal] Weiß (1990)
Buseck Großen-Buseck ⓘ Attenberg quarry	[Opal] Weiß (1990)
Hungen Langd ⓘ Maykranz Quarry	[Opal, Opal-AN]
Laubach Gonterskirchen ⓘ Basalt quarry	[Opal] Weiß (1990)
Pohlheim Hausen ⓘ Schiffenberg quarry	[Opal, Opal-AN] Weiß (1990)
Rabenau Londorf ⓘ Kahlenberg quarry	[Opal, Opal-AN] Weiß (1990)
Vogelsbergkreis Herbstein ⓘ Herbstein basalt quarry (Schrimpf basalt quarry)	[Opal, Opal-AN]
Homberg Nieder-Ofleiden ⓘ Hochberg quarry (Hohenberg quarry)	[Opal] Weiß (1990)
Lower Saxony Celle District Faßberg ⓘ Niederohe (Nieder-Ohe)	[Opal] Reinsch (1985)
ⓘ Oberohe (Ober-Ohe)	[Opal] Reinsch (1985)
Goslar District Braunlage ⓘ St Andreasberg	[Opal]
ⓘ Roter Bär Mine	[Opal] SEM-EDS and Wet Chemical by Joy Desor
Clausthal-Zellerfeld Oberschulenberg ⓘ Glücksrad Mine	[Opal] Wittern et al. (1986)
Goslar ⓘ Großfürstin Alexandra Mine	[Opal] 70. +1 other reference
Göttingen District Adelebsen ⓘ Bramburg Quarry	[Opal] Weiß (1990)
Mecklenburg-West Pomerania Vorpommern-Greifswald Usedom Island Loddin ⓘ Stubbenfelde	[Amber] Wittern (2001)
North Rhine-Westphalia Arnsberg Siegen-Wittgenstein Neunkirchen Hohenseelbachskopf ⓘ Basalt quarry	[Opal] Haege (1887)
Salchendorf ⓘ Basanite quarry	[Opal, Opal-AN] Klein (1999)
Cologne Aachen Alsdorf ⓘ Anna mine	[Opal] in: Stracher +1 other reference
Bonn Bad Godesberg ⓘ Lyngsberg (Lühnsberg; Lünsberg)	[Opal, Opal-AN] Brauns (1922)
Beuel Oberkassel ⓘ Rabenlay (Rabenley)	[Opal] Dechen (1852)
ⓘ Finkenberg	[Opal] Brauns (1922)
Rhein-Sieg-Kreis Königswinter ⓘ Stenzelberg	[Opal] Brauns (1922)
ⓘ Weilberg (Großer Weilberg)	[Opal] Brauns (1922)
Wintermühlenhof ⓘ Quegstein	[Opal] Gerstenberg (n.d.)
Rhineland-Palatinate Donnersbergkreis Winnweiler Imsbach ⓘ Grüner Löwe Mine	[Opal] Noll (1984)
ⓘ Katharina I Mine	[Opal] Noll (1984)
ⓘ Katharina II Mine	[Opal] Wittern (2001)
ⓘ Weiße Grube	[Opal] Wittern (2001)
Kusel Kusel-Altenglan Reichweiler ⓘ Karrenberg Quarry	[Opal] MÜLLER (1990)
Lauterecken-Wolfstein Hinzweiler ⓘ Hohe Buche	[Opal] Weiß (1990)
Mayen-Koblenz Mendig Bell ⓘ Rothenberg Quarry	[Opal, Opal-AN var: Hyalite] Hentschel (1987) +1 other reference
Mendig ⓘ In den Dellen quarries	[Opal] Hentschel (1990)
ⓘ Thelenberg	[Opal] Hentschel (1990)
Wingertsberg ⓘ Pumice quarries	[Opal] Hentschel (1990)
Pellenz Kruft ⓘ Krufter Ofen	[Opal] Hentschel (1990)
Vordereifel Ettringen ⓘ Caspar quarry	[Opal, Opal-AN] Blaß et al. (1992)
ⓘ Xenolith CS-029	[Opal] in the collection of Christof Schäfer
Neuwied Unkel Rheinbreitbach ⓘ Virneberg Mine	[Opal] Weiß (1990)
Rhein-Lahn-Kreis Aar-Einrich Biebrich ⓘ Neumühlberg quarry (Steinsberg quarry)	[Opal, Opal-AN] Weiß (1990)
Vulkaneifel Daun Oberstadtfeld ⓘ Kahlenberg	[Opal, Opal-AN] Hentschel (1987)
Üdersdorf ⓘ Emmelberg	[Opal, Opal-AN] ko.jansen
Gerolstein Hillesheim ⓘ Graulay quarry	[Opal, Opal-AN] Blaß et al. (2013)
ⓘ Kyller Höhe	[Opal, Opal-AN] Hentschel (1987)
Hohenfels-Essingen ⓘ Feuerberg	[Opal, Opal-AN var: Hyalite] Juroszek et al. (Ti 5 Fe) +1 other reference
Oberehe-Stroheich ⓘ Döhmberg	[Opal, Opal-AN] Hentschel (1987)
Walsdorf ⓘ Goßberg	[Opal, Opal-AN] Hentschel (1987)
Saarland Sankt Wendel Nonnweiler Kastel ⓘ Kloppberg Quarry	[Opal] Thomas Kleser & Erwin Ecker Collections
Saxony-Anhalt Anhalt-Bitterfeld ⓘ Bitterfeld-Wolfen	[Amber] Rappsilber (2022)
Bitterfeld ⓘ Goitzsche open cast	[Amber] Schellhorn (1993) +2 other references
Burgenlandkreis Hohenmölsen ⓘ Profen Nord opencast	[Amber] Krumbiegel et al. (2010) +1 other reference
Harz Harzgerode Güntersberge ⓘ Hirschbüchenkopf Mine	[Opal] Thomas Lühr
Quedlinburg Gernrode Hagental ⓘ Hohe Warte Mine	[Opal] Thomas Lühr Collection
Wernigerode Hasserode ⓘ Das Aufgeklärte Glück Mine (Aufgeklärtes Glück Mine)	[Opal] Wittern (2001)
ⓘ St Georg Mine (Goslar'sche Gleie)	[Opal] Th.Lühr collection
Saalekreis Petersberg ⓘ Goethe Quarry	[Opal] Wittern (2001)
ⓘ Petersberg Quarry	[Opal] Wittern (2001)
Saxony ⓘ Annaberg mining district	[Opal] Hofmann (1992)
Bautzen District Oßling ⓘ Oßling Quarry	[Opal] Wittern (2001)
Weißenberg ⓘ Gröditz	[Opal] Witzke et al. (2006)
Wittichenau ⓘ Dubring Quarry	[Opal] Wittern (2001)
Erzgebirgskreis Bärenstein Niederschlag ⓘ Straßburger Glück Mine	[Opal] Martin et al. (1994)
Ehrenfriedersdorf ⓘ Sauberg Mine	[Opal] Wittern (2001)
ⓘ Eibenstock	[Opal, Opal var: Alumocalcite] Frenzel (1874)
Blauenthal ⓘ Fahsel quarry	[Opal, Opal var: Milk Opal] Tröger (2009)
ⓘ Himmelfahrt Mine	[Opal] Wittern (2001)
Sosa Riesenberg ⓘ Friedrich August adit	[Opal, Opal var: Cacholong] Lapis 33 (10)
ⓘ Johanngeorgenstadt	[Opal] Frenzel (1874)
Schneeberg Neustädtel ⓘ Wald Shaft	[Opal] Lapis 30 (7/8)
Schwarzenberg Crandorf ⓘ Shaft 235 (Weißer Hirsch mine)	[Opal] Gröbner et al. (2006) +1 other reference
Pöhla ⓘ Pöhla-Tellerhäuser Mine	[Opal] Wittern (2001)
ⓘ Prospect 24	[Opal] Gerstenberg (n.d.)
Stützengrün ⓘ Opal occurrence	[Opal] Bartnik (1998)
Görlitz District Kodersdorf Rengersdorf ⓘ Hochstraße fields	[Opal, Opal-AN] Witzke et al. (1993)
ⓘ Königshain	[Opal, Opal-AN] www.minmax.net
Neißeaue ⓘ Emmerichswalde	[Opal] Witzke et al. (2013)
Ostritz ⓘ Steinberg basanite quarry	[Opal] Mineralienatlas.de
Mittelsachsen Brand-Erbisdorf ⓘ Vereinigt Feld Mine	[Opal] Frenzel (1874)
Claußnitz Diethensdorf ⓘ Diethensdorf Quarry	[Opal] Wittern (2001)
ⓘ Freiberg	[Opal] - (1986)
Hartmannsdorf ⓘ Ratssteinbruch	[Opal] Vollstädt (1979)
ⓘ Leisnig	[Opal, Opal var: Precious Opal, Opal var: Wax Opal] H. Vollstädt et al. (Dresden)
Sächsische Schweiz-Osterzgebirge Altenberg ⓘ Tin mine	[Opal] Jahn (1999)
Vogtlandkreis Lengenfeld Pechtelsgrün ⓘ Wolframite mine	[Opal] Weber (1992)
ⓘ Tirpersdorf	[Opal, Opal-AN] Gröbner et al. (2007) +1 other reference
Schleswig-Holstein Herzogtum Lauenburg Groß Pampau ⓘ Ohle & Lau gravel pit	[Amber] Wittern (2001)
Nordfriesland Sylt Island Kampen ⓘ Rotes Kliff	[Amber] Wittern (2001)
Plön Rastorf ⓘ Hoheneichen gravel works	[Opal] Wittern (2001)
Thuringia Greiz District Ronneburg ⓘ Lichtenberg open cast	[Amber] Gerstenberg (n.d.)
Weida ⓘ Loitsch Quarry	[Opal] Hanneberg et al. (2009) +1 other reference
Saale-Orla District Wurzbach Weitisberga ⓘ Henneberg Quarry	[Opal] Wittern (2001)

Greece
Attica East Attica Lavreotiki Agios Konstantinos (Kamariza) ⓘ Kamariza mines (Kamareza mines)	[Opal, Opal-AN] Ritter (1978)
Plaka Paliokamariza Mines (Paleokamariza Mines) ⓘ Paliokamariza Mine No. 18	[Opal, Opal-AN, Opal-AN var: Hyalite] Rieck (n.d.)
Central Macedonia Chalkidiki Polygyros ⓘ Ormylia mine	[Opal] Sideridis et al. (2022)
ⓘ Vavdos mine	[Opal] Sideridis et al. (2022)
Eastern Macedonia and Thrace Evros Alexandroupoli ⓘ Perama Hill deposit	[Opal, Opal var: Opaline] Voudouris et al. (2007)
Rhodope Maroneia-Sapes ⓘ Mavrokoryfi prospect	[Opal, Opal var: Opal-CT] Voudouris (2005) +1 other reference
Ionian Islands Lefkada Lefkada island ⓘ Agios Petros	[Opal] Stamatakis et al. (1993)
ⓘ Kastos island	[Opal] Bourli et al. (2021)
North Aegean Lesbos ⓘ Mytilene	[Opal, Opal-AN] Christophos
Samos Eastern Samos ⓘ Mytilinii Basin	[Opal, Opal var: Opal-CT] Helvaci et al. (1993)
Western Samos ⓘ Karlovassi basin	[Opal] Stamatakis (1989)
South Aegean Milos Kimolos Kimolos Island ⓘ Prassa Quarry (Bentomine S.A. Quarry)	[Opal, Opal var: Opal-CT] Godelitsas +1 other reference
Milos Island ⓘ Chondro Vouno	[Opal, Opal-AN]
ⓘ Paliochori beach (Paleochori bay)	[Opal] Balić-Žunić et al. (2016)
ⓘ Profitis Ilias Au deposit	[Opal] Kilias et al. (2001)
ⓘ Off-shore hydrothermal vents	[Opal] Nomikou et al. (2025)
Thira Santorini Island Santorini Caldera ⓘ Nea Kameni Island	[Opal] Balić-Žunić et al. (2016)
Thessaly Larissa Elassona ⓘ Sarantaporo-Elassona basin	[Opal] Stamatakis et al. (2001)
Western Greece Achaea West Achaea ⓘ Araxos	[Opal] Pe-Piper et al. (2021)

Greenland
Avannaata Nuussuaq Peninsula Niaqornat ⓘ Reyerite type locality	[Opal] Petersen et al. (2005)
Kujalleq Igaliku Narsaarsuk Plateau ⓘ Narssârssuk pegmatite	[Opal]
Ilímaussaq complex ⓘ Kuannersuit Plateau (Kvanefjeld) ?	[Opal] Petersen et al. (2002)
Qeqertalik Disko Island ⓘ Qarusuit ?	[Opal] Bøggild (1953)

Honduras	[Opal, Opal var: Fire Opal, Precious Opal var: Opal Matrix]

Gracias a Dios Department ⓘ Gracias a Dios Mine	[Opal, Opal var: Precious Opal] Lavinsky (n.d.)
Lempira Department ⓘ Erandique	[Opal] Prüfer (2002)
ⓘ Tablon Mine	[Opal, Precious Opal var: Black Opal] Wayne Osborne Collection
ⓘ Gracias	[Opal, Precious Opal var: Black Opal] N. Jb. Mineral. Abh. 186 (2009)
San Andrés Sosoal ⓘ Las Colinas deposits	[Opal] Sinkankas (1976)
Santa Bárbara Department Azacualpa ⓘ San José Lepasite river	[Opal] Sinkankas (1976)

Hungary	[Opal, Opal var: Pitch Opal, Opal var: Precious Opal, Precious Opal var: Black Opal]

Borsod-Abaúj-Zemplén County Gönc District Abaújszántó ⓘ Sulyom Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
ⓘ Süveges Hill	[Opal] Szakáll: Topographia Mineralogica ...
Arka ⓘ Arka Brook Valley	[Opal]
ⓘ Boldogkőváralja	[Opal] Szakáll & Gatter: Hungarian Mineral ...
ⓘ Borsó Hill	[Opal, Opal var: Milk Opal]
ⓘ Dobogó Hill	[Opal]
ⓘ Fenyőkő Hill	[Opal] Szakáll & Jánosi. Minerals of Hungary
Fony ⓘ Csonkás	[Opal] Szakáll et al. (1996)
Golop ⓘ Somos	[Opal, Opal-AN]
Hejce ⓘ Gergely Hill	[Opal] Szakáll et al. (1996)
ⓘ Helle dűlő	[Opal, Opal-AN, Opal var: Milk Opal] Koch (1985)
Kéked ⓘ Hasdát Valley	[Opal] Szakáll & Weiszburg: Telkibánya ( Top. Min. Hun.)
Regéc ⓘ Vár Hill	[Opal] Sándor et al. (2005)
ⓘ Telkibánya	[Opal] Topographia Mineralogica Hungariae II. ...
ⓘ Gordon Hill	[Opal]
ⓘ Gyepü Hill	[Opal] Szakáll & Weiszburg: Telkibánya
ⓘ Korpa Hill	[Opal]
ⓘ Medve Hill	[Opal]
ⓘ Ósva Valley	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Honey Opal, Opal var: Milk Opal, Opal var: Precious Opal, Opal var: Wax Opal, Precious Opal var: Black Opal, Precious Opal var: White Opal] Szakáll & Weiszburg: Telkibánya
ⓘ Sinta Hill	[Opal] Szakáll-Gatter: Hungarian Mineral ...
Sárospatak District ⓘ Bot-kő	[Opal] Szakáll et al. (1996)
ⓘ Csurgókúti Quarry	[Opal] Szakáll et al. (1996)
ⓘ Erdőhorváti	[Opal, Opal var: Gold Opal]
ⓘ Agáros Hill	[Opal, Opal-AN, Precious Opal var: Black Opal]
ⓘ Prücsök Hill	[Opal]
ⓘ Tetőcske	[Opal, Precious Opal var: Black Opal] Szakáll & Gatter: Hungarian Mineral ...
ⓘ Vég Hill	[Opal] Koch (1985)
ⓘ Király Hill	[Opal, Opal var: Milk Opal]
Komlóska ⓘ Bolhás Hill	[Opal]
ⓘ Nagy-Egres Brook	[Opal, Precious Opal var: Black Opal] Koch (1985)
ⓘ Szkalka Hill	[Opal] Szakáll et al. (1996)
ⓘ Szemince	[Opal]
Sátoraljaújhely District Bózsva ⓘ Fekete Hill	[Opal] Collection of Gábor _Mesics
ⓘ Senyő Valley	[Opal] Szakáll et al. (1996)
Füzérradvány ⓘ Korom Hill	[Opal] Szakáll et al. (1996)
Hollóháza ⓘ Ökör Hill	[Opal]
Nagyhuta ⓘ Borzás	[Opal] Szakáll et al. (1996)
ⓘ Káváskúti Valley	[Opal, Opal-AN] Szakáll et al. (1996)
Nyíri ⓘ Kandó Hill	[Opal] Szakáll & Gatter: Hungarian Mineral ...
Szerencs District Legyesbénye ⓘ Fuló Hill	[Opal, Opal-AN, Precious Opal var: Black Opal] Szakáll:Top. Min. Hun.
ⓘ Zsidótemető	[Opal] Szakáll: Minerals of Szerencsi Hills (Top. Min. Hun.)
Mád Király Hill ⓘ Suba quarry	[Opal, Opal var: Opal-CT] Society of Economic Geologists Student Chapter University of Miskolc (2018)
Megyaszó ⓘ Hosszú Hill	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Milk Opal, Opal var: Precious Opal, Precious Opal var: Black Opal]
ⓘ Nagy Répás Hill	[Opal, Opal var: Fire Opal]
ⓘ Monok	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Precious Opal] Betts (n.d.)
ⓘ Csörgő Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
ⓘ Fekete Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
ⓘ Ingvár	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Milk Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Szakáll: Topographia Mineralogica ...
ⓘ Kálvária Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
ⓘ Kaptár Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
ⓘ Pipiske	[Opal] Szakáll: Mineralogica Topographia ...
ⓘ Tetlinke Ditch	[Opal]
ⓘ Zsebrik	[Opal] Szakáll:Top. Min. Hun.
Rátka ⓘ Hercegköves Hill	[Opal] Szakáll:100 Hungarian Mineral ...
Szerencs ⓘ Közép Hill	[Opal, Opal-AN] Szakáll: Topographia Mineralogica ...
Tokaj District ⓘ Csurgókúti Quarry	[Opal] Szakáll et al. (1996)
ⓘ Erdőbénye	[Opal] Koch: Minerals of Hungary
ⓘ Aranyos Valley	[Opal]
ⓘ Ligetmajor	[Opal, Opal-AN] geomania.hu (2011)
ⓘ Mogyorósok	[Opal] Sándor et al. (2005)
ⓘ Mulató Hill	[Opal, Opal-AN, Opal var: Milk Opal, Opal var: Opal-C, Opal var: Opal-CT, Opal-AN var: Hyalite]
ⓘ Nagy Hill	[Opal, Opal-AN]
Tarcal ⓘ Kopasz Hill andesite quarry	[Opal, Opal-AN, Opal var: Milk Opal, Opal-AN var: Hyalite, Precious Opal var: Black Opal] www.geomania.hu (2013)
ⓘ Tolcsva	[Opal] Koch: Minerals of Hungary
ⓘ Rudnok Hill	[Opal] Koch (1985)
Fejér County Gárdony District Pázmánd ⓘ Zsidó Hill	[Opal] Szakáll & Jánosi: Minerals of Hungary
Sárszentmiklós ⓘ Tuff Quarry	[Opal] Szakáll: 100 Hungarian Mineral Locality
Székesfehérvár District Kőszárhegy ⓘ Kőszárhegy Quarry	[Opal] Szakáll et al. (1996)
Heves County Bélapátfalva District ⓘ Mikófalva	[Opal] GEODA 2004
Gyöngyös District ⓘ Bába- kő	[Opal] Sándor et al. (2005)
ⓘ Gyöngyösoroszi	[Opal]
ⓘ Bagolyvár-Furmin	[Opal]
ⓘ Bánya Hill	[Opal] GEODA 2002
ⓘ Jegykő brook valley	[Opal] Szakáll & Jánosi. Minerals of Hungary
ⓘ Károlyvár	[Opal, Opal-AN] Own found
Gyöngyöspata ⓘ Aranyos-bérc & Korlát-bérc	[Opal] www.geomania.hu (2013)
ⓘ Prédikáló-tető	[Opal, Opal-AN] www.geomania.hu (2013)
Gyöngyössolymos ⓘ Asztag kő	[Opal, Opal-AN] Sándor et al. (2005)
ⓘ Cserkő Mine	[Opal]
ⓘ Eremény Hill - Bárdos Hill	[Opal, Opal-AN] geomania.hu (2013)
ⓘ Kis Hill (Lila Mine)	[Opal]
ⓘ Száraz-patak	[Opal] Book: 100 collecting sites of Hungary
ⓘ Szén-patak Cseternás-bérc	[Opal, Opal-AN] Körmendy Regina (2011)
ⓘ Üstökfő	[Opal] MAMIT
ⓘ Gyöngyöstarján	[Opal, Opal-AN] T Ungvári collection
ⓘ Csege brook Valley	[Opal] Geoda
ⓘ Fajzatpuszta	[Opal] Szakáll-Jánosi: Minerals of Hungary
ⓘ Füledugó Quarry	[Opal, Opal-AN, Opal var: Fire Opal] GEODA/2000
ⓘ Hársas Hill	[Opal, Opal-AN] www.geomania.hu (2013)
ⓘ Kis-domb	[Opal] GEODA/1997
ⓘ Köves Hill	[Opal] Sándor et al. (2005)
Kisnána ⓘ Hátsó Tarnóca Quarry	[Opal, Opal-AN] Dávid Szabó
Markaz ⓘ Mraznica-tető-Sas-kő	[Opal] www.mineral.hermuz.hu (2003)
Mátraszentimre ⓘ Szent Imre Mine	[Opal] Szakáll et al. (1996)
Mátraszentlászló ⓘ Oszicsinszki Hill	[Opal] GEODA/2005
Pétervására District Mátraderecske ⓘ Kanázsvár	[Opal] Szakáll & Jánosi. Minerals of Hungary
Recsk ⓘ Csákány kő	[Opal, Opal-AN] Sándor et al. (2005)
Nógrád County Bercel ⓘ Bercel Hill	[Opal] Szakáll et al. (1996)
ⓘ Buják	[Opal] Lemanski (n.d.)
ⓘ Felsőpetény	[Opal, Opal-AN]
ⓘ Mátrakeresztes	[Opal] Sándor et al. (2005)
ⓘ Szalajkás Hill	[Opal]
Nagylóc ⓘ Nagy-Zsunyi Hill quarry (Zunypuszta quarry)	[Opal] Szakáll et al. (1996)
ⓘ Nógrádszakál	[Opal] GEODA 2004
Sámsonháza ⓘ Fehér -kő	[Opal] Szakáll et al. (1996)
Szanda ⓘ Szanda Hill	[Opal] GEODA 2004
Szurdokpüspöki ⓘ Diatoma Mine	[Opal] Szakáll: 100 Hungarian Mineral Locality
ⓘ Tolmács	[Opal]
Pest County Szentendre District ⓘ Száraz brook	[Opal] Szakáll: 100 Hungarian Mineral Locality
Szob District Szokolya Öl Hill ⓘ Jacoby adit	[Opal] Sándor Szakáll (2004)
Verőce ⓘ Fehér Valley	[Opal, Opal var: Opal-A, Opal var: Opal-CT] Kiss et al. (2020)
Veszprém County ⓘ ~~Ajka District~~	[Amber] Zechmeister (1926) +1 other reference
Balatonfüred District ⓘ Csopak	[Opal] Kiss et al. (2006)
Tapolca District Nemesgulács ⓘ Gulács Hill	[Opal] Szakáll et al. (1996)
ⓘ Csúcs Quarry	[Opal] Szakáll & Jánosi. Minerals of Hungary
Uzsa ⓘ Láz Hill mine	[Opal] Bortolozzi (n.d.)
Várpalota District Várpalota ⓘ Inota-Puszta	[Opal] Szakáll et al. (1996)
Veszprém District ⓘ Szentgál	[Opal] Koch (1985)
Zala County Keszthely district Cserszegtomaj ⓘ Pajtika Hill	[Opal] Koch (1985)

Iceland
Eastern Region ⓘ Breiðdalur- Berufjörður area	[Opal] Betz (1981)
Northeastern Region Þingeyjarsveit Skútustaðahreppur Myvatn Námaskarð Geothermal Area ⓘ Hverir fumarole	[Opal] Mineralogy and bulk geochemistry of a ...
Southern Region Bláskógabyggð Haukadalur geothermal area ⓘ Geysir	[Opal, Opal var: Opal-CT] JONES et al. (2007)
Vestmannaeyjar Vestmannaeyjar archipelago (Westman islands) Heimaey Island ⓘ Eldfell Volcano	[Opal] Balić-Žunić et al. (2016)
Surtsey Island ⓘ Grillid (Cave S-4)	[Opal] Jakobsson et al. (1992)
ⓘ Unnamed borehole	[Opal] JAKOBSSON et al. (1986) +1 other reference

India
Andhra Pradesh Visakhapatnam District ⓘ Kodúr Mines	[Opal] Rocks & Min.: 8:7.
Gujarat Surat district ⓘ Tadkeshwar mine	[Amber] www.bbc.co.uk (2010)
ⓘ Vastan Mine	[Amber] www.bbc.co.uk (2010)
Jharkhand East Singhbhum District Mosaboni ⓘ Rakha Cu deposit ?	[Opal] S. G. Tenainkai et al. (1991)
Maharashtra Chhatrapati Sambhajinagar Division (Aurangabad Division) ⓘ Aurangabad - Jalna area	[Opal] Philip Bluemner Collection
Nashik Division Jalgaon District Sawade Pr Chandsar ⓘ Savda	[Opal, Opal var: Opal-CT] Gotze +7 other references
Nashik District Sinnar ⓘ Mahodari quarry	[Opal] White (2008)
Pune Division Pune District Wagholi ⓘ Wagholi Quarries	[Opal] Ottens et al. (2025)

Indian Ocean
Carlsberg Ridge Daxi hydrothermal field ⓘ NE Mound	[Opal, Opal var: Opal-A] Yang et al. (2026)
Wocan Hydrothermal Field ⓘ Wocan I	[Opal, Opal var: Opal-CT] Wang et al. (2017)
ⓘ Black Smoker Zone	[Opal] Cai et al. (2024)
ⓘ Mulberry Forest	[Opal] Cai et al. (2024)
ⓘ Southern Mass Wasting	[Opal] Cai et al. (2024)
ⓘ Wocan II	[Opal, Opal var: Opal-CT] Wang et al. (2017)
Central Indian Ridge ⓘ Kairei Vent Field	[Opal] Wang et al. (2018)
Ninety East Ridge (90° E Ridge; Indian Ridge) D.S.D.P. Leg 26 ⓘ Site 253	[Opal] D. Besse et al.
Southwest Indian Ridge ⓘ BC‐10 station	[Opal] Linsy et al. (2023)
ⓘ Kairei vent field	[Opal, Opal var: Opal-A] Wang et al. (2014)
ⓘ Longqi vent field	[Opal] Wang et al. (2018)

Indonesia
Bali Province Bangli Regency ⓘ Batur Volcano	[Opal, Opal-AN] Rod Martin personal collection
Banten Province Lebak Regency ⓘ Cilayang village (Kali Maya)	[Opal, Opal var: Jelly Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Extra Lapis - English No. 10 Opal +1 other reference
Curugbitung Sub-District ⓘ Ciburuy Village	[Opal] Collection of Alex Earl
ⓘ Genting Formation	[Opal] Mustoe (2025)
Bengkulu Province Rejang Lebong District (Rediang Lebong District) ⓘ Tambang Sawah	[Opal] Barton et al. (1978)
Central Sulawesi Province Talau ⓘ Poboya Gold Mine	[Opal] Syafrizal et al. (2017)
East Java Province Banyuwangi Regency ⓘ Ijen volcano	[Opal] Lowenstern et al. (2018)
ⓘ Java	[Opal, Opal var: Fire Opal, Opal var: Precious Opal, Opal-AN var: Hyalite] Sujatmiko et al. (2007)
ⓘ Lampung Province	[Amber] Richard Gunter Collection.
Papua Province Mimika Regency Gunung Bijih District ⓘ West Grasberg Resource	[Opal] Prendergast (2003)
West Java Province Garut Regency ⓘ Papandayan volcano	[Opal, Opal var: Opal-CT] Mazot et al. (2007)

Iran
Isfahan Province Ardestan County ⓘ Band-e-Cherk ferromanganese occurrence	[Opal] Shahin et al. (2023)
Tehran Province ⓘ Kuh-e-Aradeh	[Opal] Bazargani-Guilani et al. (2004)

Israel
Haifa District Hadera Hof HaCarmel ⓘ Kebara Cave	[Opal] Weiner et al. (1993)
ⓘ Naftali Mountains	[Amber] Poinar (1992)
Northern District Jezreel Subdistrict Emek HaMaayanot Regional Council ⓘ Menahemiya (Menahamiya)	[Opal]
Safed Subdistrict Galil Elyon Regional Council ⓘ Lake Huleh Preserve	[Opal] Cowgill (1989)
ⓘ Qiryat Shemona	[Amber] Poinar (1992)
Southern District Ashkelon Subdistrict Hof Ashkelon Regional Council ⓘ Kokhav	[Amber] Poinar (1992)
Beersheba Subdistrict ⓘ Arad	[Opal] Allan W. Eckert (1997)
Arava Tichona Regional Council ⓘ Scorpions Pass	[Opal]
ⓘ Barboor	[Amber] Poinar (1992)
Tamar Regional Council ⓘ Arad Mine	[Opal] Tonsuaadu et al. (2000) +1 other reference
Hatrurim Basin Gurim anticline ⓘ Clastic dikes	[Opal, Opal var: Opal-CT] Sokol et al. (2014, November)
ⓘ Har Ye'elim	[Opal] Kruszewski et al. (2021)

Italy
Basilicata Potenza Province Melfi ⓘ Vallone Toppo di Lupo	[Opal] Bortolozzi (n.d.)
Calabria Metropolitan City of Reggio Calabria ⓘ Bivongi	[Opal, Opal-AN] samples in Messina University and ...
ⓘ Giogli Mine	[Opal, Opal-AN] Messina University collection +1 other reference
ⓘ Melito di Porto Salvo (Melito)	[Amber] Mantovani P. (1877) +1 other reference
Campania Metropolitan City of Naples Boscotrecase ⓘ Boscotrecase thermal area ("Tenorite pit")	[Opal] Parascandola (1959)
ⓘ Mount Vesuvius	[Opal, Opal var: Opal-C] Russo +1 other reference
Ottaviano ⓘ Vesuvius fumaroles on eastern crater rim	[Opal] Russo et al. (2011) +1 other reference
ⓘ Fumarole B5 ("Cotunnite pit")	[Opal] Campostrini et al. (2019)
Pozzuoli ⓘ Antiniana (Scarfoglio)	[Opal] Russo et al. (2017)
ⓘ Pisciarelli di Agnano	[Opal] Russo M. (1984)
ⓘ Solfatara di Pozzuoli	[Opal] Pichler et al. (1970)
ⓘ "Bocca Grande" fumarole	[Opal] Russo et al. (2017)
Torre del Greco ⓘ Vesuvius fumaroles at the crater bottom	[Opal] Russo et al. (2004) +1 other reference
ⓘ Vesuvius fumaroles	[Opal] Pelloux (1927) +7 other references
ⓘ Somma-Vesuvius Complex	[Opal] Pellino et al. (2025)
Emilia-Romagna Forlì-Cesena Province ⓘ Mercato Saraceno	[Amber] Bombicci (1890) +2 other references
Metropolitan City of Bologna Alto Reno Terme Granaglione ⓘ Lustrola	[Opal] Milani et al. (2016)
Loiano (Lojano) ⓘ Scanello	[Amber] Bombicci (1873) +3 other references
Monterenzio ⓘ San Clemente	[Amber] Bombicci (1873)
Modena Province Fiorano Modenese Nirano ⓘ Nirano badlands	[Opal] www.mineralimodenesi.it (n.d.)
Prignano sulla Secchia ⓘ Castelvecchio	[Amber] Malagoli (1884) +4 other references
Parma Province Berceto Corchia mine ⓘ Perboni Q. 750	[Opal] Adorni F. (1997)
ⓘ Rio Bassi Stope	[Opal] Adorni F. (1997)
Medesano Sant'Andrea Bagni ⓘ Case Montanini quarry	[Opal] Adorni et al. (2004)
ⓘ Faieto quarry	[Opal] Adorni et al. (2004)
Varano de' Melegari Montesalso ⓘ I Camilloni	[Amber] Adorni et al. (2010)
Rimini Province Sant'Agata Feltria ⓘ Marazzana Mine	[Opal] Bombicci (1894)
Friuli Venezia Giulia Pordenone Province Frisanco ⓘ Muiè Stream (Mujè Stream)	[Amber] Rimoli et al. (1998) +2 other references
Udine Province ⓘ Comeglians	[Opal] Bortolozzi (n.d.) +1 other reference
ⓘ Dogna	[Amber] Roghi G. et al. (2002) +2 other references
San Pietro al Natisone Vernasso ⓘ Vernasso Quarry	[Amber] Roghi G. et al. (2004) +2 other references
Lazio Latina Province Ponza Ponza Island ⓘ Cala Fontana old quarry	[Opal] E. Passaglia et al.
Metropolitan City of Rome Capital ⓘ Alban Hills	[Opal] Federico M.
Allumiere ⓘ Allumiere Quarries	[Opal] Negretti +2 other references
ⓘ Caldano creek	[Opal] I minerali del Museo Archeominerario "Klitsche de la Grange"Allumiere (2000)
ⓘ Monte Rovello	[Opal, Opal-AN, Opal var: Opal-CT] Napoleoni et al. (2021)
ⓘ Ariccia	[Opal] De Michele (1974)
Campagnano di Roma ⓘ Monte Cavalluccio	[Opal] Eur. J. Mineral.
Monte Compatri Laghetto (Laghetto di Montecompatri) ⓘ Laghetto quarries ?	[Opal] Carlini et al. (2018)
Rome Osteria dell'Osa ⓘ Osa Quarry ?	[Opal] Carlini et al. (2018)
Valleranello ⓘ Vallerano Quarries	[Opal] Bortolozzi (n.d.) +1 other reference
Tolfa ⓘ Sasso della Strega	[Opal, Opal-AN, Opal-AN var: Hyalite] Napoleoni et al. (2021)
Viterbo Province Capranica ⓘ Campo Padella	[Opal] Bortolozzi (n.d.)
ⓘ Cassia Road km 61.5	[Opal] Bortolozzi (n.d.)
ⓘ Ischia di Castro	[Opal] Di Domenico Dario
Montalto di Castro Pietra Massa Locality ⓘ Campomorto Quarry	[Opal, Opal-AN] Passaglia et al. (1982)
Onano ⓘ Montenero Quarry	[Opal] Bortolozzi (n.d.)
Viterbo ⓘ Poggio Nibbio	[Opal, Opal-AN] Begini (2022)
Liguria Genoa Arenzano Mt. Argentea ⓘ Fasciun	[Opal] Alessandro Cantamessa collection
Genoa Borzoli ⓘ Mt. Ramazzo Mine	[Opal] Giuseppe Pipino - L'antica miniera di ...
ⓘ Varenna Valley	[Opal] Antofilli et al. (1983)
Masone ⓘ I Piani	[Opal] Antofilli et al. (1983)
Ne ⓘ Cassagna Mine	[Opal] Bortolozzi (n.d.)
ⓘ Molinello Mine	[Opal] 415. +1 other reference
ⓘ Nascio	[Opal] Bortolozzi (n.d.)
Reppia ⓘ Gambatesa Mine	[Opal] Redazione (2005)
Imperia Province Ventimiglia ⓘ Monte Bellenda	[Amber] Issel (1892) +1 other reference
La Spezia Province Rocchetta di Vara ⓘ Monte Nero Mine	[Opal] probed by Balestra C.
Savona Province Sassello ⓘ Veirera	[Opal] Antofilli et al. (1985)
Lombardy Bergamo Province ⓘ San Martino Valley	[Opal] Maida (2002)
Pavia Province ⓘ Cigognola	[Opal] Barelli (1835) +1 other reference
Ponte Nizza ⓘ Pizzocorno	[Opal] Barelli (1835) +1 other reference
Sondrio Province Chiavenna ⓘ Tanno Pegmatitic Field	[Opal] Bedognè (1991)
Chiesa in Valmalenco ⓘ Sissone Valley	[Opal] Marchesini et al. (2025)
Grosio Grosina Valley ⓘ Stavalina	[Opal, Opal-AN] Tabacchi C. (1974) +1 other reference
Novate Mezzola ⓘ Munt Valley Quarries	[Opal] Ghizzoni et al. (2005)
Valdisotto ⓘ Cepina	[Opal] Romani et al. (1997) +1 other reference
Varese Province ⓘ Cuasso al Monte	[Opal] Boscardin M. (1972) +1 other reference
Cavagnano ⓘ Laghetto Quarry	[Opal] capponi Fulvio Piero collection. ...
ⓘ Puricelli Quarry	[Opal, Opal-AN] Fabio Brignoli collection
ⓘ Subalpina Quarry (Mantegazza Quarry; Gebel Quarry; Bianchi Quarry)	[Opal] - (as a monograph) +2 other references
Cuasso al Piano ⓘ Bonomi Quarry	[Opal] - (as a monograph) +2 other references
Marche Ancona Province Genga ⓘ Frasassi Caves (Grotte di Frasassi; Fiume-Vento karst system; Grotta del Fiume-Grotta Grande del Vento karst complex; Grotta Grande del Vento)	[Opal] Bertolani et al. (1976) +1 other reference
Macerata Province ⓘ Poggio San Vicino	[Opal] Del Caldo et al. (1973) +1 other reference
Piedmont Alessandria Province Molare Olbicella ⓘ Rio Pian del Foco	[Opal] Cortesogno L.
Asti Province Costigliole d'Asti Tanaro River ⓘ Motta fossil wood occurrence	[Opal] Ciriotti et al. (2024)
Tanaro River Costigliole d'Asti ⓘ Motta fossil wood deposit	[Opal] Ciriotti et al. (2024)
Biella Province Campiglia Cervo ⓘ Quittengo	[Opal] Piccoli et al. (2007)
San Paolo Cervo ⓘ Colombari quarry	[Opal] Martini et al. (2012)
ⓘ Vej della Balma	[Opal] Martini et al. (2012)
ⓘ Cervo Valley	[Opal] De Michele (1974)
Cuneo Province Bagnolo Piemonte ⓘ Montoso Quarries	[Opal] Bruno Marello find & collection
ⓘ Pravallino Quarry	[Opal] Bruno Marello find & collection
Bellino ⓘ Maniglia Mt. Mine	[Opal] Piccoli et al. (2007) +1 other reference
Canosio Vallone della Valletta ⓘ Valletta Mine	[Opal] Cámara et al. (2017)
Metropolitan City of Turin Balangero ⓘ Poggio San Vittore asbestos mine	[Opal] Prete (1995)
Baldissero Canavese Bettolino ⓘ Monti Pelati Nature Park	[Opal] Marinai & Scaini +1 other reference
Bussoleno Tignai ⓘ Tignai Quarry	[Opal] Piccoli et al. (2007)
Caselette ⓘ Calvo Mt. magnesite quarries (Caselette magnesite quarries)	[Opal] Jervis (1873) +7 other references
ⓘ Sant'Abaco	[Opal] Sanero (1932)
Cesana Torinese ⓘ Monte Cruzore (Monte Cruzeau)	[Opal] Parona (1892) +1 other reference
Condove ⓘ Civrari Mountain	[Opal] Alessandro Cantamessa find & collection
Givoletto Mt. Baron ⓘ Baron d’la Seil magnesite quarry	[Opal] Fenoglio et al. (1941)
Luserna San Giovanni ⓘ Seccarezze Quarries	[Opal, Opal-AN var: Hyalite] Collection Giuseppe Finello
ⓘ Luserna Stone Quarries	[Opal] Ambrino et al. (2009)
Mezzenile Pugnetto ⓘ Borna di Pugnetto (Grotta di Pugnetto)	[Opal, Opal-AN var: Hyalite] Curlo (1929)
ⓘ Musinè Mountain	[Opal] Jervis (1873) +7 other references
Oulx ⓘ "Bardonecchia road" quartzite vein	[Opal] Colomba (1900) +2 other references
ⓘ Piossasco	[Opal] Piccoli et al. (2007)
ⓘ San Valeriano quarry	[Opal] Gennaro (1931) +1 other reference
Viù ⓘ Fubina	[Opal] Airaudi et al. (2009)
Novara Province Pella ⓘ Alzo	[Opal, Opal-AN] Mariani P.
Verbano-Cusio-Ossola Province Baveno Oltrefiume Mount Camoscio ⓘ Seula mine	[Opal, Opal-AN] Albertini (1983)
Craveggia ⓘ Eglio	[Opal] Piccoli et al. (2007)
Rio Vasca ⓘ Piano del Lavonchio (Piano dei Lavonchi)	[Opal] Piccoli et al. (2007)
Crodo ⓘ Crodo gneiss quarries	[Opal] Mattioli (1979) +1 other reference
ⓘ Rencio quarries	[Opal] Piccoli et al. (2007)
Malesco ⓘ Val Loana serpentinite	[Opal] Boscardin et al. (2013)
Mergozzo ⓘ Mont'Orfano (Montorfano)	[Opal, Opal-AN var: Hyalite] Roggiani A.G. (1969) +2 other references
Nibbio ⓘ Nibbio-Val Faera (Nibbio-Val Fredda) pegmatites	[Opal] Mattioli V. (1979) +1 other reference
Montescheno ⓘ I Mondei (Ca' Mondei)	[Opal] Rivista Mineralogica Italiana (1)
Omegna Brughiere ⓘ Rio Inferno quarry	[Opal] Albertini (2000)
Premia Premia gneiss quarries ⓘ Cadarese Quarries	[Opal] Piccoli et al. (2007)
ⓘ Passo Quarries	[Opal] Piccoli et al. (2007)
ⓘ Verampio-Crego area	[Opal, Opal-AN] De Michele (1974)
Trontano Cosasca ⓘ Grignaschi Quarry	[Opal, Opal-AN] De Michele (1974)
ⓘ Rio Graia	[Opal] Mattioli (1976)
Sardinia Metropolitan City of Cagliari Capoterra ⓘ Arcu su Linnarbu	[Opal] Olmi F.
Nuoro Province ⓘ Macomer	[Opal] Vasco Trancoso collection
Oristano Province ⓘ Masullas	[Opal] Conti-Vecchi et al. (1991)
ⓘ Conca Cannas quarry	[Opal] Bortolozzi (n.d.)
ⓘ Montresta	[Opal, Opal-AN var: Hyalite] Bortolozzi (n.d.)
Sassari Province ⓘ Aggius	[Opal] Gamboni et al. (2006)
ⓘ Anglona	[Opal, Opal var: Opal-CT] Ghiara M.R. et al. (1999)
Arzachena Mt. Mazzolu ⓘ Lu Patenti Quarry	[Opal] Gamboni et al. (2012)
ⓘ Mt. Mazzolu Quarry	[Opal] S. Cuccuru (2011)
Calangianus ⓘ Furru e Conca Quarries	[Opal] Gamboni et al. (1997)
La Maddalena ⓘ Caprera Island	[Opal] Gamboni et al. (1996)
La Maddalena Island ⓘ Cala Francese Quarries	[Opal] Billows (1941)
ⓘ Spargi Island	[Opal] Gamboni et al. (1997) +1 other reference
ⓘ Nulvi	[Opal] Bortolozzi (n.d.)
Ozieri ⓘ Su Elzu	[Opal] Bortolozzi (n.d.)
Palau ⓘ Mt. Canu Quarries	[Opal] Gamboni A.
ⓘ Ploaghe	[Opal, Opal-AN] Antonio Gamboni collection
ⓘ Badde ia/Mt. Perucci-Selvani quarries	[Opal] Conti-Vecchi et al. (1991)
ⓘ Funtanedda Ulumu Quarry	[Opal] Gamboni et al. (2015)
Sant'Antonio di Gallura ⓘ Priatu Quarries	[Opal] Gamboni et al. (1998)
Telti ⓘ San Bachisio Quarries	[Opal] Gamboni et al. (2001)
Tempio Pausania Giogantinu and Balistreri Peaks ⓘ Mount Limbara	[Opal] Gamboni et al. (2006)
South Sardinia Province Domusnovas ⓘ Sa Duchessa Mine	[Opal] Bortolozzi (n.d.)
ⓘ Furtei	[Opal] Fernando Caboni et al. (2024)
ⓘ Furtei mine	[Opal] Fernando Caboni et al. (2024)
Gonnesa ⓘ Punta della Torre Mine	[Opal, Opal-AN var: Hyalite] Stara et al. (1996)
ⓘ Orroli	[Opal, Opal-AN] Conti-Vecchi G. Stara P. (1991)
San Vito ⓘ Bruncu Sciolas skarnoid outcrops	[Opal, Opal-AN var: Hyalite] Stara et al. (1993)
Idda Mountain ⓘ San Priamo Quarries	[Opal] Stara P. (1990)
ⓘ Sant'Antioco	[Opal, Opal-AN] Chinellato Matteo and Michael C. Roarke ...
Sicily Agrigento Province ⓘ Licata	[Amber] Jervis (1881) +1 other reference
Caltanissetta Province Milena ⓘ Giona Mine	[Opal] Friedel (1890) +1 other reference
Enna Province ⓘ Enna	[Amber] Jervis (1881)
ⓘ Pergusa Lake area	[Amber] Jervis (1881)
ⓘ Leonforte	[Amber] Ferrara F. (1805)
Metropolitan City of Catania Catania ⓘ Simeto River mouth	[Amber, Amber var: Simetite] - (See "simetite" references)
Santa Maria di Licodia ⓘ Santa Maria di Licodia	[Opal, Opal-AN] Sergio Russo Collection
Metropolitan City of Messina Eolie Islands (Aeolian Islands) Lipari ⓘ Lipari Island	[Opal] Russo (2006)
Pianoconte ⓘ Faurdo Valley (Fossa del Faurdo)	[Opal] Russo (2006)
Quattropani ⓘ Kaolin Mine	[Opal] Russo (2006) +1 other reference
Vulcano Island ⓘ La Fossa crater	[Opal] PANICHI U. (1924)
Porto Levante Faraglioni di Levante ⓘ Faraglione Nico	[Opal] PANICHI U. (1913)
ⓘ Grotta dell'Allume	[Opal] P.Forti (1994)
ⓘ Fumarole al Piano (Levante Beach fumaroles)	[Opal] Honnorez et al. (1971) +1 other reference
ⓘ Vulcanello	[Opal] PANICHI U. (1924)
Messina ⓘ Lake Faro	[Opal, Opal-AN] Somma et al. (2024)
Metropolitan City of Palermo ⓘ Petralia Soprana	[Amber] Bombicci (1890)
Ragusa Province ⓘ Pozzallo	[Amber] Giardina G. (1998)
Syracuse Province Augusta ⓘ Agnone Bay	[Amber, Amber var: Simetite] Scaccianoce (2018)
Pachino ⓘ Costa dell'Ambra	[Amber, Amber var: Simetite] Scaccianoce (2018)
Trapani Province ⓘ Pantelleria Island	[Opal] Jervis (1881) +1 other reference
Trentino-Alto Adige/Südtirol South Tyrol Puster Valley District Badia (Abtei) San Leonardo (San Linêrt; Sankt Leonhard) ⓘ Santa Croce (La Crusc; Heilig Kreuz)	[Amber] Koken E. (1913) +2 other references
Überetsch-Unterland (Oltradige-Bassa Atesina) Aldein (Aldino) Radein (Redagno) ⓘ Bletterbach Gorge	[Amber] Maffi et al. (1992) +1 other reference
Trento Province Ala Pilcante ⓘ Val di Serra Quarry	[Opal] Bortolozzi (n.d.)
Baselga di Pinè "Le Trote" ("La Trota") ⓘ Erla Mine	[Opal] Ferretti et al. (2018)
Canal San Bovo Vanoi Valley Pralongo ⓘ Pralongo granite quarry (Pralongo Quarry; Grisotto Quarry)	[Opal] Ferretti et al. (2015)
Castello Tesino ⓘ Cima D'Asta-Campo Regana	[Opal] Ferretti et al. (2008)
Pergine Valsugana ⓘ Viarago Mine	[Opal] Bortolozzi (n.d.)
Riva del Garda ⓘ Monte Brione	[Amber] Stoppani A. (1886) +1 other reference
Roncegno Terme ⓘ Cinquevalli Mine	[Opal] Exel (1987)
Trento ⓘ Doss Trento	[Amber] Ragazzi E. et al. (2012) +1 other reference
Tuscany Grosseto Province Castel del Piano ⓘ Mazzarelle quarry	[Opal] Fei (1997)
Monterotondo Marittimo ⓘ Mount Leo	[Opal] A.Costantini (2015)
ⓘ Santa Fiora	[Opal]
Livorno Province Campiglia Marittima ⓘ Botro ai Marmi	[Opal] Biagioni et al. (2013)
ⓘ Maffei Mine	[Opal] Nannoni et al. (2008)
Campo nell'Elba ⓘ San Piero in Campo	[Opal, Opal-AN] Orlandi et al. (1997)
ⓘ La Speranza (Pisani's Quarry)	[Opal, Opal-AN] Barsotti et al. (2006)
ⓘ Rosina vein (Rosina pegmatite)	[Opal, Opal-AN] Orlandi et al. (1997)
Sant'Ilario in Campo ⓘ Catri	[Opal] Giuliano bettini collection
Capoliveri Cape Calamita Mine ⓘ Macei stope	[Opal] G. Cocco et al. (Elba)
ⓘ Punta Rossa stope	[Opal]
Collesalvetti Colognole ⓘ Poggio alle Fate	[Opal] Bonifazi (2020)
ⓘ Montemassi	[Opal] Sammartino (2013-2014)
ⓘ Petrified wood occurrence	[Amber, Opal] Sammartino (2015-2016)
Livorno ⓘ Antignano	[Opal, Opal-AN var: Hyalite] Bonifazi (2020)
ⓘ Petrified wood occurrence	[Amber, Opal] Sammartino (2015-2016)
ⓘ Poggio Corbolone	[Opal] Bonifazi (2020)
Valle Benedetta ⓘ Via della Sambuca U-V occurrence	[Opal] LIBVRNA N°2 September 2021
Rio Rio Marina ⓘ Cape Arco Mine	[Opal] E. Manasse (Isola d'Elba)
ⓘ Torre di Rio - Santa Filomena area (Monte della Torre)	[Opal] Barsotti et al. (2006)
ⓘ Rosignano Marittimo	[Opal] Ref. Sammartino F.
ⓘ Botro dell'Arancio Quarry	[Opal, Opal-AN var: Hyalite] Bonifazi (2020)
ⓘ Botro Masaccio quarry	[Opal] Sartori F. (1967)
ⓘ Castiglioncello	[Opal, Opal var: Common Opal] Bonifazi (2020)
ⓘ Castiglioncello Mine	[Opal, Opal var: Opal-CT] Rielli et al. (2022)
ⓘ Fortullino	[Opal] Lenzi (1996) +1 other reference
ⓘ Gabbro	[Opal, Opal-AN var: Hyalite] Bonifazi (2020)
ⓘ Buca Fonda quarry	[Opal] parcoculturaledicamaiano.toscana.it (2016)
ⓘ Quartz occurrences	[Opal] parcoculturaledicamaiano.toscana.it (2016)
ⓘ Upper Ugione stream valley	[Opal] Sammartino (2014)
Lucca Province Fabbriche di Vergemoli Fornovolasco ⓘ Fornaccia	[Opal] • Biagioni et al. (2008)
Garfagnana Villa Collemandina ⓘ Sasso Cinturino	[Opal] Barsanti M.
Massa-Carrara Province Carrara Miseglia quarrying basin (Miseglia-Fantiscritti quarrying basin; Fantiscritti quarrying basin) Fantiscritti ⓘ Lucchetti Quarry (Strinato B Quarry; Strinato Quarry)	[Opal] Bonaccorsi et al. (2007)
Metropolitan City of Florence Gambassi Terme ⓘ Gambassi Quarry (Borgo alla Collina)	[Opal] Betti et al. (2017)
Il Castagno ⓘ La Striscia	[Opal] Betti et al. (2017)
ⓘ Impruneta	[Opal] Brizzi G. et al. (FI)
ⓘ Carraie Hill	[Opal] Brizzi G. (1996)
Montaione ⓘ Fornaci di Montignoso Quarry (Bi.Bru Quarry)	[Opal] Betti et al. (2017)
ⓘ Iano (Jano)	[Opal] Betti et al. (2017)
Pisa Province Montecatini Val di Cecina ⓘ La Sassa	[Opal] Ricci et al. (2021)
Monteverdi Marittimo Canneto ⓘ Poggio Castiglione	[Opal] Nannoni
Pomarance ⓘ Monterufoli	[Opal] Brizzi G. (1988)
Volterra ⓘ Poggio del Cornocchio quarries	[Opal] Orlandi (2005)
ⓘ Sensano	[Opal] Orlandi (2005)
Prato Province Prato ⓘ Monteferrato quarries	[Opal] Brizzi G. et al. (1996)
Siena Province Chiusdino ⓘ Le Cetine di Cotorniano mine	[Opal] Menchetti et al. (2015)
Murlo Pompana ⓘ Fosso della Chiesa Mine	[Opal] R. Meli (1999)
Tyrrhenian Sea Southern Tyrrhenian Sea Aeolian Arc seamounts ⓘ Palinuro Seamount	[Opal] Hollis et al. (2021)
Umbria Perugia Province Spoleto ⓘ Colle Fabbri	[Opal] Stoppa et al. (2010)
Terni Province San Venanzo ⓘ Vispi Quarry	[Opal] Bortolozzi (n.d.)
Veneto Belluno Province Belluno Borgo Prà ⓘ Ardo Stream	[Amber] Trevisani E. et al. (2011) +2 other references
Cortina d'Ampezzo ⓘ Ra Stua	[Amber] Roghi et al. (2004) +1 other reference
ⓘ Rifugio Dibona	[Amber] Gianolla et al. (1998) +3 other references
ⓘ Rumerlo	[Amber] von Koken (1913) +2 other references
Feltre ⓘ Pont	[Amber] Ragazzi E. et al. (2012) +1 other reference
ⓘ Sedico	[Amber] Ragazzi E. (2003) +1 other reference
Padova Province Cinto Euganeo Faedo Monte Fasolo ⓘ Case Berton Quarry	[Opal] Bortolozzi (n.d.)
Galzignano Terme ⓘ Monte delle Basse	[Opal] Bortolozzi (n.d.) +1 other reference
Torreglia ⓘ Perlite Quarry	[Opal] Fabris et al. (2014)
Vo' ⓘ Zovon	[Opal] Fabris et al. (2014)
Verona Province Grezzana ⓘ Bellori	[Amber] Neri et al. (2013) +1 other reference
Soave Fittà ⓘ Mount Foscarinetto	[Opal] Paolo Gasparetto Collection
Vestenanova Bolca ⓘ Pesciara (Pesciara di Bolca; Monte Postale)	[Amber] Trevisani et al. (2005) +1 other reference
Vicenza Province Cornedo Vicentino Spagnago ⓘ Grolla quarry	[Opal] Boscardin et al. (1990)
Laghi ⓘ Contrada Lorenzi	[Opal] Boscardin et al. (2011)
Monte di Malo ⓘ Rossi Quarry	[Amber] Boscardin et al. (1996) +2 other references
Montecchio Maggiore San Pietro ⓘ Monte Nero	[Opal] Bortolozzi (n.d.)
Salcedo ⓘ Chiavon Stream	[Amber] Ragazzi E. (2003) +1 other reference
Tonezza del Cimone ⓘ Valle della Neve quarry	[Opal] Bortolozzi (n.d.)

Ivory Coast
Montagnes Tonkpi Zouan-Hounien Department ⓘ Ity mine	[Opal, Opal-AN] Coulibaly et al. (2025)

Japan
Akita Prefecture Yuzawa City Ogachi ⓘ Akinomiya Hot Springs	[Opal, Opal var: Opal-CT] T. Nakanishi et al. (2003)
Aomori Prefecture Goshogawara City ⓘ Bonju mine	[Opal] - (n.d.)
Mutsu City Osorezan Volcano ⓘ Lake Usoriyama	[Opal, Opal var: Opal-A, Opal var: Opal-CT] Hayashi (2013)
Chiba Prefecture ⓘ Chōshi City	[Amber] Sadanaga et al. (1974) +1 other reference
Minamiboso city ⓘ Arakawa	[Opal] H. Imai collection. +1 other reference
Ehime Prefecture Ochi District Iwagi Island ⓘ Mount Kuresaka	[Opal] Imaoka et al. (2021) +1 other reference
Fukuoka Prefecture Tagawa District Kawara ⓘ Sannotake mine	[Opal, Opal-AN] Uehara et al. (2014)
Fukushima Prefecture Date City ⓘ Minowa	[Opal] Chishitsu Chousajo (1902)
ⓘ Hosaka	[Opal] Masutomi Museum specimen (Kyoto)
Ishikawa District ⓘ Ishikawa town (Ishikawa-machi)	[Opal] Chishitsu Chousajo (1902)
Gifu Prefecture Mizunami City ⓘ Tsukiyoshida	[Opal] specimens in several Japanese museums ...
Nakatsugawa City ⓘ Hirukawa	[Opal, Opal-AN] Petrov (n.d.)
ⓘ Tawara (Tahara)	[Opal, Opal-AN, Opal-AN var: Hyalite] Alfredo Petrov
Gunma Prefecture Agatsuma District Kusatsu ⓘ Okumanza Hot Spring	[Opal] Mineralogical Journal Vol. 20 (1998)
Hiroshima Prefecture Hiroshima City ⓘ Setagawa	[Opal, Opal-AN] Petrov (n.d.)
Hokkaidō Prefecture Iburi Subprefecture Usu District Sobetsu ⓘ Horobetsu sulphur mine	[Opal] Takeo Kato et al. (1934)
Kushiro Subprefecture Kawakami District Atosanupuri volcano (Iou-zan; Mount Iwo) ⓘ Atosanupuri sulphur mine	[Opal] Katsui (1962)
Okhotsk Subprefecture Kitami City ⓘ Kokuriki mine ?	[Opal] Katsu Kaneko (1956)
Sorachi Subprefecture Mikasa City Ponbetsu ⓘ Sunago coal mine	[Amber] Petrov (n.d.)
Tokachi Subprefecture Ashoro District Ashoro ⓘ Akan mine	[Opal] Suzuki (1957)
Kato District Shikaoi (Shikaoi-Chō) ⓘ Shikaribetsu Lake	[Opal] Amir Akhavan Collection
Hyogo Prefecture Akō City ⓘ Sakoshi-Odomari Au-Ag deposit	[Opal, Opal-AN var: Hyalite] Alfredo Petrov field trip observations
Kobe city Kita-ku ⓘ Yamada-cho	[Amber] Ou'e Rikosya specimens
Ibaraki Prefecture Kitaibaraki City ⓘ Hanakawa	[Amber] Sadanaga et al. (1974)
Makabe District Makabe-machi ⓘ Yamanoo	[Opal, Opal-AN] Alfredo Petrov specimens
Ishikawa Prefecture Komatsu City ⓘ Akase-machi	[Opal] Sadanaga et al. (1974)
ⓘ Nata-mura	[Opal] Chishitsu Chousajo (1902)
ⓘ Yusenji Mine	[Opal] - (n.d.) +1 other reference
ⓘ Suzu City	[Opal] Hiroaki Tano specimens.
ⓘ Menilite occurrence	[Opal] Hiroaki Tano's specimen
Iwate Prefecture Hachimantai City ⓘ Matsuo mine	[Opal] Takeo Kato et al. (1934) +1 other reference
ⓘ Kuji City	[Amber] Kuji Amber Museum +2 other references
ⓘ Goishi	[Amber] Kuji Amber Museum +2 other references
Kunohe-gun Noda ⓘ Noda-Tamagawa mine	[Opal] Watanabe (1959)
Kagoshima Prefecture Hishikari gold mine ⓘ Main deposit	[Opal] Fulin Zhang et al. (1986)
Kagoshima District Mishima village ⓘ Satsuma-Ioujima (Satsuma-Iwojima; Iou island)	[Opal] S. Hamasaki (2002)
ⓘ Higashi Onsen	[Opal] Amir Akhavan Collection
ⓘ Inamuradake	[Opal, Opal-AN var: Hyalite] Amir Akhavan Collection
ⓘ Iodake (Iwodake; Ioudake)	[Opal] S. Hamasaki (2002)
ⓘ Eastern alluvial fan	[Opal] Alfredo Petrov field collected ...
ⓘ Main Crater	[Opal]
ⓘ Monogusa	[Opal, Opal-A var: Opal-AG] Amir Akhavan Collection
ⓘ North-western fumarole field	[Opal]
Kirishima City Makizono ⓘ Sandaidou	[Opal] Petrov (n.d.)
Kochi Prefecture Kochi City ⓘ Kunimiyama mine	[Opal] Kaneko (1956)
Kyoto Prefecture Yosa District Yosa-mura ⓘ Oeyama mine	[Opal] IMAI et al. (2000)
Mie Prefecture Ise City ⓘ Tsujikuru	[Opal] Kimura et al. (1982)
Miyagi Prefecture Katta District Zao ⓘ Enda	[Opal] - (n.d.)
ⓘ Onikobe geothermal field	[Opal] Seki et al. (1968)
Nagano Prefecture Chino City ⓘ Suwa mine	[Opal] H. Minato (1953)
Nagasaki Prefecture Higashisonogi District ⓘ Sonogi mine	[Opal] - (n.d.)
Nara Prefecture Uda City ⓘ Yamato Mine (Yamato-suigin Mine)	[Opal] Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960)
Niigata Prefecture Osudo ⓘ Murakami sericite deposit	[Opal] 29:179-186 +1 other reference
Okayama Prefecture ⓘ Kenzan mine	[Opal, Opal-AN var: Hyalite] Yamada (2004)
Maniwa City Teragohchi ⓘ Ohnagusa mine (Onagusa)	[Opal] H. Momoi (1964)
Saga Prefecture Karatsu City Hizen-cho ⓘ Mitsukoshi	[Opal, Opal-AN] Miyawaki et al. (2003)
ⓘ Niikoba	[Opal, Opal-AN] Miyawaki et al. (2000)
Kyuuragi-machi ⓘ Kyuuragi mine (Kyuragi mine) ?	[Opal] Katsu Kaneko (1956)
Shiga Prefecture Kusatsu City ⓘ Ioi mine	[Opal] Hiroaki Tano's collection
Otsu City ⓘ Tanakami-yama (Tanokami-yama)	[Opal, Opal-AN] Nakatsugawa Mineral Museum (Gifu Prefecture, Japan)
Shizuoka Prefecture Shimoda City Rendaiji ⓘ Kawazu mine (Rendaiji mine; Rendaizi mine)	[Opal] - (unpublished species lists maintained by local collectors) +1 other reference
Tochigi Prefecture Nikko City Ashio ⓘ Ashio mine (Ashio copper mine)	[Opal, Opal-AN] Patchick (1959)
Tokyo Metropolis Hachijō Subprefecture ⓘ Aogashima Island	[Opal] Alfredo Petrov - field observations
ⓘ Hachijō-jima Island	[Opal, Opal-AN] field collected by Alfredo Petrov
Hachioji City ⓘ Asagawa	[Amber] Petrov (n.d.)
Ogasawara Subprefecture Ogasawara Islands Chichijima Group Chichi Island (Chichijima) ⓘ Kita-hatsuneura (2)	[Opal] Mineralogical Journal Vol. 11 (1982)
ⓘ Susaki	[Opal] Mineralogical Journal Vol. 11 (1982)
Volcano Islands Iwo Jima (Iou-to; Iou Island; Iwojima; Iou-jima; Naka-Iou-jima) ⓘ Suribachiyama	[Opal] Gordon A. MacDonald (1948)
Toyama Prefecture Kaminiikawa district ⓘ Tateyama hot springs	[Opal] Chishitsu Chousajo (1902)
Yamagata Prefecture Tsuruoka City ⓘ Irakawa (Isogawa)	[Opal] Mizota (1969)
Yamaguchi Prefecture Mine city ⓘ Ofuku mine (Yamato mine)	[Opal] - (n.d.)
Yamanashi Prefecture ⓘ Kinpuzan mining district	[Opal] Chishitsu Chousajo (1902)

Jordan
Amman Governorate Transjordan Plateau Daba-Siwaqa complex ⓘ Daba	[Opal, Opal var: Opal-CT] Pitty et al. (2010)
Hashem region Lisdan-Siwaga Fault Siwaga Tulul al Hammam ⓘ Unnamed marble quarries	[Opal] Sokol +9 other references
Irbid Governorate Maqarin area ⓘ Yarmouk river	[Opal, Opal var: Opal-CT] Khoury et al. (1985)
Jerash Governorate Jerash ⓘ Jerash lignite occurrence	[Amber] Dill et al. (2009)
Madaba Governorate ⓘ Wadi Zerka	[Amber] Poinar (1992)

Kazakhstan
Abai Region Tarbagatai Range Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts) ⓘ Verkhnee Espe Massif (Verkhnee Espe deposit)	[Opal] Bailey (1980)
Aktobe Region Kargaly District Kempirsai Cr deposit Batamshinsk ore field ⓘ Bugor Opal Outcrop	[Opal, Opal var: Moss Opal] Абдуллин et al. (2013)
ⓘ Promezhutochnoe Opal locality	[Opal, Opal var: Moss Opal] Абдуллин et al. (2013)
ⓘ Kempirsay massif	[Opal] Korobkin et al. (2022)
Khromtau District ⓘ Kempyrsay	[Opal] Bespaev et al. (n.d.)
Martuk District ⓘ Voznesenovka	[Opal, Opal var: Fire Opal] Oleg Lopatkin collection
Mugalzhar District ⓘ Kokmola	[Opal] Bespaev et al. (n.d.)
Jambyl Region Moiynkum District ⓘ Kara-Oba W deposit	[Opal] Ermilova et al. (1961) +1 other reference
Karaganda Region Aktogay District ⓘ Batystau polymetallic deposit	[Opal] Pekov (1998)
Karkaraly ⓘ Ken'-Choku deposit (Ken'-Cheku; Ken'-Shoko)	[Opal] Pavel M. Kartashov (n.d.)
Shet District ⓘ Ken-Choku (Kenshoky) deposit	[Opal] According reports of geological service ...
Pavlodar Region May District ⓘ May agate occurrence (Mayskoye agate occurrence)	[Opal] Bespaev et al. (2001)
ⓘ Shymkent City	[Amber] Soriano (2009)
Turkistan Region Sozak District ⓘ Shovan deposit	[Opal] Ваулин (2016)
Ulytau Region Ulytau District Chu-Ili Mountains ⓘ Kyzylsai Mo-U deposit	[Opal] Pekov (1998)
Mayatas ore region ⓘ Maike Occurrence	[Opal] Levin et al. (2021)
Zhanaarka District ⓘ Pstan	[Opal, Opal var: Cacholong, Opal var: Moss Opal] Gems of Kazakhstan et al. (in Rus.)

Kenya
Baringo County ⓘ Lake Bogoria (Hannington Lake)	[Opal, Opal var: Opaline] Owen et al. (2008)
Kajiado County Mount Suswa (Suswa Volcano) ⓘ Cave No. 13A	[Opal] Forti et al. (2004)
Makueni County Chyulu Hills ⓘ Leviathan Cave	[Opal] Forti et al. (2003)
Taita-Taveta County Voi Tsavo National Park ⓘ Shetani Lava Cave	[Opal] Forti et al. (2003)

Kosovo
Ferizaj District Shtime Glavika ⓘ Glavika Laterite Mine	[Opal] Mineral deposits and mining districts ... +2 other references
ⓘ Pristina District	[Opal, Opal var: Chrysopal, Opal var: Prase Opal] Vanrusselt (2023)
Drenas (Glogovac) Çikatovë e Vjetër (Cikatovo) ⓘ Cikatovo Laterite Mine	[Opal] Mineral deposits and mining districts ...
Lipjan ⓘ Gllavice Mine	[Opal, Opal var: Chrysopal, Opal var: Hydrophane] Cunico Resources

Latvia	[Amber]

Kurzeme Region ⓘ South Kurzeme Municipality	[Amber] Dreimanis A.
ⓘ Ventspils Municipality	[Amber] Dmitry Vorobjov's collection
Vidzeme Region Ādaži Municipality ⓘ Carnikava Parish	[Amber] Dmitry Vorobjov's collection
ⓘ Carnikava Beach	[Amber] Dmitry Vorobjov's collection

Lebanon
South Governorate ⓘ Jezzine District	[Amber] Poinar (1992)
ⓘ Dar al-Baidha (Dar el Beida)	[Amber] Poinar (1992)

Libya
Tripoli District ⓘ Tripoli	[Opal] Robert D. Crangle (2008)

Lithuania
ⓘ Curonian Lagoon	[Amber] GEOCHRONOMETRIA 33 (2009)
Klaipėda County Klaipeda District Municipality Klaipeda ⓘ Curonian Spit	[Amber] Dmitry Vorobjov's collection
Neringa Municipality Neringa ⓘ Juodkrantė	[Amber] GEOCHRONOMETRIA 33 (2009)
Telšiai County Varniai ⓘ Lake Lukstas	[Amber] Ellen Chivers Davies (1937)

Madagascar
Alaotra-Mangoro Ambatondrazaka District Ambatosoratra Commune ⓘ Ambatosoratra pegmatite	[Opal] Behier (1963)
Amoron'i Mania Ambatofinandrahana District Mandrosonoro Ambatovita ⓘ Sakavalana mine	[Opal] - (n.d.)
Mangataboahangy ⓘ Antsakoanimanta (Mangatobangy)	[Opal] Pezotta (1996)
ⓘ Volonandrongo (Volonondrongo)	[Opal] Behier (1963)
Ambositra District Sahatsiho Ambohimanjaka Manandona Valley ⓘ Antandrokomby pegmatite	[Opal] Ranorosoa (1986)
Manandriana District Andakatany Ambatofangehana ⓘ Pachoud Mine	[Opal] Lacroix (1899)
Androy Ambovombe-Androy Ampamata ⓘ Mandrovato phlogopite mine	[Opal] Behier (1963)
Tsihombe District Tsihombe Commune ⓘ Anjanikaima phlogopite deposit	[Opal] Besaire (1966)
ⓘ Sakamasy phlogopite mine	[Opal] Behier (1963)
Anosy Amboasary Sud District Behara ⓘ Vohibola phlogopite deposit	[Opal] Michel Arliguie photo and specimen
ⓘ Tsivory	[Opal] Eliana Intruglio's mineral collection
Betroka District Beampombo II ⓘ Beapompo II workings	[Opal, Opal var: Opal-CT] Popov et al. (2020)
Benato Toby ⓘ Benato phlogopite mines	[Opal] Behier (1963)
Mahasoa Est ⓘ Itrongay (Itrongahy)	[Opal] Lacroix (1922)
Atsimo-Andrefana Betioky District Lazarivo ⓘ Vohitsevo	[Opal] Behier (1963)
Atsimo-Atsinanana Befotaka District Marovitsika Sud Bemia ⓘ Fire Opal Occurrence	[Opal, Opal var: Fire Opal, Opal var: Opal-C, Opal var: Opal-CT] Simoni et al. (2010)
Vakinankaratra Antsirabe I District ⓘ Mangarivotra	[Opal, Opal-AN] Knut Edvard Larsen collection # M-190
Antsirabe II District Ibity Sahatany Valley ⓘ Manjaka (Sahananana)	[Opal, Opal-AN] Knut Edvard Larsen collection
ⓘ Vohidahy	[Opal] Ranorosoa (1986)
Vinaninkarena Anjanamanjaka ⓘ Vatovory (Vinaninkarena Uranium deposit)	[Opal] Behier (1963)
ⓘ Faratsiho	[Opal] Behier (1963)
Faratsiho Commune ⓘ Unnamed Opal locality	[Opal] Behier (1963)

Malaysia
Sarawak Kapit Division ⓘ Merit Block coal deposits	[Amber] Schlee (1992) +1 other reference
Kuching Division Bau ⓘ Gading deposit	[Opal] Yajima (1960)
Miri Division ⓘ Niah Great Cave (Gunong Jerneb)	[Opal] Bridge et al. (1983)

Mali
Kayes Region Nioro du Sahel Cercle ⓘ Opal occurrence	[Opal]

Marshall Islands
ⓘ Wōdejebato Guyot	[Opal] Rex (1967)

Mauritania
Tiris Zemmour Region Bir Lemjed ⓘ MGS No. BL6844	[Opal] Marsh et al. (2015)

Mexico	[Opal, Opal var: Fire Opal]

Baja California San Felipe Municipality El Marmol Delicias ⓘ San Carlos Mine (Verónica claim; El Apache; San Felipe)	[Opal] Wilson W.E. (2024)
Tijuana Municipality Tijuana ⓘ Rodriguez Dam	[Opal, Opal var: Fire Opal] Lavinsky (n.d.)
Baja California Sur Loreto Municipality ⓘ Santa Rosa	[Opal] RODRIGUEZ-DIAZ
Mulegé Municipality ⓘ Bahía Concepcio´n	[Opal, Opal var: Opaline] Canet et al. (2005) +1 other reference
Chiapas San Cristobal de Las Casas Municipality San Cristobal de Las Casas ⓘ Teopisca	[Amber] Bryant (1983)
ⓘ Simojovel Municipality	[Amber] www.gemologyonline.com (n.d.)
Totolapa Municipality ⓘ Totolapa	[Amber] Bryant (1983)
ⓘ Chihuahua	[Opal] Mason (1976)
Aldama Municipality ⓘ Estacion Trancas	[Opal] Megaw (2023)
ⓘ Las Choyas	[Opal] Cross (2006)
Peña Blanca District ⓘ Sierra Peña Blanca	[Opal] Hernández-Herrera et al. (2025)
ⓘ Margaritas No. 1 Mine	[Opal] George-Aniel et al. (1991) +1 other reference
ⓘ Nopal No. 1 Mine	[Opal] Econ Geol (1991) +4 other references
Aquiles Serdán Municipality Santa Eulalia Mining District West Camp Francisco Portillo ⓘ Animas Mine	[Opal, Opal-AN] Eric Quinter collection
Chínipas Municipality Palmarejo ⓘ Guadalupe deposit	[Opal, Opal var: Opaline] Sotelo (2016)
Manuel Benavides Municipality San Carlos ⓘ Apex mine	[Opal] Hewitt
ⓘ Tres Marias mine	[Opal] Saini-Eidukat et al. (2009)
Saucillo Municipality Naica ⓘ Naica Mine	[Opal] Gazquez et al. (1)
Coahuila Cuatro Ciénegas Municipality Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza) Limestone caves ⓘ Rancho Guadalupe cave	[Opal, Opal var: Opal-CT] Forti (2006)
Sierra Mojada Municipality Sierra Mojada ⓘ Fortuna Mine	[Opal, Opal-AN] Panczner (1987)
Durango Coneto de Comonfort Municipality América-Sapioris District (Potrillos) Sierra de San Francisco ⓘ Artroyos Mine	[Opal, Opal-AN] Yves Masson photo
Coneto de Comonfort ⓘ Barranca Mine	[Opal]
Durango Municipality Cerro de los Remedios Victoria de Durango ⓘ Cerro de Mercado Mine	[Opal, Opal-AN]
Mapimí Municipality ⓘ Mapimí	[Opal, Opal var: Opal-CT] Hyrśl (2012)
Mezquital Municipality Mezquital ⓘ San Francisco del Oro Mine	[Opal] Panczner (1987)
Pánuco de Coronado Municipality Francisco I. Madero ⓘ La Esperanza Mine	[Opal] [AmMin 85:263]
Guanajuato Cuerámaro Municipality Cuerámaro ⓘ Buenos Aires Mine	[Opal, Opal var: Cherry Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Guanajuato Municipality	[Opal, Opal-AN, Opal-AN var: Hyalite] Alessandro Cantamessa collection
Pénjamo Municipality Pénjamo ⓘ Buenos Aires Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
San Felipe Municipality ⓘ San Felipe	[Opal, Opal-AN, Opal-AN var: Hyalite] Alessandro Cantamessa collection
Santa Catarina Municipality Santa Catarina Cerro de las Fajas ⓘ Santín Mine	[Opal] Am Min (1955) +1 other reference
ⓘ Hidalgo	[Opal, Opal var: Fire Opal] Mason (1976)
Zimapán Municipality ⓘ Zimapán	[Opal, Opal var: Fire Opal]
ⓘ Lomo del Toro Mine	[Opal] Panczner (1987)
ⓘ Jalisco	[Opal] Mason (1976)
Magdalena Municipality La Amazata ⓘ Amazata Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Estancia Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Magdalena	[Opal, Opal var: Fire Opal]
ⓘ Tepucanapa Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Unica Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
San Andrés ⓘ Mara Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
San Simón ⓘ Chela Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ San Simón Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
San Cristóbal de la Barranca El Salvador ⓘ Cobano Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Hornitos Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
Mexico Temascaltepec Municipality Temascaltepec de González (Temascaltepec) ⓘ La Guitarra mine (La Guitarra deposit)	[Opal] Camprubi
Michoacan Uruapan Municipality ⓘ Paricutin volcano	[Opal, Opal var: Opal-CT] Fritsch et al. (2004)
Nayarit La Yesca Municipality La Yesca ⓘ Buena Vista Mine	[Opal] Panczner (1987)
Xalisco Municipality La Curva ⓘ Divisadero Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Popocatépetl Volcano	[Opal, Opal var: Opal-CT] Curtis +3 other references
Puebla Ixtacamaxtitlán Municipality Ixtacamaxtitlán ⓘ Ixtacamaxtitlán kaolinite deposit	[Opal] Tritlla et al. (2004)
ⓘ Tuligtic Cu deposit	[Opal] Tritlla J. et al. (Puebla state, Mexico)
ⓘ Queretaro	[Opal, Opal var: Cherry Opal, Opal var: Mexican Fire Opal] Mason (1976)
Amealco Municipality Amealco ⓘ La Purísima Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ Colón (Columbus) Municipality	[Opal, Opal var: Mexican Fire Opal]
Ezequiel Montes Municipality Ezequiel Montés ⓘ Guadalupana Mine	[Opal, Opal var: Precious Opal] Panczner (1987)
ⓘ San Juan del Río Municipality	[Opal, Fire Opal var: Precious Fire Opal, Opal var: Fire Opal, Precious Opal var: Contra Luz Opal]
Tequisquiapan Municipality La Trinidad ⓘ Carbonera Mine	[Opal, Opal var: Fire Opal, Opal var: Precious Opal] Gübelin (1985)
ⓘ San Luis Potosí	[Opal, Opal-AN]
Mexquitic de Carmona Municipality ⓘ Fluor-buergerite occurrence	[Opal, Opal-AN, Opal var: Common Opal] Cook (2013)
Villa de Arriaga Municipality ⓘ Tepetate	[Opal, Opal-AN] various added photos
Villa de Reyes Municipality ⓘ La Ventilla	[Opal, Opal-AN var: Hyalite] Panczner (1987)
Sonora Moctezuma Municipality Moctezuma ⓘ Candelaria Mine	[Opal] Carles Curto specimen
Veracruz Tamalín Municipality ⓘ Tamiahua Lagoon	[Opal] Porras-Toribio et al. (2022)
Zacatecas ⓘ Villa García Municipality	[Opal, Opal-AN] King (n.d.)
El Copetillo ⓘ Mina Veronica	[Opal, Opal-AN] Luetcke (n.d.)

Middle East
ⓘ Hatrurim Formation	[Opal] Gross (1977)

Moldova
Administrative-Territorial Units from the Left Bank of the Dniester ⓘ Ghidirim diatomite	[Opal] Vasile et al. (2007)

Mongolia
Dornogovi Province ⓘ Ulugei	[Opal] Pavel M. Kartashov (n.d.)
Ömnögovi Province Khanbogd District ⓘ Khan Bogd Peralkaline Granite	[Opal] Kynicky et al. (2011)

Morocco
Drâa-Tafilalet Region Ouarzazate Province Amerzgane Cercle Amerzgane Caïdat Imini area ⓘ Asif Amergou	[Opal] Jewel Tunnel specimens obtained by Rock ...
Tinghir Province Tinghir Cercle Imiter mining district ⓘ Igoudrane mine	[Opal, Opal-AN] Samira et al. (2015)
Zagora Province Agdz Cercle Tansifte Caïdat Aït Ahmane ⓘ Vein No. 54	[Opal] Favreau (n.d.) +1 other reference
ⓘ Vein No. 59	[Opal] Favreau et al. (2006)
ⓘ Tachgagalt Mine	[Opal] FAVREAU G. & DIETRICH J.E. (2006)
Marrakesh-Safi Region El Kelaâ des Sraghna Province ⓘ Sidi Rahal	[Opal] On quartz specimens field-collected by ...
Souss-Massa Region Taroudant Province Taliouine Cercle Ouzioua Caïdat ⓘ Imourkhssen Cu±Mo±Au±Ag Porphyry Deposit	[Opal, Opal-AN] Ferraq et al. (2024)

Myanmar	[Amber]

Kachin State Myitkyina District ⓘ Hukawng Valley	[Amber] Cruickshank et al. (2003) +2 other references
ⓘ Tanai Township (Tanaing Township)	[Amber, Amber var: Burmite] Mason (1976)
ⓘ Maingkwan	[Amber, Amber var: Burmite] Cruickshank et al. (2003)
Tanai ⓘ Amber diggings	[Amber, Amber var: Burmite] numerous well-labelled specimens on ...
Magway Region Gangaw District ⓘ Tilin	[Amber] Zheng et al. (2018) +1 other reference
ⓘ Sagaing Region	[Amber] Nyunt et al. (2021)
Hkamti District Hkamti Township (Khamti Township) ⓘ Kandi amber mining area	[Amber] Shi et al. (2023)
ⓘ Pat-tar Bum amber mining area	[Amber] Nyunt et al. (2020)
Katha District Tigyaing Township (Htigyaing Township) ⓘ Tagaung Taung Ni deposit	[Opal] Harald Schillhammer collection

Namibia
Erongo Region Arandis Constituency ⓘ Husab Mine	[Opal] Swakop Uranium
Dâures Constituency Eureka Farm 99 ⓘ Eureka carbonatite	[Opal] - (n.d.)
Spitzkoppe area ⓘ Klein Spitzkoppe	[Opal] Cairncross (2005)
ⓘ Tubussis Farm 22	[Opal, Opal-AN] Schnaitmann et al. (2007)
ⓘ Erongo Mountains	[Opal, Opal-AN] MinRec
Karibib Constituency ⓘ Lattice quartz occurrence ('Gitterquarz-Fundstelle')	[Opal, Opal-AN] E. Schnaitmann et al. (2008)
Usakos ⓘ Ameib Farm 60	[Opal]
Omaruru Constituency ⓘ Krantzberg Mine	[Opal] Jahn et al. (2006)
Hardap Region ⓘ Rehoboth Rural	[Opal, Opal-AN var: Hyalite] von Bezing (2007)
Khomas Region Windhoek Rural Aris ⓘ Aris Quarries	[Opal] Wartha et al. (2001) +1 other reference
Gamsberg area ⓘ Nauchas Farm 14	[Opal] von Bezing (2007)
Kunene Region ⓘ Khorixas	[Opal, Opal var: Opal-CT] Saphira Minerals specimens
ⓘ Mesopotamia copper valley	[Opal, Opal var: Opal-CT] Gerhard Louw photo ID 983450
ǁKaras Region Karasburg West ⓘ Gaidip Farm 146	[Opal, Opal-AN] von Bezing (2007)

Netherlands
Drenthe Borger-Odoorn ⓘ Hondsrug	[Amber] Krul (1969)
Friesland ⓘ Ameland	[Amber] Krul (1969)
ⓘ North Holland	[Amber] Gerard van der Veldt collection
Overijssel ⓘ Borne	[Amber] Krul (1969)
Hof van Twente ⓘ Delden	[Amber] Krul (1969)
ⓘ Losser	[Amber] Krul (1969)
Twenterand ⓘ Westerhaar-Vriezenveensewijk	[Amber] Krul (1969)
South Holland ⓘ Noordwijk	[Amber] Krul (1969)

New Zealand
Auckland Region Lake Pupuke ⓘ Smales Quarry	[Opal, Opal-AN] Rod Martin personal collection
Manukau Harbour ⓘ Cornwallis Peninsula	[Opal, Opal var: Opal-C] Rod Martin Collection
ⓘ Rangitoto Island	[Opal, Opal-AN] Collection of RJ Martin
Waitakere Ranges ⓘ Te Henga Road quarry	[Opal, Opal-AN] Tim Saunderson collection
ⓘ Whatipu	[Opal, Opal-AN] Rod Martin Collection
Bay of Plenty Region ⓘ Calypso Vent field	[Opal, Opal var: Opaline] Schwarz-Schampera et al. (2007) +1 other reference
Kawerau District ⓘ Kawerau Geothermal field	[Opal] Milicich +1 other reference
Mayor Island (Tuhua) ⓘ Omapu Bay (Western Bay)	[Opal] NZJGG
ⓘ Opo Bay (South East Bay)	[Opal, Opal var: Precious Opal] NZJGG +1 other reference
ⓘ Taratimi Bay (Crater Bay)	[Opal] Collection of RJ Martin
Rotorua District ⓘ Haparangi	[Opal] Rod Martin Collection
ⓘ Lake Rotorua Area	[Opal, Opal-AN var: Hyalite] Collection of RJ Martin
Mount Ngongotaha ⓘ Hendersons Quarry	[Opal, Opal-AN var: Hyalite] Tim Saunderson collection
Okataina ⓘ Mount Tarawera	[Opal, Opal-AN var: Hyalite] Collection of Rod Martin
ⓘ Te Kopia geothermal area	[Opal, Opal var: Opal-C] Martin et al. (1999)
ⓘ Waiotapu (Wai-O-Tapu)	[Opal] JONES et al. (2006)
ⓘ Frying Pan Lake	[Opal] Jones et al. (2005)
Canterbury Region Ashburton District ⓘ Gawler Downs	[Opal, Opal-AN] Collection of RJ Martin
Christchurch City Banks Peninsula Lyttelton ⓘ Gollans Bay Quarry	[Opal] Collection of RJ Martin
ⓘ Duntroon	[Opal, Opal-AN] Knut Edvard Larsen collection # MM- 3930 (collected by Dick Dufton)
ⓘ Maerewhenua	[Opal, Opal-AN] Judy Rowe collection
Selwyn District Coalgate ⓘ Harper Hills Volcanics	[Opal] Collection of RJ Martin
ⓘ Rakaia Gorge	[Opal, Opal-AN] Judy Rowe collection
Hawke's Bay Region Central Hawke's Bay District ⓘ Blackhead Beach	[Opal] Nyman
Manawatu-Whanganui Region Ruapehu District Ohakune ⓘ Public works quarry (Ohakune scoria pit)	[Opal, Opal-AN] Judy Rowe and Alfredo Petrov specimens
Marlborough Region Marlborough Sounds ⓘ D'Urville Island	[Opal, Opal-AN] Collection of RJ Martin
New Zealand Outlying Islands Kermadec Islands ⓘ Brothers Volcano	[Opal, Opal var: Opal-CT] de Ronde +17 other references
Northland Region Far North District Aupōuri Peninsula Awanui ⓘ Gumdiggers Park	[Amber] www.gumdiggerspark.co.nz (n.d.)
Kaipara District Hukatere Peninsula ⓘ Tinopai	[Opal, Opal var: Opal-CT, Opal-CT var: Lussatite] Sutherland et al. (ed.)
ⓘ Tokatoka	[Opal] Mason (1957)
Whangarei District ⓘ Puhipuhi	[Opal] Collection of RJ Martin
ⓘ Mount Mitchell prospect	[Opal, Opal var: Opaline] Hampton et al. (2004)
ⓘ Rising Sun prospect	[Opal] Gary Leske specimen
ⓘ Te Mata	[Opal] Aurora Minerals
Otago Region ⓘ Bridge Point	[Opal] Collection of RJ Martin
Central Otago District Idaburn ⓘ Idaburn Mine	[Amber] Seyfullah et al. (2015)
Roxburgh ⓘ Harliwich Mine (McPhersons)	[Amber] picssr.com (n.d.)
St. Bathans ⓘ Cambrians (Welshmans Gully; Four Mile)	[Amber] Dunstan Times newspaper (1875)
Dunedin City ⓘ Doctors Point	[Opal, Opal-AN] Judy Rowe collection
Otago Peninsula Portobello ⓘ Portobello Bay	[Opal] Collection of RJ Martin (initial ID by S Courtney, Univ of Auck)
ⓘ Taiaroa Head	[Opal] Collection of RJ Martin
ⓘ Moeraki Point	[Opal] Collection of RJ Martin (initial ID by S Courtney, Univ of Auck)
Oamaru ⓘ Old Mill Road Quarry (Dog Pound Quarry)	[Opal, Opal-AN] Old Mill or Dog Pound Quarry et al. (NZ)
Southland Region Gore District Waimumu ⓘ New Vale Mine (Goodwin Coal Mine)	[Amber] Ferguson et al. (2009)
Southland District ⓘ Round Hill	[Amber] Craw et al. (2015)
Taranaki Region Stratford District Egmont National Park ⓘ York Road Quarry	[Opal, Opal-AN var: Hyalite] Collection of RJ Martin
Tasman Region Takaka ⓘ Copperstain Creek	[Opal] Collection of RJ Martin
Waikato Region Hauraki District Karangahake ⓘ Rahu prospect	[Opal, Opal var: Opaline] Zuquim et al. (2012)
Paeroa ⓘ Maratoto Mine	[Opal, Opal-AN var: Hyalite] Tim Saunderson collection
Taupo District Atiamuri ⓘ Ongaroto Road	[Opal, Opal-AN var: Hyalite] Collection of Rod Martin
ⓘ Broadlands (Ohaaki)	[Opal] Milicich +1 other reference
ⓘ Lake Taupo	[Opal, Opal var: Opal-CT] Brathwaite et al. (2021)
ⓘ Rangatira Point (Ponui Point)	[Opal, Opal var: Common Opal] Collection of RJ Martin
Orakeikorako Thermal Area (Orakei Korako; The Hidden Valley) ⓘ Ruatapu Cave (Alum Cave)	[Opal, Opal var: Opal-A] Rod Martin et al. (NZ) +1 other reference
ⓘ Tongariro Alpine Crossing Northern Circuit	[Opal] Johnstone (1979)
Wairakei ⓘ Lake Rotokawa	[Opal, Opal-AN] Rod Martin personal collection
ⓘ Ngatamariki thermal area (Pavlova Spring)	[Opal, Opal-AN] Brotheridge et al. (1995)
ⓘ Wairakei geothermal area (Craters of the Moon)	[Opal] Tschernich (1992)
Thames-Coromandel District Coromandel peninsula ⓘ Kuaotunu	[Opal, Opal var: Common Opal] Rod Martin Collection
Hikuai ⓘ Broken Hills	[Opal, Opal var: Common Opal] Moore (1979)
ⓘ Broken Hills Mine	[Opal, Opal var: Opaline] Moore (1979)
ⓘ Puketui Road mordenite locality	[Opal, Opal-AN] Collection of RJ Martin
Tairua River ⓘ 4th Branch	[Opal, Opal-AN] Collection of RJ Martin
ⓘ Kauaeranga Valley	[Opal, Opal var: Common Opal] Collection of RJ Martin
ⓘ Tairua	[Opal] Swindale et al. (1968)
ⓘ Tairua opal mine	[Opal, Opal var: Common Opal, Opal var: Precious Opal] Collection of RJ Martin
Wellington Region South Wairarapa District Red Hill ⓘ Volcano Road Quarry	[Opal, Opal-AN var: Hyalite] CF Johnson collection +1 other reference

North Macedonia
Češinovo-Obleševo Municipality ⓘ Spanchevo	[Opal] opal +1 other reference
Lipkovo Municipality ⓘ Lojane	[Opal] Hiessleitner (1931)
Probistip Municipality Kratovo-Zletovo ore district ⓘ Plavica deposit (Plavica-Zlatica deposit; Plavitsa deposit)	[Opal] Serafimovski et al. (2015)
ⓘ Zletovska Reka Mine	[Opal] Radusinovic (1974)
Plesenci ⓘ Plesenci deposit	[Opal] Serafimovski et al. (2015)
Veles Municipality ⓘ Groot	[Opal] Spasovski et al. (2009)
ⓘ Groot Fe-Ni Deposit	[Opal] Spasovski et al. (2009)

Norway
Agder Evje og Hornnes Landsverk ⓘ Landsverk 1 Feldspar Quarry (Jokeli)	[Opal, Opal-AN var: Hyalite] Larsen (2024)
Iveland Frikstad ⓘ Frikstad 07 Feldspar Quarry	[Opal, Opal-AN] Revheim (2004)
Akershus Asker ⓘ Borgenåsen	[Opal]
ⓘ Heggedalsveien	[Opal] Stensrud (2004)
Hurum ⓘ Fuglemyr	[Opal, Opal-AN] Knut Edvard Larsen MM-collection (#1089)
ⓘ Vardåsen Tunnel	[Opal] Stensrud (2004)
Eidsvoll Minnesund ⓘ Byrud Emerald Mines	[Opal] Kvamsdal et al. (2006)
Lunner ⓘ Gjerdingselva	[Opal] Raade et al. (1982)
Øståsen ⓘ Midtmoen	[Opal] Kvamsdal (1993)
Nittedal ⓘ Bjønndalen Quarry	[Opal] Knut Eldjarn Collection
ⓘ Delebekken Quarry	[Opal] Kvamsdal (2018)
ⓘ Gjelleråsen	[Opal] Kvamsdal (1998)
Buskerud Drammen Åssiden ⓘ Batteriet	[Opal, Opal-AN] Hurum (2004)
ⓘ E 134 Road	[Opal, Opal-AN] Nordli et al. (1997) +1 other reference
ⓘ Myrseter area	[Opal] Berg (198?)
ⓘ Hans-Jørgens locality	[Opal] Knut Edvard Larsen collection and ...
Svelvik ⓘ Brentås	[Opal, Opal-AN] Larsen et al. (2004)
ⓘ Juve Quarry	[Opal, Opal-AN] Nordrum (2007)
Lier Lierskogen ⓘ Lierskogen Quarry	[Opal]
ⓘ Sauesetra	[Opal] Nordrum et al. (1999)
Nordland Hamarøy Finnøya ⓘ Håkonhals Quarry	[Opal] Husdal (2008)
Oslo Grorud Bånkall ⓘ Kristiansen Quarry (Bånkall Quarry)	[Opal] Kvamsdal (1998)
ⓘ Huken Quarry	[Opal] Kvamsdal (1999)
ⓘ Oslo Volcanic Province	[Opal] Raade (1972)
Telemark Drangedal Tørdal ⓘ Heftetjern pegmatite	[Opal] Raade et al. (2000)
Kragerø Valberg ⓘ Valberg Quarry	[Opal] Peter Andresen observation oct.2003
Porsgrunn Eidanger Bergsbygda ⓘ Gurpekollen	[Opal] Berge (n.d.)
Siktesøya ⓘ Brønnebukta	[Opal, Opal-AN] Berge (n.d.)
Skien ⓘ Flekkeren	[Opal] Jamtveit et al. (1997)
Trøndelag Oppdal ⓘ Åmotsdalen	[Opal, Opal-AN] Witsø (1995)
ⓘ Bjørnåa	[Opal, Opal-AN] www.strahlen.org (n.d.)
ⓘ Northwest of Snøhetta Mountain	[Opal, Opal-AN] Witsø (1995)
Trollheimen ⓘ Gjevilvassdalen	[Opal, Opal-AN] Witsø (1995) +1 other reference
Vestfold Holmestrand Fjordveien ⓘ Railway tunnel	[Opal, Opal-AN] Nordrum (2012)
ⓘ Kjeksrød	[Opal] Kvamsdal (1998)
ⓘ Løkenåsen	[Opal, Opal-AN] Nordrum et al. (1997) +1 other reference
Sande Selvik ⓘ Nordre Jarlsberg Brygge	[Opal, Opal-AN] Nordrum (2012)
ⓘ Skafjellåsen	[Opal]
Larvik Commune Brunlanes ⓘ Nalum	[Opal, Opal-AN] Berge (n.d.)
ⓘ Thorstein Quarry	[Opal, Opal-AN] Berge (n.d.)
Hedrum ⓘ Farmenrøysa	[Opal, Opal-AN] Larsen et al. (2009)
Lågendalen ⓘ Bratthagen 3 hillside pegmatites	[Opal, Opal-AN] Berge (n.d.)
Lysebo ⓘ Lysebo roadcut	[Opal, Opal-AN] Berge (n.d.)
Malerød ⓘ Vardåsen Quarry	[Opal] Berge (1993) +1 other reference
Pauler ⓘ Roadcut 1	[Opal] Field observarions by Peter Andresen
ⓘ Stavern (Fredriksvärn)	[Opal] Fredholm (1874) +1 other reference
Jahren pegmatite ⓘ Jahrehagen cottage grounds	[Opal, Opal-AN] Andresen et al. (2018)
ⓘ Jahren Feldspar Quarry (Jaren Feldspar Quarry)	[Opal, Opal-AN] Atle Michalsen collection
Store Arøya (Arøy) ⓘ Paradisbukta	[Opal, Opal-AN] Berge (n.d.)
Tvedalen ⓘ Tuften	[Opal] Engvoldsen et al. (1991)
ⓘ A/S Granit Quarry	[Opal] Larsen et al. (2010)
Sandefjord Fokserød ⓘ Aasmund Berg Quarries	[Opal] Engvoldsen et al. (1991)
ⓘ Hotvedt Quarry	[Opal] Berge et al. (1980) +1 other reference
Haneholmveien ⓘ Virikkollen	[Opal, Opal-AN] Larsen et al. (2012)
Østerøya ⓘ Bergan	[Opal, Opal-AN] Berge (n.d.)
ⓘ Eian	[Opal, Opal-AN] Berge (n.d.)
Yxney ⓘ Kjela	[Opal, Opal-AN] Berge (n.d.)
Råstad ⓘ Nordre Bergan	[Opal] Engvoldsen et al. (1991)
Vesterøya ⓘ Buer	[Opal] Berge et al. (2011)
ⓘ Husebyåsen prospect	[Opal] Berge (2013)
ⓘ Kamfjord Quarry	[Opal] Engvoldsen et al. (1991)
Tønsberg Ramnes ⓘ Himberg Quarry	[Opal] Andersen et al. (1994)
Vestland Sunnfjord Jølster ⓘ Jølstravatnet	[Opal] Larsen et al. (2013)
Ullensvang Hardangervidda West ⓘ Ringedalsvann area	[Opal, Opal-AN var: Hyalite] Nordrum (2015)

Oman
ⓘ Muscat Governorate	[Opal]

Pacific Ocean
Clarion-Clipperton zone ⓘ IOM claim area	[Opal] Hikov et al. (2025)
East Pacific Rise ⓘ EPR 13° N	[Opal] Econ Geol (1985)
Juan de Fuca Ridge complex North Cleft Segment ⓘ Fountain vent	[Opal, Opal var: Opaline] Friesen et al. (1995)
ⓘ Pipe Organ vent	[Opal, Opal var: Opaline] Friesen et al. (1995)
Sea of Japan Honshu Island borderland ⓘ Sado ridge	[Opal] Markov et al. (2002)
Kita-Yamato Trough ⓘ Site 799	[Opal, Opal var: Opal-A, Opal var: Opal-CT] Pisciotto et al. (1992)
South California Borderland ⓘ Hoss Seamount	[Opal, Opal var: Opal-CT] Hein et al. (2010)
Tonga-Kermadec Arc ⓘ Volcano No.19	[Opal] Schwarz-Schampera et al. (2007)
Woodlark Basin ⓘ Franklin Seamount	[Opal] Mozgova et al. (1993) +1 other reference

Pakistan
Gilgit-Baltistan Roundu District Haramosh Mountains ⓘ Stak Nala	[Opal, Opal-AN] Jose Zendrera specimen
ⓘ Rondu	[Opal, Opal-AN var: Hyalite] Jose Zendrera Collection
Shigar District Braldu Valley Nyet ⓘ Nyet Bruk	[Opal, Opal-AN var: Hyalite] Ikram Mineralogy
ⓘ Skardu Area	[Opal, Opal-AN, Opal-AN var: Hyalite] imported from Rondu District +1 other reference
Khyber Pakhtunkhwa Province Peshawar District Hameed Abad Kafoor Dheri ⓘ Zagi Mountain	[Opal, Opal-AN var: Hyalite] Collection of Mike Howard

Panama
Veraguas Province ⓘ Santa Rosa Au Mine	[Opal] Byington

Papua New Guinea
Bismarck Sea ⓘ Manus Basin	[Opal] Mozgova et al. (2004)
ⓘ Bikpela Binatang (Bikpela)	[Opal] Binns (2014)
ⓘ PACMANUS hydrothermal field	[Opal] Zhigang Zeng et al. (12)
Central Province Ofi Creek ⓘ Mount Bini Cu-Au deposit	[Opal] Dugmore et al. (1998)
ⓘ Tolukuma Mine	[Opal, Opal var: Opaline] Petromin
Milne Bay Province D'Entrecasteaux Islands Fergusson Island (Moratau) ⓘ Gameta deposit	[Opal, Opal var: Opaline] Chapple et al. (1998)
ⓘ Iamalele prospect (Airstrip prospect)	[Opal] Province et al. (2004)
ⓘ Wiyoumaga Prospect	[Opal] Province et al. (2004)
Morobe Province ⓘ Wau Mine	[Opal] Sillitoe et al. (1984)
New Ireland Province Lihir Island area Conical seamount ⓘ Karambusel vent field	[Opal] Brandl et al. (2025)
Lihir Island Luise Stratovolcano ⓘ Ladolam Gold deposit	[Opal] www.portergeo.com.au (2002)

Paraguay
Central Department Asuncion ⓘ Botanical Garden	[Opal] Petrov (n.d.)

Peru
Amazonas ⓘ Santiago river Amber occurrence	[Amber] Hyrśl (2012)
Arequipa Caravelí Province ⓘ Acarí District	[Opal] Hyrśl (2012)
ⓘ Acari Mine	[Opal, Opal var: Andean Opal, Opal var: Opal-CT] Hyrsl et al. (2003)
Ayacucho Lucanas Province Saisa District ⓘ Saisa	[Opal] Hyrśl (2012)
Cajamarca Cajamarca Province ⓘ Cajamarca District	[Opal] Lavinsky (n.d.)
ⓘ El Sol 3 deposit (Encajon)	[Opal, Opal var: Opal-CT] Dill et al. (1997)
Ica Ica Province Ica District ⓘ Monte Rosa Mine	[Opal, Opal-AN] Extra Lapis - English No. 10 Opal
Pisco Province Humay District ⓘ Lily Mine	[Opal, Opal var: Andean Opal] Locality description
ⓘ Pisco District	[Opal] Hyrśl (2012)
Puno Titicaca Lake ⓘ Amantani Island	[Opal] Jacques Valverde self collecting (summer2007) +1 other reference

Poland
Lower Silesian Voivodeship Dzierżoniów County Bielawa ⓘ Kamieniczki district ?	[Opal] Lis et al. (1986)
Gmina Niemcza Niemcza ⓘ Pangelberg	[Opal] Jahrbuch der Königlich Preussischen ... +1 other reference
Gmina Pieszyce ⓘ Kamionki	[Opal] Lis et al. (1986)
ⓘ Mount Kawka ?	[Opal] Lis et al. (1986)
Jawor County Gmina Męcinka ⓘ "Bartnica" mine (Brachów)	[Opal, Opal-AN var: Hyalite] Lis et al. (1986)
ⓘ Słup	[Opal, Opal-AN var: Hyalite] Jäkel [F.W.?] (1853)
Jelenia Góra ⓘ Sobieszów	[Amber] Traube (1888)
Kamienna Góra County Kamienna Góra ⓘ Mount Bukowina	[Opal] Lis et al. (1986)
Kłodzko County Gmina Kłodzko Wilcza ⓘ Mount Łopianka	[Opal] Lis et al. (1986)
Gmina Lądek-Zdrój ⓘ Lądek Zdrój	[Opal] Lis et al. (1986)
Gmina Nowa Ruda ⓘ Świerki	[Opal] Heflik W. et al. (1993)
ⓘ Świerki melaphyre quarry	[Opal] Heflik W. et al. (1993)
Gmina Stronie Śląskie Kletno ⓘ Żmijowiec	[Opal] Gil et al. (2019)
Legnica County Gmina Legnickie Pole Lubień ⓘ Lubień quarry	[Opal, Opal-AN var: Hyalite] Krzysztof Andrzejewski
Lubań County Gmina Leśna Grabiszyce Średnie ⓘ Grodziszcze Mountain	[Amber] Lis et al. (1986)
ⓘ Leśna	[Amber] Lis et al. (1986)
Lwówek Śląski County Gmina Lubomierz Chmieleń ⓘ Chmieleń basalt quarry	[Opal, Opal-AN var: Hyalite] Leopold von Buch 1802 - Geognostische ... +3 other references
Gmina Lwówek Śląski Płóczki Górne ⓘ Lipień Hill	[Opal] Weigel J.A.V. (1800)
Gmina Mirsk Proszowa ⓘ Urwista basalt quarry	[Opal, Opal-AN var: Hyalite] Adamczyk Z. (2008)
Strzelin County Gmina Przeworno Krzywina ⓘ Jegłowa quarry	[Opal, Opal-AN var: Hyalite] Lis et al. (1986)
Przeworno ⓘ Przeworno marble quarry	[Opal, Opal-AN var: Hyalite] Schumacher K. (1878) +1 other reference
Gmina Strzelin ⓘ Gębczyce skarn quarry	[Opal, Opal-AN var: Hyalite] Lis et al. (1986)
Świdnica County Gmina Marcinowice Wirki ⓘ 'Wiry' magnesite mine	[Opal] Harańczyk C. (1974)
Gmina Strzegom Jaroszów ⓘ Jaroszów clay pit	[Amber] Lis et al. (1986)
Strzegom ⓘ Szeroka quarry	[Opal, Opal-AN var: Hyalite] Glocker E.F. (1829)
Gmina Świdnica ⓘ Bystrzyca Górna	[Opal, Opal-AN var: Hyalite] Lis et al. (1986)
ⓘ Lubachów ?	[Opal] Lis et al. (1986)
ⓘ Lutomia Górna ?	[Opal] Lis et al. (1986)
Wałbrzych ⓘ Biały Kamień	[Amber] Lis et al. (1986)
Wałbrzych County Jedlina-Zdrój ⓘ Jedlinka	[Amber] Traube (1888)
Wrocław City ⓘ Kleczków	[Amber] Traube (1888)
Wrocław County Gmina Jordanów Śląski ⓘ Jordanów nephrite quarry	[Opal, Opal-AN, Opal var: Milk Opal, Opal-AN var: Hyalite] Szełęg
Piotrówek ⓘ Karolin	[Opal] Lis et al. (1986)
Gmina Sobótka Nasławice ⓘ Serpentinite quarry	[Opal, Opal-AN] Galuskin et al. (2003)
Sobótka ⓘ Mount Kopaniec	[Opal] Lis et al. (1986)
Ząbkowice Śląskie County Gmina Bardo ⓘ Grochowa	[Opal] Lis et al. (1986)
Gmina Ciepłowody ⓘ Koźmice	[Opal] Traube (1888)
ⓘ Koźmickie Wzgórze - Mühlberg	[Opal] Lehmann J.G. (1755)
ⓘ Gmina Ząbkowice Śląskie	[Opal, Opal var: Prase Opal] Michael W. Kieron collection
ⓘ Braszowice	[Opal] Petrov (n.d.) +1 other reference
ⓘ Szklary	[Opal] Spangenberg et al. (1949)
ⓘ Szklary Chrysoprase Mine	[Opal] Spangenberg et al. (1949)
ⓘ Szklary nickel deposit	[Opal, Opal var: Opal-CT] University of Adelaide +1 other reference
Złotoryja County Gmina Świerzawa Nowy Kościół ⓘ Jeziorna quarry	[Opal] Kuhn et al. (1918)
Gmina Zagrodno Grodziec ⓘ Grodziec basalt	[Opal] Trippke (1878)
Lublin Voivodeship Lubartów County ⓘ Górka Lubartowska amber deposit	[Amber] Państwowy Instytut Geologiczny (PIG)
Parczew County ⓘ Siemień amber deposit	[Amber] Woźny E. 1967 — Występowanie numulitów w bartonie z Siemienia koło Parczewa. Przegląd Geologiczny (In Polish)
Opole Voivodeship Namysłów County ⓘ Gmina Namysłów	[Amber] Traube (1888)
ⓘ Opole City County	[Opal-AN var: Hyalite] Roemer (1870)
ⓘ Groszowice quarry	[Opal] Traube (1888)
Pomeranian Voivodeship ⓘ Gdansk City	[Amber, Amber var: Gedanite] Flamini A. et al. (1974)
Silesian Voivodeship Bytom Bobrek ⓘ Bobrek heap	[Opal] Ł. Kruszewski EPMA/PXRD data +1 other reference
Wodzisław County Radlin ⓘ Marcel mine heap	[Opal] Kruszewski et al. (2020)
Subcarpathian Voivodeship Rzeszów County Gmina Błażowa ⓘ Futoma	[Opal] Personally collected by Zając Piotr in ...

Portugal
Aveiro Albergaria-a-Velha Branca ⓘ Palhal Mine	[Opal, Opal-AN] Marques de Sá et al. (2010)
Azores ⓘ São Miguel	[Opal] Museu Nacional de História Natural e ...
ⓘ Água de Pau Volcano	[Opal] Lavarde et al. (2019)
Terceira Angra do Heroísmo ⓘ Algar do Carvão	[Opal] Forti (2005) +1 other reference
Praia da Vitória ⓘ Branca Opala lava tube	[Opal] Daza et al. (2014)
Beja Mértola Alcaria Ruiva ⓘ Balança Mine	[Opal] Alves (n.d.)
Moura Sobral da Adiça ⓘ Preguiça Mine	[Opal, Opal-AN] Silva et al. (2026)
Odemira São Luís ⓘ Herdade dos Pendões Mine	[Opal, Opal-AN] Alves et al. (2017)
Serpa Vila Nova de São Bento e Vale de Vargo ⓘ Cêrro da Oca Mine	[Opal, Opal-AN, Opal var: Cherry Opal] Alves (n.d.)
ⓘ Bragança	[Opal] Nunes (n.d.)
Macedo de Cavaleiros ⓘ Morais	[Opal] Nunes (n.d.)
ⓘ Mogadouro	[Opal] Nunes (n.d.)
Castelo Branco Vila Velha de Ródão Vila Velha de Ródão ⓘ Sitio do Cobre Mine	[Opal, Opal-AN] Martins da Pedra collection
Évora Estremoz Glória ⓘ Mostardeira Mine	[Opal, Opal-AN] Rui Nunes collection 2012
Faro Alcoutim Martim Longo ⓘ Daroeira Mine	[Opal, Opal-AN] Alves (n.d.)
Guarda Aguiar da Beira U.F. Sequeiros e Gradiz ⓘ Penedo da Cabeça quarry	[Opal, Opal-AN] Tiago Guia's mineral collection (self-collected)
ⓘ Ratoeira quarry	[Opal, Opal-AN] Alves (n.d.)
Almeida Malpartida e Vale de Coelha Malpartida ⓘ Portugal 1 & 2 quarries	[Opal, Opal-AN] Felix Garcia Garcia Mineral Collection
Sabugal Bendada ⓘ Bendada Mines	[Opal, Opal-AN var: Hyalite] Schnorrer-Köhler et al. (1991)
ⓘ Pousafoles do Bispo (Penalobo e Lomba)	[Opal, Opal-AN] Guilherme Pedrosa collection
Leiria Alvaiázere Pelmá ⓘ Casal do Rei Mine	[Opal] LNEG - Laboratório Nacional de Energia ...
Bombarral Roliça ⓘ São Mamede Mine	[Opal] Direcção Geral de Minas
ⓘ Óbidos	[Opal] Nunes (n.d.)
Santa Maria e São Pedro e Sobral da Lagoa ⓘ Quinta do Jardim Mine	[Opal] Rui Nunes 2012
ⓘ Lisbon	[Amber] Nunes (n.d.)
ⓘ Cascais	[Amber] Nunes (n.d.)
Cascais e Estoril ⓘ Bafureira Beach	[Amber] Rui Nunes' visit on July 26
ⓘ São João do Estoril	[Amber] Nunes (n.d.)
ⓘ São Pedro do Estoril Beach	[Amber] Nunes (n.d.)
ⓘ Sintra	[Amber] Specimen found on the Estrada do ...
Torres Vedras Santa Maria - São Pedro e Matacães ⓘ Portela da Vila fossil site	[Amber] Santos et al. (2026)
Madeira Madeira Island Funchal São Martinho ⓘ Pico da Cruz	[Opal] Alves (n.d.)
Ribeira Brava Serra de Água ⓘ Boca da Encumeada pass	[Opal, Opal-AN var: Hyalite] Josep Sanchez-LaFuente i Mariol field ...
Portalegre ⓘ Castelo de Vide	[Opal] Rui Nunes 2011
ⓘ Monforte	[Opal, Opal-AN] Rui Nunes 2011
Nisa Santana ⓘ Faiopa Mine - São Miguel Mountain - Arneiro	[Opal] Martins da Pedra collection
Santarém ⓘ Rio Maior	[Opal] Rui Nunes 2011
Rio Maior ⓘ Espadanal Mines	[Opal] Rui Nunes 2011
Setúbal Barreiro Palhais e Coina Palhais ⓘ Palhais No. 1 Mine	[Opal] LNEG - Siorminp
Grândola Melides ⓘ Carvalhal Mine	[Opal] LNEG - Siorminp database information
Viana do Castelo Valença do Minho Gondomil e Safins ⓘ Eiras quarry	[Opal, Opal-AN] Alves (n.d.) +1 other reference
Vila Real Vila Pouca de Aguiar Alfarela de Jales ⓘ Jales Mines (Jales Mining Field)	[Opal] Martins (2018)
Viseu Mangualde Quintela de Azurara ⓘ Nossa Senhora da Esperança quarry	[Opal, Opal-AN]
Tavares (Chãs; Várzea e Travanca) ⓘ Bom Sucesso No. 4 quarry	[Opal, Opal-AN] Nunes (n.d.)
Sátão Ferreira de Aves Aldeia Nova ⓘ Assunção Mine	[Opal, Opal-AN] King (n.d.)
U.F Romãs Decermilo e Vila Longa ⓘ Carvalhal quarry	[Opal, Opal-AN] Nuno Afonso collection
ⓘ Fonte Limeira quarry	[Opal, Opal-AN] Rui Nunes' visit
ⓘ Gralheira Mine	[Opal, Opal-AN] Alves (n.d.)
ⓘ Romãs quarry	[Opal, Opal-AN] Alves (n.d.)

Romania	[Amber]

Alba County Roșia Montană ⓘ ~~Roşia Montană~~	[Opal] Woodside collection
Buzău County ⓘ Colţi	[Amber] Neacşu (2006)
Covasna County ⓘ Magyarhermány (Herculian)	[Opal] Zoltán Csata
Hunedoara County Băița Trestia ⓘ Trestia Mine	[Opal] Royal Ontario Museum specimen
Balșa ⓘ Techereu	[Opal, Opal var: Milk Opal] Primics (1886)
ⓘ Gurasada	[Opal] CONSTANTINA et al. (2010)
Maramureș County Cavnic Suior Mine ⓘ Cremenea vein	[Opal] Damian et al. (2008)
Cernești ⓘ Trestia	[Opal] Dana +1 other reference
Șișești Dănești village ⓘ Dănești	[Opal] Marinel Kovacs et al. (Eastern Carpathians)
Șurdești village ⓘ Șurdești	[Opal] Jude Radu (2010)
Târgu Lăpuș ⓘ Răzoare	[Opal] Udubasa et al. (1996) +1 other reference
Neamț County Piatra Neamț ⓘ Almas Valley	[Amber, Amber var: Almashite] Clark (1993)
Vâlcea County ⓘ Olanesti	[Amber, Amber var: Muntenite] Clark (1993)

Russia
Buryatia Yeravninsky District ⓘ Egitinskoe	[Opal] Ankusheva et al. (2020)
Chelyabinsk Oblast Agapovsky District ⓘ Sakharinskoye Ni deposit (Sakharinsky Mine)	[Opal] webmineral.ru (2020)
ⓘ Chelyabinsk coal basin	[Opal] Cesnokov et al. (1998)
Kartalinsky District ⓘ Verblyuzhegorskoye Cr deposit	[Opal] webmineral.ru (n.d.)
Magnitogorsk Sakhara District (Sakharinskii) Sakhara massif ⓘ Sakhara Nickel mine	[Opal] Mikhailov (2000)
Plastovsky District Svetlyi ⓘ Baturovsk quarry	[Opal] Pavel M. Kartashov (n.d.)
Vishnevye Mountains ⓘ Karavai Mt	[Opal] webmineral.ru (2016)
Irkutsk Oblast ⓘ Lena-Angara salt Basin	[Opal] Garrett (1998)
Nizhneilimsky District Zheleznogorsk-Ilimsky ⓘ Korshunovskoye iron deposit	[Opal] webmineral.ru (2016)
Kaliningrad Oblast Yantarny (Jantarny; Palmnicken) ⓘ Primorskoe amber deposit (Pal'mnickenskoe)	[Amber] Pavel M. Kartashov (n.d.) +1 other reference
ⓘ Anna Amber mine	[Amber] Princeton Museum Record ID 2359
Kamchatka Krai Bystrinsky District ⓘ Apapel’sky springs	[Opal] Okrugin
Milkovsky District Tolbachik Volcanic field Great Fissure eruption (Main Fracture) Northern Breakthrough (North Breach) First scoria cone ⓘ Northern fumarole field	[Opal] Pekov et al. (2015)
Mountain 1004 ⓘ Western paleo-fumarole field	[Opal] Pekov et al. (2025)
Ust-Bolsheretsky District ⓘ Pauzhetskaya hydrothermal field	[Opal] Frolova et al. (2010, April) +1 other reference
Ust-Kamchatsky District ⓘ Olkhovaya–1 River placer	[Opal] Sandimirova et al. (2014)
Yelizovsky District Kronotsky Reserve ⓘ Uzon Caldera	[Opal, Opal var: Opal-C, Opal var: Opal-CT] Karpov (1991) +1 other reference
ⓘ Fumarol'noye Lake	[Opal] Kirichenko et al. (2019)
ⓘ Valley of Geysers	[Opal] Sergeeva et al. (2019)
ⓘ Bolshoy geyser	[Opal] Sergeeva et al. (2019)
ⓘ Mutnovskoe	[Opal] [Der Aufschluss 1995:4 p163-180] +1 other reference
ⓘ Mutnovsky volcano	[Opal] Bortnikova et al. (2009, February) +1 other reference
ⓘ Severo‐Mutnovsky thermal fields	[Opal] Bortnikova et al. (2009, February) +1 other reference
ⓘ Rodnikovoe	[Opal] [Der Aufschluss 1995:4 p163-180] +1 other reference
Kursk Oblast Kursk Magnetic Anomaly ⓘ Mikhailovskoe Fe deposit	[Opal] Tsekhovskii et al. (2002)
Magadan Oblast Omsukchansky District ⓘ Ducat ore field	[Opal] Filimonova et al. (2008)
ⓘ Ducat Mine (Dukat Mine)	[Opal] Filimonova et al. (2010)
ⓘ Moscow	[Amber, Opal, Opal-AN] Pekin et al. (2010) +1 other reference
ⓘ Chertanovka upper reaches	[Opal] Pekin et al. (2010) +1 other reference
ⓘ Kamushki	[Opal] Pekin et al. (2010) +1 other reference
ⓘ Tyoply Stan	[Opal] Pekin et al. (2010) +1 other reference
Murmansk Oblast ⓘ Kukisvumchorr Mt	[Opal] Pekov et al. (2004)
Lovozersky District Alluaiv Mountain ⓘ Umbozero North quarry	[Opal] Pavel M. Kartashov (n.d.)
Engporr Mountain ⓘ Seidozeritovyi pegmatite #2	[Opal] Pavel M. Kartashov analytical data (2013)
Karnasurt Mountain Karnasurt mine ⓘ Palitra pegmatite	[Opal] Pekov (2005)
Seidozero Lake ⓘ Lepkhe-Nel'm Mt	[Opal] Yakovenchuk et al. (2007)
ⓘ Selsurt Mountain	[Opal] My own collection
ⓘ Ol’khon Region	[Opal, Opal-AN var: Hyalite] Skovitina et al. (2014)
Orenburg Oblast Alexandrovsky District ⓘ Sukhoy Izyak Paleoplacer	[Opal] Rakhimov et al. (2022)
Gaysky District ⓘ Gayskoe Zn-Cu deposit (Gayskoye; Gaiskoye)	[Opal] Kasatkin et al. (2019)
Kvarkensky District ⓘ Rechnoye cacholong deposit	[Opal, Opal var: Cacholong] webmineral.ru (n.d.) +1 other reference
Orsk Khalilovskii Mining District Khabarninskii massif ⓘ Akkermanovskoe deposit	[Opal] Sharkov (2009)
Khalilovskii massif (Khalilova) ⓘ Khalilovskoe Ni deposit	[Opal] Mikhailov (2000)
Svetlinsky District Buruktal Mining District ⓘ Buruktal massif	[Opal, Opal var: Prase Opal] Mikhailov (2000)
ⓘ Buruktal Mine	[Opal] Mikhailov (2000)
Primorsky Krai Dalnegorsk Urban District ⓘ Dalnegorsk	[Opal] Grant et al. (2001)
ⓘ Nikolaevskiy Mine	[Opal] Dobovol'skaya et al. (1990)
ⓘ Raduzhnoe Deposit	[Opal, Opal var: Precious Opal] Vysotskiy et al. (2010)
ⓘ Sinancha Sn deposit	[Opal] Dobrovol’skaya et al. (2008)
ⓘ Sakha	[Opal] [World of Stones 12:49]
Aldansky District Upper Amga gold-mining district ⓘ Khokhoy Gold Ore Field	[Opal] Anisimova et al. (2020)
Verkhneamginskaya auriferous zone ⓘ Upstream region of Khokhoy creek	[Opal] Kasatkin et al. (2022)
Polar Yakutia Alazeya river basin ⓘ Mustakh stream	[Opal] Igor Savin data
Sakhalin Oblast Kuril Islands Kurilsky District Iturup Island ⓘ Baranskogo hydrothermal field	[Opal] Frolova et al. (2010, April)
Bogatyr' Range ⓘ Novoe sulphur deposit	[Opal] Znamenskii V.S. et al. (1970)
Severo-Kurilsky District Atlasov Island Alaid volcano ⓘ Olimpiyskiy Fissure	[Opal] Vergasova et al. (1977) +1 other reference
Paramushir Island ⓘ Ebeco Volcano (Ebeko Volcano)	[Opal] Shevko et al. (2018)
Yuzhno-Kurilsky District Kunashir Island ⓘ Mendeleev volcano (Ruasu-dake)	[Opal] L.M. Lebedev data
Sakhalin Island Dolinsky district Starodubskoye ⓘ Starodubskoe amber deposit	[Amber] Pavel M. Kartashov (n.d.)
ⓘ Yantarnaya river	[Amber] Pavel M. Kartashov (n.d.)
Nevelsky District ⓘ Unnamed mudstone	[Opal] Koichi Momma et al. (2018)
ⓘ Zamiraylova Golova cape	[Opal] Koichi Momma et al. (2018)
Samara Oblast ⓘ Vodinskoe deposit	[Opal] Pekov (1998)
Stavropol Krai Lermontov Beshtau Mountain ⓘ Mine no. 1	[Opal]
ⓘ Gremuchka ore zone	[Opal] Pekov (1998)
Sverdlovsk Oblast Beryozovsky ⓘ Berezovsk deposit	[Opal]
Ural Mountains ⓘ Polar Urals	[Opal] Hyršl (1992)
Yamalo-Nenets Autonomous Okrug Labytnangi ⓘ Ozernoe Occurrence	[Opal] Murzin et al. (2022)
ⓘ Lower Berezovskaya subformation	[Opal] Zueva et al. (2023)
Zabaykalsky Krai Nerchinsky District Adun-Cholon Range ⓘ Sherlova Gora	[Opal] Kasatkin et al. (2014)
Ononsky District Durulgui granite-pegmatite system ⓘ Dedova Gora W deposit	[Opal] Pavel M. Kartashov's data

Rwanda
Western Province Ngororero District Muhororo ⓘ Buranga pegmatite	[Opal] Daltry et al. (1998)

Saint Lucia
Soufrière ⓘ Sulphur Springs	[Opal] A Mars Analogue Site. Masters Thesis +1 other reference

Saudi Arabia
Mecca Region ⓘ Hibashi Cave	[Opal, Opal var: Opal-C] Saudi Geological Survey Open-File ...

Serbia
Central Serbia Jablanica District Medveđa Lece volcanic complex ⓘ Bučumet deposit	[Opal] Miladinović et al. (2016)
ⓘ Lece underground Mine	[Opal] Ministry of Mining and Energy (2002)
ⓘ Sokolov Vis agate occurrence	[Opal, Opal var: Opal-CT] Miladinović et al. (2024)
ⓘ Vlasovo quarry	[Opal, Opal var: Opal-C, Opal var: Opal-CT] Miladinović et al. (2024)
Mačva District Loznica Jadar valley ⓘ Jadar lithium deposit	[Opal, Opal var: Opal-A] Putzolu et al. (2025)
Moravica District Gornji Milanovac ⓘ Boblija deposit	[Opal, Opal var: Common Opal] Miladinović et al. (2016)
Pčinja District Bujanovac ⓘ Bujanovac occurrence	[Opal] Ministry of Mining and Energy (2002) +1 other reference
Raška District Kraljevo City ⓘ Lojanik deposit	[Opal, Opal var: Common Opal] Miladinović et al. (2016)
Šumadija District Knic ⓘ Vučkovica deposit	[Opal] doi.org (n.d.) +1 other reference
Kragujevac ⓘ Ramaća deposit	[Opal, Opal var: Common Opal] Miladinović et al. (2016)

Slovakia
Banská Bystrica Region Banská Bystrica District Badín ⓘ Badín andesite quarry	[Opal, Opal var: Wax Opal] Koděra (1986)
Horné Pršany ⓘ Horné Pršany outcrops	[Opal] Koděra (1986)
Hrochoť ⓘ Kyslinky	[Opal, Opal var: Milk Opal] Koděra (1986)
Ľubietová ⓘ Jamešná deposit	[Opal, Opal-AN, Opal var: Jasper Opal, Opal var: Opal-CT, Opal var: Wax Opal] Mesiarkinová et al. (2009)
ⓘ Posádka	[Opal] Grecula (1995)
ⓘ Tri Vody	[Opal, Opal-AN, Opal var: Hydrophane, Opal var: Wax Opal] Koděra (1986)
ⓘ Francisci mine	[Opal] Grecula (1995)
Malachov ⓘ Malachov mercury deposit	[Opal] Koděra (1986)
Poniky ⓘ Ponická Huta	[Opal, Opal-AN, Opal var: Milk Opal, Opal var: Wax Opal] Koděra (1986)
Povrazník ⓘ Povrazník occurrence	[Opal, Opal var: Fire Opal, Opal var: Milk Opal] Ďuďa R.
ⓘ Strelníky	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Milk Opal] Pauliš
Tajov ⓘ Tajov arsenic deposit	[Opal] Kodě +1 other reference
Banská Štiavnica District Banská Belá Banská Belá Au-Ag deposit ⓘ Zeolite occurrence	[Opal, Opal var: Hydrophane] Koděra (1986)
ⓘ Banská Štiavnica	[Opal, Opal-AN] Lexa et al. (1999)
ⓘ Banky	[Opal, Opal-AN] Koděra (1986)
ⓘ Červená Studňa	[Opal] Lexa et al. (1999)
ⓘ Kremenisko	[Opal] S.Šimko
ⓘ Banský Studenec	[Opal] Koděra (1986)
ⓘ Dekýš	[Opal] Lexa et al. (1999)
ⓘ Podhorie	[Opal] Koděra (1986)
ⓘ Svätý Anton	[Opal, Opal var: Jasper Opal] Koděra (1986)
Brezno District ⓘ Jarabá	[Opal, Opal-AN] Koděra (1986)
Detva District ⓘ Detva	[Opal, Opal-AN, Opal var: Hydrophane, Opal var: Milk Opal, Opal var: Wax Opal] Koděra (1986)
ⓘ Hriňová	[Opal, Opal-AN] Koděra (1986)
ⓘ Zánemecká	[Opal] Ivanov M. (1979)
ⓘ Vígľašská Huta-Kalinka	[Opal] Rojkovičová
Krupina District ⓘ Bzovík	[Opal, Opal-AN] Koděra (1986)
Hontianske Nemce ⓘ Sitnianska Lehôtka	[Opal, Opal-AN, Opal var: Hydrophane, Opal var: Milk Opal, Opal var: Precious Opal, Opal var: Wash Opal, Opal var: Wax Opal] Koděra (1986)
Lučenec District ⓘ Belina	[Opal, Opal-AN] Koděra (1986)
ⓘ Bulhary	[Opal] Koděra (1986)
Revúca District Sirk ⓘ Železník iron deposit	[Opal] Grecula (1995)
Veľký Krtíš District ⓘ Pôtor	[Opal] Koděra (1986)
Žarnovica District Hodruša-Hámre ⓘ Hodruša-Hámre mines	[Opal] Koděra (1986)
Nová Baňa ⓘ Nová Baňa deposit	[Opal, Opal-AN] Koděra (1986)
Tekovská Breznica ⓘ Brehy quarry	[Opal, Opal-AN] Koděra (1986)
Žarnovica ⓘ Žarnovická Huta	[Opal, Opal var: Wax Opal] Koděra (1986)
Žiar nad Hronom District ⓘ Bartošova Lehôtka	[Opal] Koděra (1986)
Hliník nad Hronom ⓘ Hliník nad Hronom rhyolite quarry	[Opal, Opal-AN] Koděra (1986)
ⓘ Jastrabá	[Opal] Koděra (1986)
ⓘ Ihráčska Píla wood opal occurrence	[Opal] Koděra (1986)
ⓘ Kopernica	[Opal] Koděra (1986)
Kremnica ⓘ Kremnica Au-Ag deposit	[Opal, Opal-AN] Ďuďa (1993)
Ladomerská Vieska ⓘ Ladomerská Vieska quarry	[Opal] Daniel Ozdín collection
ⓘ Lutila	[Opal] Koděra (1986)
ⓘ Nevoľné	[Opal, Opal-AN] Koděra (1986)
ⓘ Prochot	[Opal] Koděra (1986)
ⓘ Sklené Teplice	[Opal, Opal-AN, Opal var: Jasper Opal, Opal var: Milk Opal] Koděra (1986)
Slaská ⓘ Slaská quarry	[Opal, Opal-AN, Opal var: Jasper Opal] Koděra (1986)
Stará Kremnička ⓘ Stará Kremnička quarry	[Opal] Pauliš
Zvolen District Lešť ⓘ Švihranka	[Opal, Opal-AN] Koděra (1986)
Bratislava Region Pezinok District Pezinok ⓘ Ferdinand and Augustín Mine	[Opal, Opal-AN] Koděra (1986)
ⓘ Kolársky vrch deposit	[Opal] Uher et al. (2000)
Košice Region Gelnica District Gelnica Krížová vein ⓘ Slovenské cechy	[Opal] Pauliš et al. (2002)
Košice-okolie District ⓘ Herľany	[Opal, Opal-AN, Opal var: Milk Opal, Opal var: Moss Opal, Opal var: Wax Opal] Koděra (1986)
ⓘ Hodkovce	[Opal] Koděra (1986)
ⓘ Kalša	[Opal, Opal-AN] Koděra (1986)
ⓘ Kecerovský Lipovec	[Opal, Opal-AN] Koděra (1986)
Košický Klečenov ⓘ Dargov quarry	[Opal, Opal-AN, Opal var: Wax Opal] Pauliš et al. (2002)
ⓘ Ruskov	[Opal, Opal-AN] Koděra (1986)
Slanec ⓘ Slanec quarry	[Opal, Opal-AN, Opal var: Milk Opal] Pauliš et al. (2002)
ⓘ Vyšná Kamenica	[Opal] Matúš Škutka
Michalovce District Jovsa ⓘ Opal occurrence	[Opal, Opal-AN, Opal var: Opal-CT, Opal var: Wax Opal] Koděra (1986)
Poruba pod Vihorlatom ⓘ Quartzite outcrops	[Opal, Opal-AN] Koděra (1986)
ⓘ Trnava pri Laborci	[Opal, Opal var: Wax Opal] Koděra (1986)
Vinné ⓘ Šutová	[Opal] Koděra (1986)
Rožňava District ⓘ Betliar	[Opal, Opal-AN] Koděra (1986)
ⓘ Dobšiná	[Opal] Koděra (1986)
ⓘ Teliatko serpentinite body	[Opal] Ozdín D. & Števko M.
Kečovo ⓘ Domica Cave	[Opal] Cílek (1999)
Ochtiná ⓘ Hrádok hill	[Opal] Koděra (1986)
ⓘ Ochtinská aragonite cave	[Opal] Koděra (1986)
Sobrance District ⓘ Remetské Hámre	[Opal, Opal-AN] Bacsó
ⓘ Morské oko	[Opal] Koděra (1986)
Vyšné Nemecké ⓘ Močidlá	[Opal] Matúš Škutka
Spišská Nová Ves District ⓘ Markušovce	[Opal] Koděra (1986)
Trebišov District Bačkov ⓘ Pod Lipovým kameňom	[Opal, Opal-AN var: Hyalite] Pavol Myšľan Collection +1 other reference
ⓘ Brezina	[Opal, Opal-AN] Pauliš et al. (2002)
Kuzmice ⓘ Quartz veins	[Opal, Opal-AN, Opal var: Moss Opal] Koděra (1986)
ⓘ Slivník	[Opal, Opal-AN] Koděra (1986)
Zemplín ⓘ Chalcedony occurrence	[Opal] Kaličiak
Nitra Region Levice District ⓘ Brhlovce	[Opal, Opal-AN, Opal var: Jasper Opal] Koděra (1986)
ⓘ Devičany	[Opal, Opal-AN, Opal var: Wax Opal] Koděra (1986)
Kalná nad Hronom ⓘ Mochovce	[Opal] Albert Russ specimens
ⓘ Kozárovce	[Opal] Koděra (1986)
ⓘ Levice	[Opal] Koděra (1986)
ⓘ Pukanec	[Opal, Opal-AN, Opal var: Wax Opal] Koděra (1986)
Veľký Ďur ⓘ Rohožnica	[Opal] Wood Opals From Velky Dur
Prešov Region Kežmarok District ⓘ Holumnica	[Opal] Koděra (1986)
Poprad District Hôrka ⓘ Kišovce	[Opal] Koděra (1986)
Poprad ⓘ Kvetnica	[Opal] Pauliš
Tatranská Javorina ⓘ Podspády	[Amber] Koděra (1986)
ⓘ Vikartovce	[Opal] Koděra (1986)
Prešov District ⓘ Červenica	[Opal] Mason (1976)
ⓘ Dubník	[Opal, Opal var: Milk Opal, Opal var: Onyx Opal, Opal-AN var: Hyalite] Koděra (1986) +1 other reference
ⓘ Libanka	[Opal, Opal-AN, Opal var: Cacholong, Opal var: Fire Opal, Opal var: Hydrophane, Opal var: Jasper Opal, Opal var: Milk Opal, Opal var: Opal-Agate, Opal var: Precious Opal, Opal var: Wax Opal] Koděra (1986)
ⓘ Jozef adit	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Precious Opal] Personally collected by S.Šimko in 1994
ⓘ Slávik adit	[Opal, Opal-AN, Opal var: Hydrophane, Opal var: Milk Opal, Opal var: Precious Opal] Koděra (1986)
ⓘ Lesíček	[Opal, Opal var: Jasper Opal, Opal var: Wax Opal] Koděra (1986)
Vyšná Šebastová ⓘ Maglovec quarry	[Opal] Ďuďa
Zlatá Baňa ⓘ Zlatá Baňa deposit	[Opal, Opal-AN, Opal var: Hydrophane] Duda et. all.
ⓘ Antimony deposit	[Opal] Koděra (1986)
ⓘ Base metal deposit	[Opal] Ďuďa R. (2001)
Snina District ⓘ Ladomirov	[Opal, Opal-AN] Pauliš
Stará Ľubovňa District Šarišské Jastrabie ⓘ Šarišské Jastrabie deposit	[Opal] Koděra (1986)
Vranov nad Topľou District Banské ⓘ Banské outcrop	[Opal, Opal var: Wax Opal] Koděra (1986)
ⓘ Hermanovce nad Topľou	[Opal] Koděra (1986)
Juskova Voľa ⓘ Juskova Voľa quarry	[Opal] Duda et all.
Vechec ⓘ Vechec quarry	[Opal, Opal-AN] Ďuďa
ⓘ Zámutov	[Opal, Opal var: Wax Opal] Koděra (1986)
Trenčín Region Prievidza District ⓘ Handlová	[Opal] Koděra (1986)
ⓘ Handlová coal mine	[Opal, Opal-AN] Slavomir ŠIMKO
ⓘ Vysoká hill	[Opal] S.Šimko
Lehota pod Vtáčnikom ⓘ Lehota pod Vtáčnikom quarries	[Opal] Gabriel Gajarsky specimen
Trnava Region Trnava District Lošonec ⓘ Lošonec Quarry	[Opal] Koděra (1986)
Žilina Region Dolný Kubín District ⓘ Zázrivá	[Opal] Koděra (1986)
Liptovský Mikuláš District Malužiná ⓘ Svidovo	[Opal] Koděra (1986)
Partizánska Ľupča ⓘ Magurka Au-Sb deposit	[Opal, Opal-AN] Koděra (1986)
Turčianske Teplice District ⓘ Turček	[Opal] Koděra (1986)

Somalia
Somaliland ⓘ Awdal	[Opal, Opal var: Precious Opal] Wolfgang Hampel specimen
Jodha ⓘ Qabri Bahar	[Opal, Opal var: Precious Opal] Journal of Gemmology (2002)

South Africa
Gauteng City of Tshwane Metropolitan Municipality ⓘ Vergenoeg Mine	[Opal, Opal-AN var: Hyalite] Atanasova et al. (2016)
West Rand District Municipality Mogale City Local Municipality Muldersdrift ⓘ Muldersdrif ultramafic complex	[Opal] Anhaeusser et al. (1978)
KwaZulu-Natal Ugu District Municipality ⓘ Marble Delta	[Opal] Cairncross et al. (1995)
Limpopo Capricorn District Municipality Blouberg Local Municipality ⓘ Vivo	[Opal] Cairncross et al. (1995)
Waterberg District Municipality Modimolle-Mookgophong Local Municipality Mookgophong ⓘ Buffalo Fluorspar Mine	[Opal, Opal-AN] Wolfgang R. Windisch personal list.
Mpumalanga Ehlanzeni District Municipality Mbombela Local Municipality Barberton ⓘ Bon Accord Ni deposit	[Opal] de Waal (1969)
Mbombela ⓘ Mbobo Mkulu Cave	[Opal] Martini (1997)
Nkangala District Municipality Victor Khanye Local Municipality Delmas ⓘ Argent	[Opal] Atanasova et al. (2016)
Dwarsfontein Farm Transvaal Mine ⓘ East Trench	[Opal, Opal-AN var: Hyalite]
North West Bojanala Platinum District Municipality Madibeng Local Municipality Brits ⓘ Slipfontein	[Opal] Atanasova et al. (2016)
Moses Kotane Local Municipality Pilanesberg Alkaline Ring Complex ⓘ Pilanesberg Mountain	[Opal] Cairncross et al. (1995)
Northern Cape John Taolo Gaetsewe District Municipality Joe Morolong Local Municipality Black Rock ⓘ Black Rock Mine	[Opal] Am Min 53:495
Hotazel ⓘ Hotazel Mine	[Opal] Pohl et al. (1991)
Namakwa District Municipality Khâi-Ma Local Municipality ⓘ Pella	[Opal] Cairncross et al. (1995)
Nama Khoi Local Municipality Henkries ⓘ Henkries uranium deposit	[Opal] Eriksson (1997)
ⓘ Postmasburg manganese field	[Opal] Cairncross et al. (1995)
ZF Mgcawu District Municipality Kai !Garib Local Municipality Kenhardt ⓘ Straussheim I pegmatite	[Opal, Opal-AN] Luetcke (n.d.)
Western Cape West Coast District Municipality Cederberg Local Municipality ⓘ Elands Bay Cave	[Opal] Miller et al. (2016)

South Korea
Gangwon Province Chongson-gun Tong-myon Hwaam-ni ⓘ Hwapyo Mine	[Opal] Kinosaki (1941)

Spain
Andalusia Almería Bayarque ⓘ San José Mine	[Opal] Propuestas para explotación de mineral de mercurio en la Península Ibérica. Datos complementarios para la investigación en el S.E." (Madrid, 1968)
Cuevas del Almanzora ⓘ Los Lobos	[Opal, Opal var: Oolitic Opal] Calvo Rebollar (2016)
ⓘ Volcanica quarry	[Opal] Calvo Rebollar (2016)
Las Tres Villas Escúllar ⓘ General mines (Cortijo Virginia)	[Opal] José Miguel Sola
Níjar Cabo de Gata volcanic complex ⓘ Agua Amarga	[Opal, Opal var: Moss Opal] Calvo Rebollar (2016)
ⓘ La Isleta del Moro	[Opal, Opal var: Moss Opal] Calvo Rebollar (2016)
ⓘ Rodalquilar	[Opal] Joaquim Mollfulleda
ⓘ Mina San Diego	[Opal] ...
Granada Galera ⓘ Gypsum outcrop	[Opal] Calvo Rebollar (2016)
Huelva Zufre ⓘ Juanito Mine	[Opal] Calvo Rebollar (2016)
Jaén Pozo Alcón ⓘ El Negral quarry	[Opal] José Miguel Sola. Multiple methods
Málaga Mijas ⓘ Por Fin mine	[Opal] Romero Silva (2003)
Aragon Teruel Loscos ⓘ Road to Bádenas	[Opal] Calvo Rebollar (2008)
ⓘ Utrillas	[Amber] Penalver et al. (2007)
ⓘ Coal outcrops	[Amber] Rui Nunes 2018
ⓘ San Just	[Amber] Penalver et al. (2007)
Zaragoza Morés Purroy ⓘ San Pedro Mine (Toria Quarry)	[Opal] Calvo Rebollar (2008)
Canary Islands Las Palmas Province ⓘ Gran Canaria	[Opal, Opal var: Precious Opal] Extra Lapis - English No. 10 Opal
Agaete ⓘ Barranco de Guayedra	[Opal] María Jesús Mediavilla collection
La Aldea de San Nicolás Anden Verde ⓘ Montaña Aserrada	[Opal] Mullis et al. (1982)
Las Palmas de Gran Canaria ⓘ Cantera de La Esfinge	[Opal, Opal-AN] Personally collected in January 2013 +1 other reference
ⓘ Mogán	[Opal, Opal-AN] Graetsch (1996)
ⓘ Degollada de Veneguera	[Opal, Opal-AN] Zeolite collcetion of Volker Betz
ⓘ Lomo de Veneguera	[Opal] Ternes (1995)
Lanzarote Tinajo ⓘ Tinguatòn	[Opal] Sauro et al. (2021) +2 other references
Santa Cruz de Tenerife Province Tenerife Santa Cruz de Tenerife Taganana ⓘ Nepheline outcrop	[Opal] Bustillo (2003)
Cantabria ⓘ Comillas	[Amber] Rui Nunes' mineral collection (2018)
Herrerías ⓘ El Soplao outcrop	[Amber] Najarro et al. (2010)
Miengo Cuchía ⓘ Cuchía quarry	[Amber] Rui Nunes 2018
Reocín ⓘ Reocín Mine	[Amber] López (n.d.)
Castile-La Mancha Albacete ⓘ Elche de la Sierra	[Opal] Juan Miguel Casanova Honrubia ...
Hellín ⓘ Agramón	[Opal] INTAN (Barcelona)
ⓘ Embalse de Camarillas	[Opal] INTAN specimens (Barcelona)
Cancarix lamproite intrusion ⓘ Sierra de las Cabras	[Opal] Juan Miguel Segura specimen +1 other reference
ⓘ Coto Menor mines	[Opal] MTI Mineralogía Topográfica Ibérica
Ciudad Real Bolaños de Calatrava ⓘ Herrerías Volcano (Las Herrerías quarry)	[Opal] Calvo et al. (2013)
ⓘ Campo de Calatrava volcanic field	[Opal, Opal-AN] Martins da Pedra collection
Castile and Leon Segovia ⓘ Alconada de Maderuelo	[Opal] Fernández Macarro et al. (1988)
ⓘ Miocene outcrops	[Opal] Fernández Macarro et al. (1988)
Zamora ⓘ La Tuda	[Opal] Fabre (n.d.)
Catalonia Barcelona Baix Llobregat Gavà Bruguers ⓘ Elvira Mine	[Opal] Rosell-Riba et al. (2022)
Barcelonès Barcelona city ⓘ Montjuïc	[Opal] Carles Curto Mila collection
Maresme Tordera ⓘ Rialls quarry (Montpalau quarry)	[Opal, Opal-AN] Marc C collection
Vallès Occidental-Baix Llobregat Sant Cugat del Vallès-El Papiol ⓘ Berta quarry and mine	[Opal]
Vallès Occidental Montcada i Reixac ⓘ Montcada Hill Quarry	[Opal] Mineralogistes de Catalunya (1997)
Vallès Oriental Aiguafreda ⓘ Els Frares quarry (Riera d'Avencó; Riera d'Avençó)	[Opal] Bareche (2005)
Sant Fost de Campsentelles ⓘ Can Donadeu quarry	[Opal] Laura Palacios Pérez
Girona Alt Empordà ⓘ Darnius	[Opal] Joaquim Mollfulleda
Maçanet de la Selva ⓘ Can Súria quarry (Sant Ramón quarry; Guixeres quarry)	[Opal] Martí Rafel - Dr. Joan Viñals
Osona ⓘ Viladrau	[Opal] Petrov (n.d.)
ⓘ La Erola pegmatite field	[Opal] field collected by Alfredo Petrov
Osor ⓘ Osor Mines	[Opal]
Selva Caldes de Malavella ⓘ Camp dels Ninots	[Opal, Opal var: Hydrophane, Opal var: Precious Opal] Laura Palacios Pérez
Sils Massabè ⓘ Mas Sever Quarry	[Opal, Opal var: Hydrophane, Opal var: Precious Opal] Joaquim Mollfulleda
Tarragona Priorat Bellmunt del Priorat ⓘ Joaquina primera mine	[Opal] Joan Abella i Creus (2008)
ⓘ Regia mine	[Opal]
Community of Madrid ⓘ Bustarviejo	[Opal]
ⓘ Cadalso de los Vidrios	[Opal] Garcia G. et al. (2004)
Fuenlabrada ⓘ Cerro de la Coronilla outcrop	[Opal] Geominero Museum collection
ⓘ La Cabrera	[Opal] González del Tánago et al. (2008)
ⓘ La Cabrera pluton	[Opal] Tánago et al. (2012)
Madrid Vicálvaro ⓘ Almodóvar Hill	[Opal] Calvo Rebollar (2016)
ⓘ Casa Montero	[Opal] Bustillo et al. (2005)
Soto del Real ⓘ Las Calerizas	[Amber] www.foro-minerales.com (n.d.)
Torrejón de Velasco ⓘ Batallones Hill	[Opal] www.foro-minerales.com (2017)
Valdemanco ⓘ El Madroñal Quarry (La Cabrera pluton)	[Opal] González del Tánago et al. (2008)
ⓘ Isabel Quarry (La Saludadora Quarry; La Cabrera pluton)	[Opal] Collection of the Geominero Museum of ...
ⓘ Los Alisos W Quarry (La Cabrera pluton)	[Opal] González del Tánago et al. (2008)
ⓘ Peña Mojada Quarry (Los Alisos E Quarry; La Cabrera pluton)	[Opal] González del Tánago et al. (2008)
Galicia A Coruña Santa Comba ⓘ Santa Comba Mine (Barilongo mine)	[Opal] Carlos J. Rodríguez
Ourense Viana do Bolo ⓘ Penouta mines	[Opal, Opal-AN] Hamid +9 other references
Pontevedra Ponteareas ⓘ Cillarga Quarry	[Opal] Calvo et al. (2009)
Porriño ⓘ Porriño quarries	[Opal] Calvo et al. (2009)
Murcia Cartagena La Aljorra ⓘ La Aljorra Quarries	[Opal] Sevillan et al. (2009)
Llano del Beal ⓘ Emilia open pit	[Opal] FMF Forum
La Unión ⓘ Brunita open pit (Brunita Quarry)	[Opal, Opal-AN]
La Fortuna ⓘ Tomasa Mine	[Opal, Opal-AN]
ⓘ San Valentín Mine	[Opal] FMF Forum
ⓘ Mazarrón	[Opal] Joan Rosell. RosellMinerals
Mula ⓘ Mula lamproite dike	[Opal] Fuster et al. (1967) +2 other references
Valencian Community Alicante Agost ⓘ Sierra del Castellar	[Amber] Juan Miguel Casanova
Alicante Co. Serreta Llarga ⓘ Cemex quarries	[Amber] Honrubia et al. (2002)
Petrel ⓘ Caprala	[Opal] González (2023)
Castellón Cortes de Arenoso ⓘ La Hoya deposit	[Amber] Rui Nunes 2018
Valencia Barxeta ⓘ Tozal Negro quarry	[Opal] Honrubia et al. (2002)

Sri Lanka
Southern Province Galle District ⓘ Meetiyagoda	[Opal] Dissanayake et al. (2000)

Sweden
Norrbotten County Jokkmokk ⓘ Ultevis	[Opal]
Kiruna Svappavaara ⓘ Leveäniemi Mine	[Opal, Opal-AN var: Hyalite] Lorin (2022)
Örebro County Nora Timansberg ⓘ Rökärrs Mine	[Opal] Gatedal (n.d.)
Skåne County Osby ⓘ Osby quarry	[Opal] Swedish Nat. Museum
Svedala ⓘ Börringe	[Amber] eg NRM 19010038
Vellinge ⓘ Skanör	[Amber] The Swedish Museum of Natural History
Ystad ⓘ Kåseberga	[Amber] Håkan Hansson photo
Värmland County Filipstad Långban Ore District ⓘ Långban Mine	[Opal] Metropolis (1988) +1 other reference
Nordmark mining district Jakobsberg ore field ⓘ Jakobsberg Mine	[Opal]

Switzerland
Bern Interlaken-Oberhasli ⓘ Guttannen	[Opal, Opal-AN] Stalder et al. (1998)
Oberaar lake area Triebten lake (Trübten lake) ⓘ Breccia outcrop	[Opal, Opal-AN] Stalder et al. (1998)
Fribourg Sense Plasselb ⓘ Plasselbschlund	[Amber, Amber var: Plaffeiite] Stalder et al. (1998)
Grisons Albula Region Surses Tinizong (Tinzen) Err valley ⓘ Parsettens Alp	[Opal, Opal-AN]
Surselva Region Medel (Lucmagn) Val Medel ⓘ Val Cristallina	[Opal, Opal-AN] Stalder et al. (1998)
Ticino Bellinzona Bellinzona ⓘ Sementina	[Opal, Opal-AN] Stalder et al. (1998)
Leventina Prato (Leventina) Fiesso ⓘ Lake Tremorgio	[Opal, Opal-AN] Stalder et al. (1998)
Lugano Carona ⓘ Madonna d'Ongero	[Opal, Opal-AN] Stalder et al. (1998)
Valais Goms Binn ⓘ Gischi glacier (incl. Gischihorn)	[Opal, Opal-AN]
ⓘ Wanni glacier - Scherbadung area (Monte Cervandone)	[Opal, Opal-AN var: Hyalite] Schwanz et al. (1994)
Martigny Mont Chemin mining district ⓘ Tête des Econduits	[Opal, Opal-AN]
Östlich Raron Grengiols ⓘ Chummibort	[Opal, Opal-AN var: Hyalite] Gorsatt (Ed.)
ⓘ Hillehorn northeast slope	[Opal, Opal-AN] Cuchet et al. (2005)
Vaud Aigle Lavey-Morcles Lavey-les-Bains ⓘ Boitses (Les Boitses)	[Opal, Opal-AN] Meisser (2012)

Syria	[Amber]

Quneitra Governorate ⓘ Mt Hermon	[Amber] Poinar (1992)

Tajikistan
Gorno-Badakhshan Ishkoshim ⓘ Kukh-i-Lal (Kukhilal; Kuhi-lal)	[Opal] Паутов et al. (2019)
Sughd Mastchoh District Altyn-Topkan ore field (Zarnisor ore field) ⓘ Altyn-Topkan deposit (Altyntopkan deposit; Altyn-Topkan Mine; Zarnisor deposit; Zarnisori Shimoli deposit; Northern Zarnisor deposit)	[Opal] Xinjiang Tacheng International Resources Ltd.

Tanzania	[Opal, Opal var: Prase Opal]

Arusha region Ngorongoro District ⓘ Olduvai Gorge	[Opal] Hay (1970)
Dodoma Region Chamwino District ⓘ Haneti-Itiso area	[Opal, Opal var: Prase Opal] Schmetzer et al. (1976)
ⓘ Iyobo Mountain	[Opal, Opal var: Opal-A, Opal var: Prase Opal] Shigley et al. (2009)
Manyara Region ⓘ Manghola	[Opal] www.ganoksin.com (2008)
Simanjiro District ⓘ Mwajanga diggings	[Opal] John A. Jaszczak collection
Tanga Region Korogwe Rural District ⓘ Umba River (Umba Valley)	[Opal]

Thailand
Chonburi Province ⓘ Khao Kaew	[Opal, Opal var: Opal-A, Opal var: Opal-CT] Mustoe et al. (2022)
Nakhon Ratchasima Province Nakhon Ratchasima District ⓘ Nakhon Ratchasima (Khorat; Korat; Nakorn Rajsima)	[Opal, Opal var: Opal-Agate] C. Lemanski (visited, collected & photographed)
Tak Province Ban Tak ⓘ Petrified Wood Forest Park	[Opal] Mustoe et al. (2022)

Togo
Plateaux Region Mont Haïto Kpoté ⓘ Mont Haïto Ni-Co-prospect	[Opal] Wolfgang Hampel (2013)

Tunisia
Gafsa Métlaoui ⓘ Oum el-Kecheb Mine	[Opal, Opal var: Opal-CT] GALFATI et al. (2010) +1 other reference

Turkey
Aksaray Province Aksaray District Aksaray ⓘ Kaolin and alunite deposits	[Opal, Opal var: Opal-CT] Çelik Karakaya et al. (2021)
Ankara Province Beypazari District ⓘ Beypazarı trona deposit	[Opal, Opal var: Opal-CT] Helvaci (1998)
ⓘ Polatlı District	[Opal, Opal var: Opal-CT] Temel et al. (2010)
Artvin Province Şavşat District ⓘ Şavşat Camp	[Opal] SOYLU et al. (1999)
Balikesir Province Bigadiç District ⓘ Bigadiç Mine	[Opal] Helvaci +2 other references
Faraşköy ⓘ Kurtpınarı mine	[Opal] Helvaci et al. (2000) +1 other reference
Sındırgı District Mumcu ⓘ Baglar Hill	[Opal] Oygür (1997)
Susurluk District Sultançayırı ⓘ Sultançayırı Mine	[Opal, Opal var: Opal-CT] Helvaci et al. (2000) +1 other reference
ⓘ Tuztasi prospect	[Opal] Özbaş et al. (2025)
Bursa Province Mustafakemalpaşa District ⓘ Kestelek Mine	[Opal] Helvaci et al. (2000) +1 other reference
Çanakkale Province Ayvacık District ⓘ Kısacık deposit (Baharlar)	[Opal, Opal var: Opaline] Yigit (2012)
Bayramiç District ⓘ Dede Dagi prospect	[Opal, Opal var: Opaline] Yigit (2012)
Çan District ⓘ Hamamtepe silica site	[Opal] Ercan et al. (2022)
Çanakkale ⓘ Kirazlı	[Opal, Opal var: Opaline] Aluç et al. (2025)
Lapseki District ⓘ Adatepe prospect	[Opal, Opal var: Opaline] Yigit (2012)
ⓘ Kestanelik deposit	[Opal] Kiray et al. (2024)
Diyarbakir Province Ergani District Ergani ⓘ Ergani Mine	[Opal, Opal var: Opaline] Akinci (2009)
Erzurum Province Aşkale District Kop Daglari ⓘ Kop Krom mine	[Opal] Dietrich et al. (2001)
Eskişehir Province ⓘ Saricakaya District	[Opal] Ferdinando Giovine specimen
Sivrihisar District ⓘ Kaymaz Gold Project	[Opal] Yahya Çiftçi et al. (2013)
İzmir Province Menderes District ⓘ Gümüldür	[Opal, Opal var: Fire Opal] KARACIK +3 other references
Kütahya Province Gediz District Murat Dagi ⓘ Dereköy mine	[Opal] Aral (1989)
ⓘ Göynük mine	[Opal] Aral (1989)
ⓘ Nalkaya mine	[Opal] Aral (1989)
Pazarlar District ⓘ Şaphane alunite deposit	[Opal, Opal var: Opal-CT] Mutlu et al. (2005)
ⓘ Şaphane Dagi fire opal deposit	[Opal, Opal var: Fire Opal] M. Hatipoglu et al. (2009)
ⓘ Simav District	[Opal, Opal var: Fire Opal] Esenli et al. (2001)
Manisa Province Turgutlu District ⓘ Çaldağ Mine	[Opal] Gülyüz et al. (2024)
ⓘ South-Eastern Anatolia Region	[Amber] various photographs

UK
ⓘ England	[Amber] Mason (1976)
Bournemouth， Christchurch and Poole ⓘ Bournemouth	[Amber] Kirejtshuk et al. (2008)
Cornwall ⓘ Breage	[Opal, Opal var: Opal-Jasper] [Specimen in the Natural History Museum
Calstock Gunnislake ⓘ Hingston Down Quarry	[Opal] Weiss et al. (2007)
Camborne North Roskear ⓘ North Roskear Mine	[Opal] Hall (1868) +1 other reference
South Roskear group (Pendarves Consols) ⓘ Wheal Gerry (Higher Rosewarne Mine; incl. Wheal Chance)	[Opal, Opal var: Fire Opal] Phillips (1823)
Troon Grenville United Mines ⓘ Wheal Gine (Wheal Polgine)	[Opal] Phillips (1823)
Carharrack Wheal Damsel United Mines ⓘ West Wheal Damsel (Wheal Spinster)	[Opal] Phillips (1823) +2 other references
ⓘ Wheal Damsel	[Opal] Phillips (1823) +1 other reference
Carn Brea Carnkie ⓘ South Wheal Basset	[Opal, Opal var: Isopyre] De Bondt (n.d.)
Gwinear-Gwithian Halancoose ⓘ Rosewarne Consols	[Opal] Golley et al. (1995)
ⓘ Rosewarne United Mines	[Opal] Phillips (1823)
ⓘ New Rosewarne Mine	[Opal] Reid et al. (1907)
Hayle Copperhouse Rosewarne and Herland United Mines (Rosewarne and Herland Mine; incl. Wheal Fancy; Wheal Pleasure) ⓘ Rosewarne Mine (incl. Bowling Green Mine; Wheal Royal)	[Opal] Hall (1868)
Great Wheal Alfred (Alfred Consols) ⓘ Wheal Alfred	[Opal] Michael W. Kieron collection
Linkinhorne Minions ⓘ Phoenix United Mine	[Opal] P D Trebilcock collection
Lostwithiel ⓘ Restormel Royal Iron Mine (Trinity Mine)	[Opal] Henwood (1843)
ⓘ Wheal Maudlin (Wheal Mawdlin; Wheal Magdalen)	[Opal] Hall (1868)
Luxulyan (Luxullian) Prideaux ⓘ Lady Rashleigh Consols	[Opal] P. D. Trebilcock
Redruth ⓘ Treskerby and Chance United Mine (incl. Treskerby Mine; Wheal Chance)	[Opal] Phillips (1823)
Wheal Buller and Beauchamp ⓘ Wheal Buller	[Opal] Hall (1868) +1 other reference
Roche Trezaise (Tresayes) ⓘ Great Wheal Prosper China Clay Pit	[Opal] Gus Horsley collection
St Columb Major Trebudannon ⓘ Wheal Trugo	[Opal] Hogg (1825) +2 other references
St Day Busveal ⓘ Cathedral Mine	[Opal] Robin Selley and Roger Eslick (2004)
ⓘ Wheal Gorland	[Opal, Opal var: Fire Opal, Opal var: Isopyre] Hall (1868) +1 other reference
St Dennis Hendra Downs ⓘ Great Wheal Prosper China Stone Quarry	[Opal] Courtenay Smale
ⓘ Rostowrack China Clay Pit	[Opal] P Trebilcock collection
St Enoder Fraddon ⓘ Wheal Remfry China Clay Pit	[Opal]
St Ives ⓘ St Ives Consols (incl. Wellesley Mine; Wheal Mary) ?	[Opal, Opal var: Isopyre] Collins (1871)
St Just Botallack ⓘ Botallack Mine	[Opal, Opal var: Fire Opal] Hall (1868) +1 other reference
ⓘ Grylls Bunny	[Opal] Carne (1822)
Pendeen ⓘ Boscaswell Downs Mine	[Opal] Reid et al. (1907)
Geevor Mine ⓘ Coronation Lode	[Opal] Ex .C Smith collection. Geevor ...
ⓘ Wheal Carne (Wheal Maitland; Wheal London)	[Opal, Opal var: Fire Opal, Opal var: Isopyre] Carne (1822)
Trewellard ⓘ Spearn Consols (Wheal Spearn)	[Opal] Carne (1822)
St Mewan Longstone Downs ⓘ Great Longstone China Clay Pit	[Opal] P
Trewoon ⓘ Blackpool China Clay Pit	[Opal] P Trebilcock collection
St Stephen-in-Brannel Foxhole ⓘ Stenna Gwyn Mine (Stennagwyn Mine)	[Opal] Hall (1868)
Melbur ⓘ Virginia China Clay Pit	[Opal, Opal var: Opal-CT] Curtis +3 other references
ⓘ Slip China Stone Quarry	[Opal] Golley et al. (1995)
ⓘ South Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine)	[Opal] Alysson Rowan collection
Treverbyn Bugle ⓘ Goonbarrow China Clay Pit	[Opal, Opal var: Opal-CT] Curtis +3 other references
ⓘ Rock Hill China Clay Pit	[Opal]
Carludon Carclaze China Clay Pit (Baal China Clay Pit) ⓘ Carclaze Old Tin Pit	[Opal] Golley et al. (1995)
Stenalees ⓘ Gunheath China Clay Pit	[Opal, Opal var: Hydrophane] Barstow (1982) +1 other reference
Cumbria South Lakeland Kentmere ⓘ Kentmere	[Opal] Day (1999)
Derbyshire Derbyshire Dales District ⓘ Bakewell ?	[Opal] Ford et al. (1993)
Eyam ⓘ Glebe Mine ?	[Opal] Ford et al. (1993)
Devon North Devon Bishop's Tawton ⓘ Downrew Quarry	[Opal, Opal var: Common Opal] Alysson Rowan collection
South Hams Shaugh Prior ⓘ Lee Moor China Clay Pit	[Opal] Ussher (1912)
Teignbridge ⓘ Lustleigh	[Opal] Hall (1868)
West Devon Belstone ⓘ Belstone Consols (Mid-Devon Copper Mine)	[Opal] Solly (1886)
Dartmoor Forest Hexworthy ⓘ Hooten Wheals (Hexworthy Mine)	[Opal] Collection Of Bernie Millington
ⓘ Wheal Katherine	[Opal] Bernie Millington Collection
Greater London Kensington and Chelsea ⓘ Kensington	[Amber] Hall (1868)
Isle of Wight Freshwater ⓘ Norton	[Amber] Hall (1868)
ⓘ Kent	[Amber] Hall (1868)
ⓘ Norfolk	[Amber] Hall (1868)
Northern Ireland County Down Mourne Mountains ⓘ Diamond Rocks	[Opal, Opal-AN] Trevor Boyd Collection
Newcastle ⓘ Lindsay's Leap	[Opal] Greg et al. (1858)
Scotland Fife Raith ⓘ Chapel Quarry	[Opal] James Phemister and A. G. MacGregor (1942)
Highland Eilean á Chèo Isle of Skye Minginish Carbost Talisker ⓘ Talisker Bay	[Opal]
Trotternish Staffin ⓘ The Storr	[Opal]
Wales Ceredigion Ceulanymaesmawr Tal-y-bont ⓘ Esgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine)	[Opal] S. Rust collection
Upper Llanfihangell-y-Creuddyn Pontrhydygroes ⓘ Frongoch Mine	[Opal] Rust (2019)

Ukraine
Crimea Feodosia area ⓘ Karadag Reserve (Kara-Dag)	[Opal] Volodymyr Manyuk (2008)
Simferopol area Petropavlovka Village area ⓘ Petropavlovskii quarry	[Opal] A. Tischenko. Minerals of the Crimea - ...
Lviv Oblast ⓘ Klyosovskoe amber deposit	[Amber] - (n.d.)
Odessa Oblast Podilsk Raion ⓘ Maiskoe gold deposit (Mayske)	[Opal] Bobrov et al. (2006, August)
Zhytomyr Oblast Zhytomyr Raion ⓘ Khoroshiv Raion (Volodarsk-Volynskii)	[Opal] Bailey (1980) +2 other references
ⓘ Volyn Pegmatites	[Opal, Opal var: Opaline] Popov (2023)

Uruguay
Artigas Department ⓘ Los Catalanes gemological district	[Opal] Arduin-Rode et al. (2024)

USA
Alabama Cherokee County ⓘ Indian Mountain	[Opal, Opal-AN var: Hyalite] Barwood (1974)
Clay County ⓘ Millerville	[Opal, Opal-AN] Cook et al. (1982)
Colbert County Waterloo ⓘ Doan Hollow Tripoli deposit	[Opal] - (2005)
Greene County ⓘ Pleasant Ridge	[Amber] Ransom (1974)
Shelby County Alabaster ⓘ Alabaster chert pit	[Opal] Rocks & Min. (2007)
Alaska Aleutians East Borough ⓘ Four Bear; PMRGX-28 Prospect	[Opal] - (2008)
ⓘ Fox Islands	[Amber] Kunz (1890)
ⓘ Unnamed Occurrence (ARDF - SB010; northwest of Ramsey Bay)	[Opal] - (2008)
Fairbanks North Star Borough Chena River Tors Campground Trail ⓘ Chena Hot Springs (yugawaralite locality)	[Opal] Eberlein et al. (1971)
Matanuska-Susitna Borough ⓘ Matanuska Valley	[Amber] Dempsky (2010, March)
Nome Census Area Kougarok Mining District ⓘ Andesite Creek; Lava Lake Occurrence	[Opal] - (2008)
Northwest Arctic Borough Fairhaven Mining District Chicago Creek ⓘ Chicago Creek Coal Mine	[Amber] Rocks & Min.: 20:481.
Southeast Fairbanks Census Area Delta River Mining District ⓘ Unnamed Occurrence (ARDF - MH109; east of lower Eureka Glacier)	[Opal] - (2008)
Valdez Creek Mining District ⓘ Unnamed Occurrence (ARDF - MH095; north of upper East Fork Maclaren River)	[Opal] - (2008)
Valdez-Cordova Census Area Chistochina Mining District ⓘ Snipe Prospect	[Opal] - (2008)
ⓘ Unnamed Occurrence (ARDF - MH197; north flank of Paxson Mountain)	[Opal] - (2008)
Arizona Apache County Cane Valley Mining District Yazzie Mesa Monument No. 2 channel ⓘ Cato Sells Mine (Cato Sells Monument Mine; Cato Sells tract 1 and 2)	[Opal] Reinhardt (1951) +1 other reference
ⓘ Monument No. 2 Mine	[Opal, Opal-AN] Witkind (1963)
Concho Concho Creek ⓘ Concho Creek deposit	[Opal] Peirce (1969) +2 other references
Cochise County ⓘ Bisbee	[Opal, Opal-AN] Luetcke (n.d.)
Carr Canyon ⓘ Reef Mine	[Opal, Opal-AN] Eckhard D. Stuart - collection
Chiricahua Mountains California Mining District (Chiricahua Mining District) ⓘ Flys Peak (Fly Peak)	[Opal] Mary Luetcke
Portal ⓘ King Ainsworth Mine group (Oregon Mine group)	[Opal] Luetcke (n.d.)
Cochise Mining District Black Rock group ⓘ Tungsten King Mine	[Opal, Opal-AN] Luetcke (n.d.)
Centurion ⓘ Centurion Mine	[Opal, Opal-AN] Luetcke (n.d.)
Dragoon ⓘ Unnamed W-Cu prospect	[Opal] Luetcke (n.d.)
Curtiss ⓘ Curtis Diatomite deposit (Curtiss Diatomite deposit)	[Opal] MRDS database Dep. ID file #10060237 +1 other reference
Dos Cabezas Mountains Dos Cabezas Mining District (Two Heads Mining District) Dos Cabezas ⓘ Dos Cabezas project (Gold Prince Mine; Henry Clay Mine; Pat Price Mine; Bain Mine; Murphy Mine; Basin Mine)	[Opal] Luetcke (n.d.)
ⓘ La Fluorita Dulcita prospect ?	[Opal] Personally collected by bob Jackson
Middle Pass Mining District Black Diamond Peak ⓘ Festerling Mine (Elsicor Mine; Cora Mine)	[Opal] Luetcke (n.d.)
Gordon Camp ⓘ San Juan Mine (San Juan group; Gordon Mine; Mann adit; Sulphide adit; Silver adit)	[Opal] Luetcke (n.d.)
ⓘ Unnamed Cu-Ag prospect	[Opal] Luetcke (n.d.)
Post Ranch ⓘ Post Ranch deposit	[Opal] MRDS database Dep. ID file #10060238
ⓘ Rustler Park	[Opal] Luetcke (n.d.)
ⓘ Saint David area	[Opal] Luetcke (n.d.)
ⓘ Opal occurrence [1]	[Opal] Luetcke (n.d.)
Tombstone Mining District Contention-Grand Central Mine group ⓘ Contention Mine	[Opal, Opal-AN] Dana 6:1093.
ⓘ Grand Central Mine	[Opal, Opal-AN] Rocks & Min.:57:12. +2 other references
ⓘ Empire Mine	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Gallagher Vanadium & Rare Minerals Corp Mine	[Opal] Luetcke (n.d.)
ⓘ Joe & Grand Central shafts area dump	[Opal] Williams (1981) +1 other reference
ⓘ Joe Mine	[Opal] Anthony et al. (1995)
ⓘ Lucky Cuss Mine	[Opal] Butler et al. (1938b) +2 other references
ⓘ Montezuma Mine	[Opal] Luetcke (n.d.)
Turquoise Mining District (Courtland-Gleeson Mining District) Courtland Casey Hill ⓘ Last Chance Mine	[Opal] Luetcke (n.d.)
ⓘ Maid of Sunshine Mine	[Opal] Luetcke (n.d.)
Yellowstone Mining District ⓘ American Mine (American shaft; War Eagle Mine; La Vantia Mine; La Ventia Mine)	[Opal] Luetcke (n.d.)
Coconino County Cameron Mining District ⓘ Cameron	[Opal] Bollin et al. (1958)
Montezuma group of claims ⓘ Montezuma No. 2	[Opal, Opal-AN var: Hyalite] Scarborough (1981)
ⓘ Montezuma Nos. 7A-7B-7C	[Opal, Opal-AN var: Hyalite] Scarborough (1981)
San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts) ⓘ Sunset Crater (Sunset Peak)	[Opal] Hanson et al. (2008)
Williams ⓘ Perrin Ranch	[Opal] Tauber (2015)
Gila County Globe Hills Mining District Buffalo Gulch ⓘ Darius Mine	[Opal] MRDS database Dep. ID #10109030
Miami-Inspiration Mining District Inspiration Miami-Inspiration deposit ⓘ Inspiration Mine	[Opal] Sun (1963) +1 other reference
ⓘ Northwestern portion of Gila County	[Opal, Opal-AN] Granger (1969) +1 other reference
San Carlos Skeleton Wash ⓘ Skeleton Wash deposit	[Opal] Bromfield (1956)
Sierra Ancha Mountains Sierra Ancha Mining District Asbestos Point (Asbestos Peak) area Warm Spring Canyon ⓘ Red Bluff Mine (Red Bluff prospect; Red Bluff claims; Claim MS 4788)	[Opal, Opal-AN] Granger (1959) +1 other reference
Aztec Lodge area Workman Creek area ⓘ Suckerite claims (Charles Jr. No. 1 & 2; Definitely group; Tulsa Minerals Inc. property; Uranium Corp. lease)	[Opal, Opal-AN] Granger (1959)
ⓘ Easy deposit	[Opal, Opal-AN] Granger (1969) +1 other reference
Rose Creek Lodge area Workman Creek ⓘ Lost Dog claim (Lost Dog deposit; Lost Dog prospect; Lorian Mine; Melinda Mine; Via Development Co. property)	[Opal, Opal-AN] Granger (1959)
Workman Creek Valley Rose Creek Lodge area ⓘ Hope Mine (Hope deposit)	[Opal, Opal-AN] Granger (1959)
Graham County ⓘ Deer Creek Fire Agate Mine	[Opal, Opal var: Opal-C] Natkaniec-Nowak et al. (2020)
Lone Star Mining District (Safford Mining District; Dos Pobres Mining District) Gila Valley Fort Thomas ⓘ Unnamed diatomite deposit	[Opal] MRDS database Dep. ID #10060232.
Solomon Pass ⓘ Solomon deposit (Solomonville Diatomite; Solomonville deposits)	[Opal] MRDS database Dep. ID #10060233. +1 other reference
Peridot area [Gila County] ⓘ San Carlos deposits	[Opal] MRDS database Dep. ID #10060241
San Carlos ⓘ Skeleton Wash	[Opal] MRDS database Dep. ID #10095952
ⓘ Triplets Wash	[Opal] MRDS database Dep. ID #10060231
Whitlock Mountains Dry Mountain ⓘ Flat Tire group (Flat Tire diatomite deposit)	[Opal] MRDS database Dep. ID #10062190
ⓘ White Bluffs Uranium prospect	[Opal] MRDS database Dep. ID #10209800
Slick Rock Wash ⓘ Whitlock Mines Inc. prospect (Whitlock deposit)	[Opal] MRDS database Dep. ID #10210079.
Greenlee County ⓘ Copper Mountain Mining District (Clifton-Morenci Mining District)	[Opal] Reber et al. (1916) +1 other reference
Duncan ⓘ State Route 75 opal locality	[Opal] Cristofono (n.d.)
Morenci ⓘ Morenci Mine	[Opal] Moolick et al. (1966) +1 other reference
Steeple Rock Mining District (Duncan Mining District) ⓘ Duncan area Diatomite deposits	[Opal] MRDS database Dep. ID #10060236 MRDS ID ...
ⓘ Diatomite prospect	[Opal] MRDS database Dep. ID file #10161567.
La Paz County Buckskin Mountains ⓘ Cummingtonite deposit	[Opal, Opal-AN] The-Vug.com Collecting Minerals of La ...
ⓘ Heson Mine (Hesson Mine)	[Opal, Opal-AN] Cristofono (n.d.)
Santa Maria Mining District (Planet Mining District; Swansea Mining District; Bill Williams Mining District) ⓘ BCC Mines	[Opal, Opal-AN] The-Vug.com Collecting Minerals of La ...
Silver Mining District ⓘ Red Cloud Mine	[Opal, Opal-AN] Dana 6: 1094.
Maricopa County ⓘ Lake Pleasant Mine	[Opal] MRDS file #10060235.
ⓘ Morristown	[Opal, Opal var: Precious Opal] Galbraith (1959)
Osborn Mining District Hummingbird Springs ⓘ Moon Anchor Mine	[Opal, Opal-AN] Luetcke (n.d.)
Tonopah Tiger Wash ⓘ Evening Star Mine	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Queen of Sheba Mine (La Aguila patented claim; La Firmos Mine)	[Opal, Opal-AN] Luetcke (n.d.)
Saddle Mountain ⓘ North slope	[Opal] Galbaith (1959) +1 other reference
Vulture Mining District ⓘ Vulture	[Opal, Opal-AN] Luetcke (n.d.)
Mohave County Aquarius Cliffs ⓘ Catherine and Michael claims	[Opal] Granger et al. (1962)
Artillery Mountains Cleopatra Mining District Kimble Mining Sub-District Maggie Canyon Maggie Canyon zeolite and Mn deposit ⓘ Maggie Mine	[Opal] Mouat (1962)
ⓘ Black Mountains	[Opal, Opal-AN] Galbraith (1959)
Oatman Mining District Union Pass Mining District (Katherine Mining District) ⓘ Union Pass	[Opal, Opal var: Fire Opal] Galbraith (1959)
Lost Basin Mining District ⓘ Unnamed Au-Cu-Pb-Mo prospect [1] (USGS PP 1361 locality 482)	[Opal] Theodore et al. (1987)
Navajo County Black Mesa ⓘ Black Mesa Coal Mine	[Opal] Tauber (2015)
Pima County ⓘ Ajo Mining District	[Opal] Sun (1961) +1 other reference
Little Ajo Mountains Ajo ⓘ New Cornelia Mine	[Opal] Gilluly (1946) +1 other reference
Helvetia-Rosemont Mining District ⓘ Andrada Marble Quarry	[Opal] MRDS database Dep. ID file #10060227
Helvetia Monument Mountain ⓘ Omega Mine	[Opal] Luetcke (n.d.)
Tiptop Mountain Tiptop Mine group (Tiptop Camp prospects/mines) ⓘ Bulldozer Hill	[Opal, Opal-AN] P Cristofono collection
Sierrita Mountains Pima Mining District San Xavier ⓘ Mission complex	[Opal, Opal-AN]
Stevens Mountain ⓘ Copper Glance Mine (Glance Mine)	[Opal] Anthony et al. (1995)
Silver Bell Mountains Silver Bell Mining District Mineral Mountain ⓘ Silver Bell Mine	[Opal] Kerr (1951) +2 other references
Tucson Mountains Amole Mining District Tucson Mountain District Saguaro National Park ⓘ Old Yuma Mine	[Opal, Opal-AN] Luetcke (n.d.)
Pinal County Bunker Hill Mining District (Copper Creek Mining District) Copper Creek (Copper Creek Canyon) ⓘ Copper Creek Road	[Opal, Opal-AN] Martin (2023)
Dudleyville area PZ Ranch area ⓘ Feldman and Winkelman Gypsum pits (Feldman Quarry; National Gypsum Co. Mine)	[Opal] MRDS database Dep. ID #10060185
Mammoth area ⓘ M. Hererras property (Arizite Products Corp. Mine)	[Opal] Wilson (1949)
Mammoth Mining District Mammoth area ⓘ San Pedro River	[Opal] Bollaert
Tiger St. Anthony deposit ⓘ Mammoth-Saint Anthony Mine	[Opal, Opal-AN var: Hyalite] Frank Karasti
Mineral Mountain Mining District Reymert Canyon ⓘ Reymert Mine	[Opal, Opal-AN] Collected by C. Lemanski
Riverside Mining District Gila River ⓘ Cochran area	[Opal] Galbraith (1959)
San Pedro Mining District San Pedro River-Alder Wash confluence area San Pedro River ⓘ Eagle prospect	[Opal] MRDS database Dep. ID #10186713
Scott Mountain ⓘ Ray Mine	[Opal, Opal-AN] Rolf Luetcke
Superior ⓘ Picketpost Mountain	[Opal] Univ. AZ Bull. 41 (1916-17) +1 other reference
Whitlock Wash area ⓘ White Cliffs Mine	[Opal] MRDS database Dep. ID #10060239
Santa Cruz County ⓘ Jay R claim	[Opal, Opal var: Precious Opal] Anthony et al. (1995)
Oro Blanco Mountains Oro Blanco Mining District (Ruby Mining District) ⓘ Arizona Blue Fire Opal claim (Scorpio claims)	[Opal, Opal var: Precious Opal] Anthony et al. (1995)
Redrock Mining District ⓘ Eagle deposit	[Opal] Phillips (1987)
Huachuca Mountains Northwestern foothills ⓘ Lyle Creek Diatomite deposits (Huachuca deposits)	[Opal] Peirce (1969)
Redrock Canyon East of Red Rock Canyon ⓘ Precious Opal occurrence	[Opal, Opal var: Precious Opal] Lewis (1942) +1 other reference
Santa Cruz village area ⓘ Grosvenor Hills	[Opal, Opal-AN] Galbraith (1959)
Tyndall Mining District Salero area Grosvenor Hills ⓘ Southwest of Salero	[Opal, Opal-AN] Schrader (1915)
Yavapai County Bradshaw Mountains (Bradshaw Range) Agua Fria Mining District Mayer ⓘ Copper Queen Mine	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Agua Fria River (stream)	[Opal] Galbraith (1959) +2 other references
Castle Creek Mining District ⓘ Castle Hot Springs	[Opal, Opal var: Precious Opal] Galbraith (1959)
Copperopolis ⓘ Unnamed Cu prospect	[Opal] Luetcke (n.d.)
ⓘ Great Cross Cut prospect (Pearl adit; Johnston group; Glory Hole; Thompson Mine)	[Opal, Opal-AN] Dale (1961)
Pine Grove Mining District Crown King Lane Mountain ⓘ Fat Jack Mine	[Opal] Scovil et al. (1991)
Camp Verde Mining District Camp Verde ⓘ Verde River deposit	[Opal] MRDS database Dep. ID #10060244
Eureka Mining District Bagdad ⓘ Bagdad Mine	[Opal] Galbraith (1959)
Mayer Agua Fria River ⓘ Burmeister Mine (Bunker & Burmeister claims; Bunker claim; Black Magic Mine; Victory Manganese Mine)	[Opal] Hewett et al. (1960) +1 other reference
ⓘ Moore Wash area	[Opal] Galbraith (1959) +1 other reference
Yuma County Kofa Mining District ⓘ King of Arizona Mine	[Opal, Opal-AN] Former Don Miller collection
Muggins Mountains Muggins Mining District ⓘ Muggins Mountains uranium prospects	[Opal] US Atomic Energy Commission Prelim. ... +1 other reference
ⓘ Red Knob Mine (Red Knob prospect; Red Knob claims)	[Opal] Outerbridge et al. (1960) +1 other reference
Arkansas ⓘ Benton County	[Opal] Arkansas Geological Survey
ⓘ Dallas County	[Opal] Howard (2007)
Garland County Hot Springs North Mountain ⓘ Sutton Quarries	[Opal] Rocks & Min.: 21:424.
ⓘ Whittington Quarry	[Opal] Rocks & Min.: 21:424.
Indian Mountain ⓘ Smith Whetstone Quarry	[Opal] Smith (1988)
Lake Catherine ⓘ V intrusive	[Opal] Smith (1988)
ⓘ Malvern Minerals Company Mine	[Opal] www.lgsweb.org (2002)
ⓘ Wilson Springs (Potash Sulfur Springs)	[Opal] www.handbookofmineralogy.org (2012)
Union Carbide Mine ⓘ North Wilson pit	[Opal, Opal var: Precious Opal] Howard +1 other reference
ⓘ Hot Spring County	[Amber] Mason (1976)
ⓘ Magnet Cove	[Opal] Shockley (1976)
ⓘ Diamond Jo Quarry	[Opal] Henry Barwood - unpublished (2010)
Perla ⓘ Malvern clay pits	[Amber] Rocks & Min.: 63:110.
ⓘ Howard County	[Opal] Arkansas Geological Survey
ⓘ Southwest Arkansas Mercury Mining District	[Opal] - (2005)
ⓘ Lonoke County	[Opal] Howard (1987) +1 other reference
ⓘ Mercury District of Southwest Arkansas	[Opal] - (2005)
ⓘ Montgomery County	[Opal] Howard (1987) +1 other reference
Pike County ⓘ Mercury District of Southwest Arkansas	[Opal] - (2005)
Murfreesboro ⓘ Crater of Diamonds State Park (Prairie Creek Lamproite)	[Opal, Opal-AN] P Cristofono collection
Polk County Shady ⓘ Coon Creek Mine	[Opal] Rocks & Min.:63:118.
ⓘ Sam Avants prospects	[Opal] Smith (1988)
Pulaski County Little Rock ⓘ Granite Mountain area	[Opal] Smith (1988) +1 other reference
ⓘ Big Rock Quarry (3M Quarry; Arch Street Pike Quarry)	[Opal] Henry Barwood - unpublished (2010)
ⓘ Saline County	[Opal] Arkansas Geological Survey
Sevier County Gillham ⓘ Antimony Bluff Mine	[Opal] Rocks & Min.:63:123 +1 other reference
ⓘ Union County	[Opal, Opal-AN] Arkansas Geological Survey
Washington County ⓘ Farmington	[Opal] Ransom (1974)
California Alpine County ⓘ Monitor - Mogul Mining District	[Opal] Prenn et al. (1991)
Leviathan Peak ⓘ Leviathan Mine	[Opal] Pabst (1940)
Amador County Fiddletown Mining District (Oleta Mining District) River Pines ⓘ Chrysoprase and Moss Opal deposits	[Opal, Opal var: Moss Opal] - (2005)
Pardee Mining District Sunnybrook ⓘ Custer prospect (Dooley prospect; Custer Dooley prospect)	[Opal] - (2005)
Volcano Mining District ⓘ Volcano	[Opal] January +2 other references
ⓘ Diamond placer occurrence MRDS No. 10028324	[Opal] - (2005)
Calaveras County Camanche Mining District Wallace ⓘ Wallace Mine	[Opal] - (2005)
Carson Hill Mining District (Melones Mining District) Melones Carson Hill Gold Mining Company Mines (Carson Hill Mines) ⓘ Stanislaus Mine	[Opal] Dana 7:I:206 +1 other reference
East Belt Mokelumne Hill Mining District Mokelumne Hill Chili Gulch (Chile Gulch ?) ⓘ Chili Gulch occurrences	[Opal] Browne (1869) +2 other references
ⓘ Green Mountain Mine (Calaveras Crystal mine)	[Opal] Clark et al. (1963)
ⓘ Rough Diamond Mine (Rough Diamond Placer Mine; Rough Diamond Crystal Mine)	[Opal] Clark et al. (1963)
ⓘ Hexter Placer Mine	[Opal] - (2005)
French Creek Mining District Mountain Top ⓘ Dean Mine	[Opal] - (2005)
Pardee Mining District Camp Pardee ⓘ Gillam Mine	[Opal] - (2005)
Toyon ⓘ Hooten Ranch deposit	[Opal] - (2005)
Colusa County Coast Ranges Sugarloaf ⓘ Burgett prospect	[Opal] - (2005)
Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District) Wilbur Springs Cherry Hill deposit ⓘ Wide Awake Mine	[Opal] - (2005)
ⓘ Elgin Mine	[Opal, Opal var: Opal-C] White (1967) +2 other references
ⓘ Elgin Mine area	[Opal, Opal var: Opal-C] White (1967) +2 other references
ⓘ Petray Mine	[Opal] Slowey et al. (2008)
Contra Costa County Bayview-Montalvin ⓘ Pinole prospect (Pinole Dohrman; Pawsey; Dohrman Pawsey)	[Opal] Davis (1951) +1 other reference
El Dorado County East Segment Mother Lode Georgetown District Meadow Brook ⓘ Stifle claims (Stifle prospects; Stifle Memorial claim; Traverse Cr. Special Interest Area; Traverse Creek Special Interest Area)	[Opal] Pisciotta (2019)
Salmon Falls Mining District (Flagstaff Hill area) Flagstaff Hill Pilliken Mine (Pillikin Mine; Pillikan Mine; Pilliken Chrome Mine) ⓘ Pillikin Mine area 3 (West Basin)	[Opal] - (2005)
ⓘ Steele Mine (Steel deposit)	[Opal] - (2005)
ⓘ Fresno County	[Opal] Murdoch (1966)
Big Creek-Rush Creek Mining District ⓘ Big Creek	[Opal] Walstrom et al. (2005)
ⓘ Esquire No. 7 claim	[Opal] Walstrom (n.d.)
ⓘ Esquire No. 8 claim	[Opal, Opal-AN var: Hyalite] Walstrom (n.d.)
ⓘ Rush Creek	[Opal] Alfors et al. (1965) +2 other references
ⓘ Cole Spring Outcrops	[Opal] Walstrom (n.d.)
ⓘ Esquire No. 1 claim	[Opal] Walstrom (n.d.)
ⓘ Forbes Property	[Opal] Walstrom (n.d.)
ⓘ Snow Cap Mine	[Opal] Walstrom (n.d.)
Fresno Mountains East of Fresno ⓘ Unnamed Opal occurrence	[Opal, Opal var: Moss Opal] Murdoch (1966)
Little Panoche Detention Dam ⓘ Unnamed Diatomite occurrence [1]	[Opal] - (2005)
Tumey Hills ⓘ Silver Moon claims 1; 2 and 3	[Opal] - (2005)
Glenn County Red Mountain Black Diamond group ⓘ Black Diamond Mine	[Opal] - (2005)
Imperial County Chocolate Mountains Paymaster Mining District ⓘ Midway Well	[Opal, Opal var: Opal-Agate] Perry
ⓘ Inyo County	[Opal] Murdoch (1966)
Coso Hot Springs Coso Hot Springs deposit ⓘ Coso Mine (Devil's Kitchen; Atlas; Lynch & Lynch; Nicol; Walley-Mickey & Wheeler)	[Opal, Opal-AN] Collection of RJ Martin
ⓘ Wheeler Area Mine (Coso Mine)	[Opal] - (2005)
ⓘ Coso Mining District	[Opal] Pemberton (1983) +1 other reference
Darwin Hills Darwin Mining District Darwin ⓘ Custer Mine	[Opal, Opal-AN] Pemberton (1983) +1 other reference
Dublin Hills Shoshone ⓘ Ash Meadows Zeolite deposit	[Opal] - (2005)
ⓘ Green Velvet claims (Green Velvet claim; Green Velvet group)	[Opal] Troxel et al. (1957) +2 other references
ⓘ Lake Tecopa Basin	[Opal, Opal var: Precious Opal] Rod Martin Collection
ⓘ Lake Tecopa Zeolite deposit	[Opal] - (2005)
Lookout Mountain ⓘ Pickup Mine (Chipmunk Mine)	[Opal, Opal-AN] Former Howard Merk collection +1 other reference
Saline Valley Badwater Springs ⓘ Unnamed Diatomite occurrence [1]	[Opal] - (2005)
Sugarloaf Mountain ⓘ Obsidian Ridge (Little Lake Perlite deposits; Desert Materials Corp. deposit)	[Opal] Rogers (1922) +1 other reference
ⓘ Unnamed lava flow [1]	[Opal] Pemberton (1983)
Kern County Blackwells Corner ⓘ Unnamed Diatomite occurrence [1]	[Opal] - (2005)
Boron ⓘ Kramer Borate deposit	[Opal] U.S. Borax
West Baker ⓘ Vanuray prospect	[Opal] Walker et al. (1956) +2 other references
California City ⓘ Moss Opal occurrence	[Opal, Opal var: Moss Opal] Stoddard (1923) +1 other reference
El Paso Mountains District Last Chance Canyon Silica Gem claims ⓘ Barnett Opal Mine	[Opal, Fire Opal var: Precious Fire Opal, Opal var: Fire Opal, Opal var: Precious Opal] Christopher N. Wentzell
ⓘ Nowak Mine (Last Chance Opal Mine; Nowak Fire Opal Mine; Cowden Mine)	[Opal, Opal var: Fire Opal, Opal var: Precious Opal] Christopher Wentzell
ⓘ Unspecified Opal occurrence [1]	[Opal, Opal var: Fire Opal] MacFall (1951)
Ricardo ⓘ Petrified Forest	[Opal] Dibblee et al. (1952) +4 other references
ⓘ Red Rock Canyon prospects	[Opal] Murdoch et al. (1942) +4 other references
Mojave-Rosamond Mining District (Mojave Mining District) Rosamond ⓘ Unnamed Opal occurrence [1]	[Opal, Opal var: Milk Opal, Opal var: Resin Opal] Lewis (1933) +1 other reference
Rademacher Mining District ⓘ Unnamed Opal-Chalcedony occurrence [1]	[Opal] Kunz (1900) +1 other reference
Randsburg ⓘ Mabel S claim	[Opal] - (2005)
Shale Hills ⓘ Unnamed Diatomite deposit [1]	[Opal] Braitwaite
ⓘ Lake County	[Opal] Murdoch (1966)
ⓘ East Mayacmas Mining District	[Opal] White (1967) +2 other references
Castle Rock Springs ⓘ Helen Mine (Helen Mine group; Dead Broke Mine; American Mine)	[Opal] - (2005)
Middletown Great Western-Mirabel group ⓘ Great Western Mine (Laguna Western; Black Bart Mine; Tucker lease)	[Opal] - (2005)
ⓘ Pioneer Mine	[Opal, Opal-AN] Dana 6: 1096.
Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District) Clear Lake Oaks ⓘ Sulphur Bank Mine (Sulfur Bank Mine; Sulphur Bank deposits)	[Opal] - (1947) +7 other references
Lower Lake ⓘ Baker Mine	[Opal] USBM IC8252
Wilbur Springs area ⓘ Abbott Mine (Abbott Quicksilver Mine)	[Opal] Bailey (1959) +2 other references
ⓘ Lassen County	[Opal] Murdoch (1966)
Red Rock ⓘ Long Valley Quarries (Lassenite Industries)	[Opal] California Division of Mines and Geology (1981) +1 other reference
ⓘ Susanville	[Opal] Butler (1995)
Westwood ⓘ Unnamed Diatomite occurrence [1]	[Opal] - (2005)
Los Angeles County Acton Mining District Acton Antelope Valley ⓘ Collecting Site Mine	[Opal] Oakeshott (1958)
Agoura Hills ⓘ Archstone	[Opal] MarekC field collection 2014
ⓘ Canwood St construction site 2014	[Opal] M.Chorazewicz collection
Charter Oak ⓘ Featherstone deposit (Feather-Stone Insulation Company)	[Opal] Sampson (1937) +1 other reference
Kagel Canyon ⓘ Katz Diatomaceous Shale prospect	[Opal] Gay et al. (1954)
Lang ⓘ Tick Canyon	[Opal] mineralsocal.org
Lomita ⓘ Diatomite deposit	[Opal] Merrill (1916) +2 other references
Los Angeles Hollywood Hills Hollywood Cahuenga Pass Cahuenga Boulevard roadcut ⓘ Neuerberg locality 9	[Opal] Neuerberg (1951)
Malibu Point Dume ⓘ Point Dume deposit	[Opal] Gay et al. (1954)
Palmdale Hunt Canyon ⓘ Unnamed Zeolite occurrence	[Opal] Van Nostrand Reinholt Press: 353-354 +2 other references
Palos Verdes Peninsula ⓘ Palos Verdes beach cliffs	[Opal] cameron holden's collection
Rolling Hills ⓘ Unnamed Diatomaceous Earth quarry	[Opal] California Division of Mines and Geology (11) +1 other reference
Rolling Hill Estates ⓘ Dicalite Mine (Walteria; Palos Verde Ranch; Dicalite Company)	[Opal] California Journal of Mines and Geology (1937) +1 other reference
Santa Catalina Island ⓘ Buffalo Springs Weather Station vicinity	[Opal] Bailey (1941) +2 other references
ⓘ Santa Cruz offshore basin	[Opal] Fleischer (1972) +2 other references
Madera County Indian Springs ⓘ Unnamed Diatomite occurrence (1)	[Opal] - (2005)
ⓘ Marin County	[Opal, Opal-AN] Pelletier
Mendocino County Cloverdale area Russian River ⓘ Rosenhahnite occurrence	[Opal] Pabst et al. (1967) +3 other references
ⓘ Merced County	[Opal] Murdoch (1966)
California Aquaduct Dos Amigos Pumping Station ⓘ Agricultural Minerals & Fertilizer Company	[Opal] - (2005)
ⓘ Unnamed Diatomite deposits (1)	[Opal] - (2005)
ⓘ Mono County	[Opal] Murdoch (1966)
Benton Range Chidago Mining District Banner Ridge ⓘ Morris Ameil group	[Opal] calif Div Mines SR48 "Economic Geology ...
ⓘ Morris claims (Morris Ameil group; Amiel group; Ameil et al claims)	[Opal, Opal-AN] Lemmon (1941b) +3 other references
Bodie Hills Bridgeport Mining District Bridgeport ⓘ Laughlin prospect (Loughlin prospect)	[Opal] Holmes (1965) +1 other reference
Potato Peak ⓘ Alto prospect	[Opal] Holmes (1965) +2 other references
Willow Springs ⓘ Calmono Mine (Old Timer Mine)	[Opal] Holmes et al. (1965) +2 other references
Masonic Mining District New York Hill ⓘ Serita Mine	[Opal, Opal-AN] Field collected by Daniel Evanich
Monterey County King City ⓘ King City deposit	[Opal] Hart (1966)
Parkfield ⓘ Patriquin Mine (Cholame-Parkfield Mine; Paloma Mining Company; Franciscan Mine; Pitts Mine)	[Opal] - (2005)
Santa Lucia Mts (Santa Lucia Range) Bradley ⓘ California Kieselguhr Company Mine	[Opal] Hart (1966) +1 other reference
ⓘ Great Lakes Carbon Corp. prospect	[Opal] Hart (1966) +1 other reference
ⓘ Jens deposit (1)	[Opal] Hart (1966)
ⓘ Riewerts deposit	[Opal] Hart (1966) +1 other reference
Bryson ⓘ Oakdale Ranch	[Opal] Hart (1966) +1 other reference
ⓘ Unnamed Diatomite occurrence [1]	[Opal] California Geology (1981) +1 other reference
Del Rey Oaks ⓘ Work Ranch deposit	[Opal] Hart (1966)
ⓘ Napa County	[Opal, Opal var: Opaline] Clark (1993)
Calistoga ⓘ Kellett Mine	[Opal] - (2005)
Twin Peaks ⓘ Corona Mines (Vallejo Mines)	[Opal] - (2005)
Calistoga Hot Springs ⓘ Cavagnaro prospect	[Opal] USGS MRDS database (2005)
ⓘ Plymouth Mine	[Opal] - (2005)
Knoxville area ⓘ Adams and Westendorf claims	[Opal] USGS MRDS database (2005)
Knoxville Mining District ⓘ Knoxville	[Opal, Opal var: Prase Opal] Rocks&Min 11 (8)
ⓘ McLaughlin Mine (Manhattan Mine)	[Opal, Opal var: Lemon Opal, Opal var: Opal-CT, Opal var: Opaline, Opal var: Precious Opal, Opal-A var: Opal-AG] Sherlock et al. (1995) +1 other reference
ⓘ Redington Mine (Boston Mine; Knoxville Mine; Excellsior Mine)	[Opal] Rogers (1931) +2 other references
Oakville Mining District Oakville ⓘ Diatomite occurrence (1)	[Opal] California Geology (1981) +1 other reference
Vichy Springs ⓘ Basalt Rock Company Mine	[Opal] Weaver (1949)
Nevada County Grass Valley Mining District Grass Valley ⓘ Hudson Bay Quartz Mine (Hudson Bay Qtz; Hudson Bay; Blue Ridge vein)	[Opal] - (2005)
ⓘ Orange County	[Opal] Murdoch (1966)
Laguna Woods ⓘ Aliso prospect	[Opal] California Preliminary Report: 15: Pls. ...
ⓘ Placer County	[Opal] Murdoch (1966)
Plumas County Clio ⓘ Laura Quartz Mine	[Opal] Rocks & Min.: 17:412.
Riverside County Jurupa Valley Crestmore Crestmore quarries Sky Blue Hill ⓘ Commercial Quarry	[Opal, Opal-AN] Woodford et al. (1941) +3 other references
Jurupa Mountains ⓘ Jensen Quarry	[Opal] DeVito et al. (1984)
Mule Mountains District (Hodges Mountain District) ⓘ Opal Hill Mine	[Opal]
San Benito County Goat Mountain ⓘ Clear Creek claim	[Opal] Erd et al. (1993) +1 other reference
Panoche ⓘ Reported Diatomite deposit [1]	[Opal] Anderson et al. (1915) +1 other reference
Sampson Peak ⓘ North Star Mine	[Opal] - (2005)
San Bernardino County Afton ⓘ Afton Canyon	[Opal]
ⓘ Mojave River Road	[Opal]
Black Mountain [2] ⓘ Unnamed Opal occurrence [1]	[Opal] Kunz (1903) +3 other references
Bloomington ⓘ Henshaw Quarry	[Opal] Cooney (1956) +2 other references
Bristol Mountains Amboy area ⓘ New Method Mine	[Opal, Opal-AN] Luetcke (n.d.)
Bullion Mts (Bullion Range) Stedman District (Ludlow; Rochester; Buckeye) Stedman ⓘ Bagdad-Chase Mine (Barstow mill; Camp Rochester; Pacific Mine; Pacific Mines; Roosevelt Consolidated Mine; Buckeye-Stedman-Bagdad Chase Mine)	[Opal, Opal-AN var: Hyalite] Robert E.Walstrom Collection
Calico Mts (Calico Hills) ⓘ Calico District (Daggett District; Calico-Daggett area)	[Opal] Mayo (1972)
East Kramer Mining District East Kramer Borate area (East Kramer Colemanite area) ⓘ Saddleback Mountain	[Opal] MarekC (2018) +1 other reference
ⓘ Goffs	[Opal]
Lucerne Valley Limestone District Lucerne Valley ⓘ White Knob Quarry	[Opal, Opal-AN var: Hyalite] Howard H. J. (2011)
Newberry Mountains Newberry Springs ⓘ Black Raven prospect (Lankin; Newberry)	[Opal] - (2005)
ⓘ Opal Mountain	[Opal] Christopher N. Wentzell
ⓘ Opal Mountains Agate Field prospect (Black Mountain; Black Mtn)	[Opal, Opal var: Cherry Opal] Beste (2005)
ⓘ Unnamed Opal-Perlite prospects [1]	[Opal] - (2005)
Robbers Mountain ⓘ Unnamed Agate-Quartz occurrence [2]	[Opal] Perry +1 other reference
ⓘ Searles Lake	[Opal] Tschernich (1992)
Silver Lake Mining District Soda Mountains Baker Otto Mountain ⓘ Aga Mine	[Opal, Opal-AN] Eckhard D. Stuart - collection
Zzyzx ⓘ Blue Bell Mine	[Opal, Opal-AN] Thorne (n.d.)
ⓘ C-Site	[Opal, Opal-AN] Collected by and in the collection of ...
San Diego County Aguanga Mountain Mining District (Smith Mountain Mining District) Oak Grove Aguanga Mountain ⓘ Maple Lode Mine (Maple claim)	[Opal, Opal-AN] Cordova
Pala Mining District Pala ⓘ Tourmaline Queen Mountain (Pala Mtn; Queen Mtn)	[Opal] Jahns et al. (1951)
Rincon Mining District Rincon Rincon Mountain ⓘ Victor Mine (Big Buck mine; Big Buck prospect)	[Opal, Opal-AN] Rogers
San Francisco County ⓘ San Francisco	[Opal] Schlocker (1974)
ⓘ San Luis Obispo County	[Opal] Murdoch (1966)
Los Osos ⓘ Ferrell deposit	[Opal] Laizure (1925) +2 other references
ⓘ Incello Company property (Thompson Reid Estate; U.S. Refractories Company)	[Opal] Laizure (1925) +1 other reference
ⓘ San Luis Range Diatomite Mine	[Opal] Minobras (1973) +1 other reference
ⓘ Nipomo	[Opal] Lapidary Journal
Pismo Beach ⓘ Pismo Heights Company property	[Opal] Laizure (1925) +1 other reference
San Luis Obispo ⓘ Unnamed diatomite deposit [1]	[Opal] Laizure (1925) +1 other reference
Santa Lucia Mts (Santa Lucia Range) Arroyo Grande ⓘ Unnamed diatomite deposit [2]	[Opal] Laizure (1925) +1 other reference
Cambria-Oceanic Mining District Cambria ⓘ Oceanic Mine	[Opal] - (1979)
Chorro ⓘ Estrella Mine	[Opal] - (2005)
Shell Beach ⓘ Los Penascos Ranch deposit (Los Pemascos Ranch deposit)	[Opal] Franke (1935a) +1 other reference
ⓘ San Mateo County	[Opal] Murdoch (1966)
Palo Alto area ⓘ Unnamed Hg occurrence [2]	[Opal] Rogers (1911) +2 other references
Santa Barbara County ⓘ Arroyo Burro Beach	[Opal] Eichhubl et al. (1998)
Buellton ⓘ Grefco Mine	[Opal] California Geology (1981) +1 other reference
ⓘ Unnamed Diatomite deposits [10]	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Hope Ranch [2]	[Opal] Kampf et al. (2024)
Las Cruces ⓘ Unnamed Diatomite deposit	[Opal] Dibblee et al. (1950) +1 other reference
Lompoc ⓘ Dibble pit	[Opal] - (2005)
ⓘ Great Lakes Carbon Corp. Mine	[Opal] Dibblee et al. (1950) +2 other references
ⓘ Johns-Manville Quarries Mine (Balaam Mine; Sunnyside Mine)	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Palos Colorados Quarry	[Opal] California Division of Mines and Geology (1990) +1 other reference
ⓘ San Miguelito Canyon Road Diatomite outcrop	[Opal] Amir Akhavan Collection
ⓘ Unnamed Diatomite deposit [13]	[Opal] Huguenin (1919) +2 other references
ⓘ Unnamed Diatomite deposit [3]	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Unnamed Diatomite deposit [4]	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Unnamed Diatomite deposits [6]	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Unnamed Diatomite deposits [7]	[Opal] California Division of Mines Bulletin 186 (1966) +1 other reference
ⓘ Unnamed Diatomite quarry [11]	[Opal] Dibblee et al. (1950) +1 other reference
Los Olivos ⓘ Unnamed Diatomite deposits [8]	[Opal] Dibblee et al. (1950) +1 other reference
Santa Maria ⓘ Unspecified Opal occurrence [1]	[Opal] Rogers (1938) +1 other reference
Santa Ynez ⓘ Unnamed Diatomite deposits [12]	[Opal] Dibblee et al. (1950)
Solvang ⓘ Unnamed Diatomite deposit [1]	[Opal] Dibblee et al. (1950) +1 other reference
Vandenberg Space Force Base ⓘ Unnamed Diatomite deposit [2]	[Opal] Dibblee et al. (1950) +1 other reference
ⓘ Unnamed Diatomite deposit [5]	[Opal] Dibblee et al. (1950) +1 other reference
Santa Clara County Black Wonder Mining District Mount Hamilton ⓘ Unnamed Zeolite occurrence [5]	[Opal] Murata et al. (1973) +2 other references
Coyote Mining District Coyote ⓘ O'Connell Mine (Greenwalls property; O'Connell Ranch Mine; O'Connell Number 1; Greenwalt)	[Opal] - (2005)
New Almaden Mining District New Almaden ⓘ Guadalupe Mine	[Opal] Rocks & Minerals (1944)
ⓘ New Almaden Mine (New Almaden Mines)	[Opal] Bradley (1918)
San Jose Oak Hill ⓘ Hillsdale Mine (Chaboya-Hillsdale Mine; San Juan Bautista Mine; San Juan Mine; San Juan Quicksilver Mine; Sheboya Mine; Chapman Mine; Oak Hill Mine)	[Opal] Crittenden et al. (1951) +3 other references
Shasta County Brush Mountain ⓘ Unnamed Diatomite occurrence [3]	[Opal] [… (abstract) +2 other references
ⓘ Burney pit	[Opal] California Division of Mines and Geology (1990) +1 other reference
Burney Spring Mountain ⓘ Unnamed Diatomite occurrence [1]	[Opal] California Division of Mines and Geology (1963) +1 other reference
Chalk Mountain ⓘ Insulator group	[Opal] Averill (1939) +1 other reference
ⓘ Dicalite Quarry	[Opal] Bradley (1940) +1 other reference
Haney Mountain ⓘ Grefco Mine	[Opal] California Geology (1981) +1 other reference
ⓘ Venture II Mine	[Opal] - (2005)
Klamath Mountains East Shasta Copper - Zinc Mining District Heroult ⓘ Pit River Consolidated Mines (Pit River Mine)	[Opal] - (2005)
ⓘ Lake Britton Quarry	[Opal] California Division of Mines and Geology (1981) +1 other reference
Lassen Volcanic National Park ⓘ Brokeoff Mountain	[Opal] Williams (1932) +3 other references
ⓘ Lassen Peak	[Opal] Robert G. Lee et al. (2005)
Lookout Mountain ⓘ Unnamed Diatomite occurrence [2]	[Opal] - (2005)
ⓘ Mount Shasta Silica Mine (Shasta Diatomite group)	[Opal] Logan (1926) +4 other references
Shingletown ⓘ Stewart & Moore prospect	[Opal] California Journal of Mines and Geology (1928) +1 other reference
Sierra County Alleghany Mining District (Forest Mining District) Alleghany ⓘ 16 to 1 Mine (Sixteen-to-One Mine; Original Sixteen-to-One Mine)	[Opal] - (2005)
Siskiyou County Copco Lake ⓘ Unnamed Diatomite deposit [1]	[Opal] California Division of Mines Bulletin ...
Dunsmuir ⓘ Unnamed Opal occurrence [1]	[Opal, Opal var: Fire Opal] MacFall (1951)
Klamath Mountains Shasta Retreat Mount Bradley ⓘ Unnamed Opal occurrence [2]	[Opal, Opal var: Fire Opal] [… (abstract) +2 other references
Lava Beds National Monument ⓘ Catacombs Cave (The Catacombs)	[Opal] Swartzlow (1937) +2 other references
ⓘ Sonoma County	[Opal] Murdoch (1966)
Coast Range Guerneville Mining District Guerneville ⓘ Great Eastern and Mount Jackson Mine	[Opal] Quicksilver resources of California: with a section on metallurgy and ore ... By Walter Wadsworth Bradley (1917) +1 other reference
Warm Springs Dam Skaggs Springs ⓘ Skaggs Springs Mine	[Opal] Everhart (1950a) +3 other references
Fetters Hot Springs ⓘ Mount Pisgah Vineyard	[Opal] Honke et al. (1950) +1 other reference
Glen Ellen Weise Ranch ⓘ Weise Clay pit	[Opal, Opal var: Fire Opal] Bradley (1916a) +1 other reference
Sonoma Mountains El Verano ⓘ Felder Mine	[Opal] Honke et al. (1950) +1 other reference
Glen Ellen ⓘ Richter deposit	[Opal] Honke et al. (1950)
West Mayacmas Mining District Castle Rock Springs area ⓘ Jumbo Mine (B & M Mine; Double Star Mine)	[Opal] Bailey (1946) +2 other references
ⓘ Socrates Mine	[Opal] Bradley (1918)
Cloverdale ⓘ Livermore Quicksilver Mine	[Opal] - (2005)
Mark West Springs ⓘ Goodman Brothers deposit	[Opal] Honke et al. (1950) +1 other reference
ⓘ The Geysers	[Opal] 87-293 +6 other references
Stanislaus County Cooperstown ⓘ Unnamed Diatomite occurrence (1)	[Opal] - (2005)
Crows Landing ⓘ Simon Newman Company deposit	[Opal] - (2005)
Tehama County Inskip Hill ⓘ Unspecified Lava tunnel	[Opal] Anderson (1930) +4 other references
Trinity County Wildhorse Peak ⓘ Red Cliff prospect	[Opal] - (2005)
ⓘ Tulare County	[Opal] Murdoch (1966)
Dumtah ⓘ Van Gordon Creek Prospect	[Opal] Walstrom (n.d.)
Ivanhoe Venice Hills ⓘ Unnamed Semi-precious Gemstone occurrence [1]	[Opal, Opal var: Chrysopal] D. B. Sterrett (1912)
Tuolumne County Chinese Station ⓘ White Rock Mine	[Opal, Opal var: Common Opal, Opal var: Moss Opal, Opal var: Resin Opal] Matthew Stanley Collection
East Belt Big Oak Flat Mining District Groveland ⓘ Sampson Lode prospect	[Opal] - (2005)
ⓘ Ventura County	[Amber] Mason (1976)
Fillmore ⓘ Fillmore deposit	[Opal] Huguenin (1919) +2 other references
Simi Valley ⓘ Northeast side of Simi Valley	[Amber] Murdoch (1934) +1 other reference
Thousand Oaks ⓘ Rolling Oaks Drive	[Opal, Opal-AN var: Hyalite] DeVito (1992)
Colorado Archuleta County Wolf Creek Pass ⓘ Lower East Fork locality	[Opal] Hampson (2004)
Boulder County Boulder County Tungsten Mining District ⓘ Black Hawk No. 1 vein	[Opal] USGS Bull 583
ⓘ Clyde Mine (Lily Mine; Gale Mine; Hoosier; Western Star)	[Opal] Lovering et al. (1950) +1 other reference
Chaffee County ⓘ Browns Canyon Mining District	[Opal] Ralph Van Alstine (1969)
ⓘ Alderman deposit	[Opal] - (2005)
ⓘ Blue Stone Deposit	[Opal] - (2005)
ⓘ Chimney Hill Mine (Morgan Ranch Deposits; Manganese Hill)	[Opal] - (2005)
ⓘ Colorado - American Mine (West Vein; Trefone Adit; East Vein; American Shaft; Mill Adit; Branch or Collins Vein)	[Opal] - (2005)
ⓘ Last Chance Mine (Lower Adit; Kramer Mine; Adit No. 1; Adit No. 2)	[Opal] - (2005)
Poncha Springs ⓘ Lloyd & Delay adit	[Opal] - (2005)
ⓘ Puzzle mine	[Opal] - (2005)
ⓘ Snowflake Deposit	[Opal] - (2005)
ⓘ White King Deposit	[Opal] - (2005)
ⓘ Buena Vista	[Opal] Yalmer Primeau collection
ⓘ Buffalo Peaks	[Opal, Opal-AN] Eckel et al. (1997)
Chalk Creek District ⓘ Hortense Hot Spring	[Opal] Bull. Soc. Franç. Minéralo. ...
ⓘ Mount Princeton Hot Spring	[Opal] Eckel et al. (1997)
Nathrop ⓘ Ruby Mountain	[Opal] USGS Bull 1716C
Poncha Pass Area ⓘ Poncha Hot Springs	[Opal] Eckel et al. (1997)
Sedalia Mining District ⓘ Sedalia Mine (Sedalia Copper Mine)	[Opal] U.S. Geological Survey Professional ... +1 other reference
ⓘ Trout Creek Lycopsid Fossil Forest	[Opal] Mustoe (2025)
Turret Mining District ⓘ Ace High - Jackpot Prospect	[Opal] - (2005)
ⓘ American Flag Mine	[Opal] - (2005)
Clear Creek County Idaho Springs Mining District (Virginia Mining District) ⓘ Gilson Gulch	[Opal] Eckel et al. (1997)
Lamartine Mining District ⓘ Columbia	[Opal] Harrison et al. (1959)
ⓘ Jewelry Shop Mine (West Gold Mine; Sylvanite Mine)	[Opal] Lovering et al. (1950) +2 other references
Conejos County Manassa ⓘ King Turquoise Mine	[Opal] Eckel et al. (1997)
Custer County Rosita Mining District ⓘ Rosita Hills	[Opal] Eckel et al. (1997)
Douglas County Castle Rock Area ⓘ Castle Rock	[Opal] Eckel et al. (1997)
Eagle County Wolcott ⓘ Road side quarry on Hwy 131	[Opal, Opal-AN] collected specimens by Alan Goldstein.
El Paso County Mount Rosa ⓘ Rosa No. 1 trench	[Opal] Eckel et al. (1997)
Fremont County McIntyre Hills Area ⓘ Spikebuck Mine	[Opal] Hanley et al. (1950) +1 other reference
Tallahassee Creek Mining District ⓘ Barbara Claims	[Opal] USGS OFR 84-219 +1 other reference
ⓘ Oliver Saddle Prospect	[Opal] USGS OFR 84-219 +1 other reference
Garfield County Colorado River ⓘ Basalt	[Opal, Opal-AN] Eckel et al. (1997)
ⓘ Piceance Basin	[Opal] Eckel et al. (1997)
Grand County ⓘ Hot Sulfur Springs	[Opal, Opal-AN] Eckel et al. (1997)
Gunnison County ⓘ Gunnison River Gorge	[Opal, Opal-AN] Eckel et al. (1997)
Vulcan Mining District (Cebolla Mining District; Domingo Mining District) Vulcan ⓘ Good Hope Mine (Mammoth Good Hope Mine; Mammoth-Good Hope Mine; Mammoth Chimney Mine)	[Opal, Opal var: Fire Opal] Eckel et al. (1997)
White Earth Mining District (Powderhorn Mining District) ⓘ Alexite Manganese Mine	[Opal] - (2005)
Hinsdale County Galena Mining District (Henson Creek Mining District) ⓘ Henson Creek-Ute Creek	[Opal] Eckel et al. (1997)
Park Mining District (Whitecross Mining District) ⓘ Goodwin's Creek	[Opal, Opal-AN] Eckel et al. (1997)
ⓘ Rio Grande River	[Opal] Eckel et al. (1997)
ⓘ Slumgullion Earthflow (Slumgullion mud flow)	[Opal] Eckel et al. (1997)
Jefferson County Clear Creek Canyon ⓘ C.J.'s Cave	[Opal] Eckel et al. (1997)
Golden Mining District Golden ⓘ Green Mountain	[Opal, Opal var: Fire Opal] Eckel et al. (1997)
ⓘ North Table Mountain	[Opal, Opal var: Fire Opal] Rocks & Minerals 79:4
ⓘ South Table Mountain	[Opal, Opal var: Fire Opal] Wilson (1988)
Lake County Leadville ⓘ Belgian Mine	[Opal] Loughlin (1918)
Breece Hill ⓘ Ibex Mine	[Opal] Loughlin (1918)
Larimer County ⓘ Cache La Poudre River	[Opal, Opal-AN] Eckel et al. (1997)
ⓘ Specimen Mountain	[Opal] Eckel et al. (1997)
Mesa County McInnis Canyons National Conservation Area ⓘ Opal Hill	[Opal] Eckel et al. (1997)
ⓘ Opal Hill	[Opal] Eckel et al. (1997)
ⓘ Piceance Basin	[Opal] Eckel et al. (1997)
Mineral County Creede Mining District ⓘ Creede Formation	[Opal, Opal var: Opal-CT] Eckel et al. (1997)
ⓘ Rio Grande River	[Opal, Opal var: Fire Opal] Eckel et al. (1997)
ⓘ Trout Creek Sulfur Deposit	[Opal] Eckel et al. (1997)
Moffat County Douglas Mountain Mining District ⓘ Browns Park Formation	[Opal] Eckel et al. (1997)
ⓘ Horse Draw	[Opal] Eckel et al. (1997)
Maybell Mining District Maybell Mines ⓘ Gertrude (G-pit)	[Opal] Eckel et al. (1997)
ⓘ Marge Group	[Opal] Eckel et al. (1997)
ⓘ Nederland Mining District	[Opal] Eckel et al. (1997)
Park County South Park Antero Junction ⓘ Agate Creek	[Opal] Eckel et al. (1997)
ⓘ South Park salt works	[Opal] Eckel et al. (1997)
Rio Blanco County ⓘ Piceance Basin	[Opal] Eckel et al. (1997)
Saguache County ⓘ Del Norte Thunder Egg beds	[Opal] Rocks & Minerals (July-August, 2002)
ⓘ La Garita Creek	[Opal, Opal-AN] Eckel et al. (1997)
San Juan County ⓘ South Mineral Creek	[Opal] Desborough et al. (2010)
Summit County Montezuma Area ⓘ Red Jacket (Star of the West; Star of the West No. 2; Mohawk; Iowa)	[Opal] Eckel et al. (1997)
Teller County ⓘ Black Cloud Mine	[Opal] American Mineralogist (1982)
ⓘ Cripple Creek Mining District	[Opal] Eckel et al. (1997)
Bull Hill ⓘ Blue Bird Mine	[Opal] Lindgren et al. (1906)
ⓘ Blue Bird Vein	[Opal] Rob Lavinsky (ex. Rochard Kosnar specimen)
ⓘ Orpha May	[Opal] Eckel et al. (1997)
ⓘ Zenobia Mine	[Opal] Carnein et al. (2005)
ⓘ Divide	[Opal] Eckel et al. (1997)
Florissant (Topaz Butte) Florissant Area ⓘ Florissant Fossil Beds National Monument	[Opal, Opal var: Opal-CT] KellerLynn (2006)
ⓘ South Fork Twin Creek	[Amber] Kirejtshuk et al. (2008)
Weld County Stoneham ⓘ Sterling Mine	[Opal] Eckel et al. (1997)
Yuma County Republican River ⓘ South Fork	[Opal, Opal var: Moss Opal] Eckel et al. (1997)
Connecticut Fairfield County Bethel ⓘ Biermann Quarries (Bethel quarries; Codfish Hill Quarry)	[Opal, Opal-AN] Januzzi et al. (1976)
Brookfield ⓘ U. S. Route 7 Expressway (Danbury line to Iron Works District)	[Opal, Opal-AN] Januzzi (1994)
Danbury ⓘ North Street mall ?	[Opal, Opal-AN] Januzzi et al. (1976)
ⓘ Western Connecticut State University	[Opal, Opal-AN] Januzzi (1994)
Newtown Hawleyville ⓘ Sky Ridge railroad cut ?	[Opal, Opal-AN] Januzzi et al. (1976)
Redding Branchville ⓘ Fillow Quarry	[Opal, Opal-AN] Januzzi et al. (1976) +1 other reference
ⓘ Ridgefield	[Opal, Opal-AN] Januzzi et al. (1976)
ⓘ Casey Quarry (Ridgefield pegmatite)	[Opal, Opal-AN] Januzzi et al. (1976)
Trumbull Long Hill ⓘ Old Mine Park (Old Tungsten Mine)	[Opal, Opal-AN] Januzzi et al. (1976)
ⓘ Old Mine Plaza construction site	[Opal, Opal-AN] field trip report
Hartford County Glastonbury ⓘ Hale's Quarry	[Opal, Opal-AN]
South Glastonbury ⓘ Eureka Quarries	[Opal, Opal-AN] Moritz (n.d.)
ⓘ Hollister prospects	[Opal, Opal-AN] Betts (1999)
ⓘ Howe Quarry (Howe #1 Quarry; Huspband Quarry)	[Opal, Opal-AN] Moritz (n.d.)
ⓘ Simpson prospect #1	[Opal, Opal-AN] Tony Albini Collection
ⓘ Simpson Quarry (Wiarda Quarry)	[Opal, Opal-AN] Betts (1999)
ⓘ Newington	[Opal, Opal-AN] P Cristofono collection
ⓘ 2368-2384 Berlin Turnpike (Former Hartford Drive-In)	[Opal, Opal-AN] Cristofono (n.d.)
Rocky Hill ⓘ Rocky Hill Quarry	[Opal, Opal-AN] Shepard (1837)
Litchfield County ⓘ Cornwall	[Opal] Shepard (1837)
ⓘ Mine Mountain graphite prospect	[Opal, Opal-AN] Ed Force collection
Harwinton ⓘ Lead Mine Brook	[Opal, Opal-AN] A. Berluti collection
ⓘ State Routes 8 and 118 interchange	[Opal, Opal-AN] Januzzi et al. (1976)
ⓘ Morris	[Opal, Opal-AN] Michael Otto collection
New Milford Upper Merryall ⓘ New England Mining Company Quarry	[Opal, Opal-AN] Januzzi et al. (1976)
Roxbury Mine Hill ⓘ Roxbury Iron Mine	[Opal, Opal-AN] Januzzi et al. (1976)
Thomaston ⓘ Reynolds Bridge	[Opal, Opal-AN var: Hyalite] Yedlin (1964)
Thomaston Dam ⓘ Thomaston Dam railroad cut	[Opal, Opal-AN] Januzzi et al. (1976)
Torrington ⓘ Torringford	[Opal] Orcutt (1878)
Woodbury ⓘ Nonnewaug River Industrial Park	[Opal, Opal-AN] Mike Polletta Observation
Middlesex County ⓘ Durham	[Opal, Opal-AN] Personally collected by A. Berluti in ...
ⓘ Pegmatite outcrops	[Opal, Opal-AN] Collected by A. Berluti in 2009-11
East Hampton ⓘ Anderson No. 1 Mica Mine	[Opal, Opal-AN] Jones (1960)
Cobalt ⓘ Great Hill cobalt mines	[Opal, Opal-AN] Januzzi et al. (1976)
ⓘ Nathan Hall Quarry	[Opal, Opal-AN] Moritz (n.d.)
ⓘ Slocum prospect	[Opal, Opal-AN] Schooner (1958 and 1961) +1 other reference
ⓘ Worth and Selden Quarries (Victoria Quarry)	[Opal, Opal-AN] Schooner (1958) +1 other reference
Haddam Haddam Neck ⓘ Rock Landing Quarry (Capt. Rohrback Quarry)	[Opal, Opal-AN] Jones (1960)
ⓘ Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry)	[Opal, Opal-AN] Kevin Czaja Collection
Higganum ⓘ Forest Ridge Road	[Opal, Opal-AN] Former Don Miller collection
ⓘ Haddam Volunteer Fire Station	[Opal, Opal-AN] Former Don Miller collection
ⓘ Jail Hill Road locality (Jail Hill Quarry)	[Opal, Opal-AN] Kevin Czaja Collection
ⓘ John Salak Quarry	[Opal, Opal-AN] Kevin Czaja Collection
Middletown White Rock Mining District ⓘ Riverside Quarry (Western Quarry)	[Opal, Opal-AN] Moritz (n.d.)
ⓘ White Rocks Quarry (Consolidated Quarry)	[Opal, Opal-AN] Moritz (n.d.) +1 other reference
Portland ⓘ Case Quarries	[Opal, Opal-AN] Jones et al. (1960)
Collins Hill ⓘ Hale-Walker prospects	[Opal] Januzzi et al. (1976)
Strickland pegmatite ⓘ Strickland Quarry	[Opal, Opal-AN] Schooner (1955)
ⓘ Gotta-Walden Prospect	[Opal, Opal-AN] Jones (1960)
ⓘ Hale Quarry (Andrews Quarry; Glastonbury Quarry)	[Opal, Opal-AN] Jones (1960)
ⓘ Pelton's Quarry	[Opal, Opal-AN] Jones (1960)
ⓘ Walden Gem Quarry	[Opal, Opal-AN] Rocks & Minerals (1970)
New Haven County Branford ⓘ Stony Creek Quarry (Norcross Granite Gneiss Rock Quarries; Castellucci Quarry)	[Opal, Opal-AN] Moritz (n.d.)
ⓘ Southbury	[Opal, Opal-AN] Brace (1823) +1 other reference
Southford ⓘ Curtis Quarry	[Opal, Opal-AN] Ryerson (1972)
Waterbury ⓘ Blue Stone Quarry	[Opal, Opal-AN] Visually identified at a CT museum
ⓘ Delaware	[Amber] World of Amber
ⓘ District of Columbia (Washington D.C.)	[Opal] Bernstein (1976)
Florida Hillsborough County Tampa Tampa Bay ⓘ Ballast Point	[Opal] Zeitner (1968)
ⓘ Deep Ocean Pocket	[Opal] Cochrane et al. (2026)
Lake County ⓘ Unnamed Diatomite Deposit (MRDS - 10142925)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10191671)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10240829)	[Opal] U.S Geological Survey +1 other reference
ⓘ Unnamed Diatomite Deposit (MRDS - 10240851)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10241412)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10264633)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10289164)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposits (MRDS - 10143586)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposits (MRDS - 10167682)	[Opal] - (2005)
ⓘ Unnamed Peat Deposit (MRDS - 10167814)	[Opal] - (2005)
Osceola County ⓘ Unnamed Diatomite prospect [1]	[Opal] - (2005)
Polk County Central Florida Phosphate Mining District (Bone Valley) Homeland ⓘ Clear Spring Mine	[Opal] Marc V. Hurst (2012)
ⓘ Homeland Mine	[Opal]
ⓘ Unnamed Diatomate Prospect (MRDS - 10288756)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10119015)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10216092)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10265198)	[Opal] - (2005)
ⓘ Unnamed Diatomite Deposit (MRDS - 10265300)	[Opal] - (2005)
ⓘ Unnamed Diatomite Prospect (MRDS - 10119005)	[Opal] - (2005)
ⓘ Unnamed Diatomite Prospect (MRDS - 10168107)	[Opal] - (2005)
ⓘ Unnamed Diatomite Prospect (MRDS - 10191911)	[Opal] - (2005)
ⓘ Unnamed Diatomite Prospect (MRDS - 10241211)	[Opal] - (2005)
Georgia Bartow County Cartersville Mining District ⓘ Cartersville	[Opal, Opal-AN] Rocks & Min.: 64:185.
Bibb County ⓘ Pikes Peak Fuller's Earth	[Opal] - (2005)
Brooks County ⓘ Lot 270	[Opal] Cook (1978)
ⓘ Bulloch County	[Opal, Opal var: Fire Opal] - (1917)
Burke County ⓘ Brier Creek	[Opal]
Girard Mining District ⓘ Girard	[Opal, Opal-AN] Rocks & Min.: 64:187.
ⓘ Stony Bluff	[Opal, Opal-AN] Cook (1978)
ⓘ Chattooga County	[Opal] Ransom (1974)
Columbia County Augusta (north of) ⓘ Dan Quarry	[Opal, Opal-AN] Rocks & Min.:64:190.
ⓘ DeKalb County	[Opal, Opal-AN] Ransom (1974)
Stone Mountain-Lithonia Mining District ⓘ Ethel quarry	[Opal, Opal-AN] Cook (1978)
ⓘ Flat Rock Quarry	[Opal, Opal-AN] Cook (1978)
ⓘ Hayne Quarry	[Opal, Opal-AN, Opal-AN var: Hyalite] Cook (1978)
ⓘ Floyd County	[Opal, Opal-AN] Betts (n.d.)
Cave Spring ⓘ Asbury Mine	[Opal, Opal-AN] Rocks & Min.:64:195 +1 other reference
ⓘ Meriwether County	[Opal] Ransom (1974)
ⓘ Muscogee County	[Opal] Ransom (1974)
Rabun County Burton ⓘ Miller Asbestos Mine	[Opal, Opal-AN] Cook (1978)
ⓘ Laurel Creek complex	[Opal, Opal-AN]
ⓘ Richmond County	[Opal] Cook (1978)
ⓘ Screven County	[Opal, Opal-AN] - (1917)
ⓘ Washington County	[Opal, Opal var: Fire Opal] Cook (1978)
Warthen ⓘ Dick Warthen property	[Opal] Cook (1978)
White County Cleveland ⓘ Tesnatee Creek Bridge	[Opal, Opal-AN] Cook (1978)
ⓘ Guam	[Opal] Schlanger (1964)
Hawaii Hawaii County Kilauea Volcano East Rift Zone ⓘ SOH-4 borehole	[Opal] Bargar et al. (1996)
ⓘ South Sulfur Bank	[Opal, Opal var: Opal-A] Bishop et al. (2024)
ⓘ Unspecifed lava tubes (lava caves)	[Opal] Hon et al. (2009)
Honolulu County Oahu Island Koolau Range (Koolau caldera) Kailua ⓘ Keolu Hills	[Opal] Fujishima et al. (1977)
ⓘ Idaho	[Opal] Gübelin et al. (1976)
Ada County Boise Mining District ⓘ Diatomite Occurrence (MRDS - 10089089)	[Opal] - (2005)
ⓘ Unnamed Diatomite occurrence [1]	[Opal] - (2005)
ⓘ Unnamed Diatomite occurrence [2]	[Opal] - (2005)
Adams County Indian Valley Area ⓘ Diatomite Occurrence (MRDS - 10090104)	[Opal] - (2005)
Blaine County ⓘ Little Wood Reservoir	[Opal] Bill Hamel Collection
Boise County Idaho City Mining District Idaho City ⓘ Moore Creek	[Opal, Opal var: Fire Opal] Dake (1956)
Camas County Fairfield Area ⓘ Diatomite Occurrence	[Opal] - (2005)
Clark County Dubois ⓘ Highway 22 Road Cut	[Opal, Opal-AN var: Hyalite] Kim Strange collection
Spencer ⓘ Opal Mountain Mine	[Opal, Opal var: Precious Opal] Extra Lapis - English No. 10 Opal
ⓘ Spencer Opal Mine	[Opal, Opal var: Opal-A, Opal var: Opal-CT, Opal var: Precious Opal, Opal var: Quinzite Opal, Precious Opal var: Pinfire Opal] Hennebois et al. (2025)
Custer County Bay Horse Mining District Challis ⓘ Spar Canyon	[Opal] Ream (2004)
ⓘ Mackay Mining District (Alder Creek Mining District; White Knob Mining District)	[Opal] Dake (1956)
ⓘ Rat's Nest claim	[Opal, Opal-AN] John Cornish collection
Elmore County Glenns Ferry Area ⓘ Diatomite Deposit (MRDS - 10070133)	[Opal] - (2005)
ⓘ Diatomite Deposit (MRDS - 10070134)	[Opal] - (2005)
ⓘ Diatomite Deposit (MRDS - 10093442)	[Opal] - (2005)
King Hill Area ⓘ Diatomite Deposit (MRDS - 10089070)	[Opal] - (2005)
ⓘ Diatomite Mine	[Opal] - (2005)
Gem County Cascade Area ⓘ Diatomite Occurrence (MRDS - 10070230)	[Opal] - (2005)
Emmett ⓘ Squaw Butte	[Opal] The Mineralogist
Idaho County ⓘ Freedom	[Opal] C. Lemanski (re-entry lost Mindat data)
Riggins ⓘ Squaw Creek	[Opal] Tschernich et al. (1982) +1 other reference
Kootenai County ⓘ Setters	[Opal] Dake (1956)
Latah County ⓘ Kendrick	[Opal] Dake (1956)
ⓘ Moscow	[Opal, Opal var: Precious Opal] The Moscow Opal Mines 1890 to 1893 (The First Commercial Opal Mines in the United States)
ⓘ Whelan	[Opal, Opal var: Precious Opal] Dake (1956)
Lemhi County Blackbird Mining District ⓘ Cutler Opal Occurrence	[Opal] - (2005)
ⓘ Blue Grouse Opal Mine	[Opal, Opal var: Precious Opal] Christopher Wentzell collection (2020)
ⓘ Cathedral Rock pluton	[Opal] WC van Laer
ⓘ Panther Creek	[Opal] Dake (1956)
Salmon ⓘ Idaho Blue Mine	[Opal, Opal var: Precious Opal] Extra Lapis - English No. 10 Opal
Lincoln County ⓘ Clover Creek	[Opal] Dake (1956)
Nez Perce County ⓘ Lewiston	[Opal, Opal var: Fire Opal] Dake (1956)
ⓘ Owyhee County	[Opal] Beste (2005)
ⓘ Bruneau Jasper (Bruneau Canyon 1-5; Bruneau Group Jasper)	[Opal, Opal var: Fire Opal] USGS Bulletin 1720b
ⓘ Enterprise	[Opal, Opal var: Precious Opal] Dake (1956)
French Mining District ⓘ Diatomite Mine (Bates Creek)	[Opal] - (2005)
ⓘ Lucky Boy Group	[Opal] - (2005)
Marsing Area ⓘ Pumice Occurrence (MRDS - 10070280)	[Opal] - (2005)
ⓘ Opaline	[Opal, Opal var: Fire Opal] Dake (1956)
ⓘ Pumicite Deposit (MRDS - 10089547)	[Opal] - (2005)
Reynolds Area ⓘ Diatomite Occurrence (MRDS - 10106007)	[Opal] - (2005)
Riddle Area ⓘ Diatomite Occurrence (MRDS - 10078458)	[Opal] - (2005)
Twin Falls County Buhl Area ⓘ Ray Banbury Diatomite Deposit	[Opal] - (2005)
Valley County Big Creek Mining District ⓘ Bear Trap Prospect	[Opal] - (2005)
ⓘ Ketchum Claim	[Opal] - (2005)
ⓘ W. K. No. 1 Claim	[Opal] - (2005)
Marble Creek Mining District ⓘ Grays Peak Opal Deposit	[Opal] - (2005)
Monumental Creek Mining District ⓘ Monument Prospect	[Opal] - (2005)
ⓘ Redridge Group Mine	[Opal] - (2005)
Washington County Monroe Mining District ⓘ Diatomite Occurrence (MRDS - 10078450)	[Opal] - (2005)
Weiser Mining District ⓘ Diatomite Occurrence (MRDS - 10093747)	[Opal] - (2005)
ⓘ Helen Zucker Prospect (Zucker Property; Parker Group)	[Opal] - (2005)
ⓘ Idaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project)	[Opal] - (1956) +1 other reference
ⓘ Virginia L. Claims (Raft Creek Cinnabar; Lackey Mine)	[Opal] - (2005)
Weiser ⓘ Diatomite Mine (MRDS - 10070229)	[Opal] - (2005)
ⓘ Diatomite Occurrence	[Opal] - (2005)
Illinois ⓘ Alexander County	[Opal] Dake
ⓘ Union County	[Opal] Dake
Indiana Henry County ⓘ New Albany shale	[Opal] Erd et al. (1960)
ⓘ Perry County	[Opal] Erd et al. (1960)
Kansas ⓘ Clark County	[Opal, Opal var: Moss Opal] Kansas Geological Survey Educational ... +1 other reference
ⓘ Ellis County	[Opal] Kansas Geological Survey Educational ... +1 other reference
ⓘ Ellsworth County	[Amber, Amber var: Jelinite] ...
ⓘ Smoky Hill River amber locality	[Amber] C. Lemanski (re-entry lost Mindat data)
ⓘ Logan County	[Opal, Opal var: Moss Opal] Kansas Geological Survey Educational ... +1 other reference
ⓘ Ness County	[Opal] Kansas Geological Survey Educational ... +1 other reference
ⓘ Rawlins County	[Opal] Kansas Geological Survey Educational ... +1 other reference
ⓘ Wallace County	[Opal, Opal var: Moss Opal] Ransom (1974)
ⓘ Kentucky	[Opal] Anderson (1994)
Louisiana Catahoula Parish ⓘ Harrisonburg	[Opal] Earth Treasures Vol 4
Ouachita Parish ⓘ West Monroe	[Opal] Ransom (1974)
Vernon Parish ⓘ Hidden Fire Opal Mine (Louisiana Opal Exchange Mine)	[Opal, Opal var: Precious Opal] R&M 69:3 pp 156-162
Maine Androscoggin County Auburn East Mount Apatite Mining District ⓘ Maine Feldspar Quarry	[Opal, Opal-AN] Bill Bunn
Cumberland County Baldwin West Baldwin ⓘ Estes Quarry	[Opal, Opal-AN]
Casco ⓘ Heath Quarry	[Opal, Opal-AN] Cristofono (n.d.)
ⓘ Freeport	[Opal, Opal-AN] King et al. (1994)
Knox County Warren ⓘ Starrett Quarries	[Opal]
Oxford County Albany ⓘ Donahue Quarry (Donahue Prospect)	[Opal] King (2009)
ⓘ Songo Pond Quarry (Kimball Ledge Quarry)	[Opal, Opal-AN] Thompson et al. (1998)
Buckfield ⓘ Bennett Quarry	[Opal, Opal-AN] ...
Greenwood ⓘ Hayes Ledge Quarries (East and West)	[Opal, Opal-AN] Mathieu Butler collection
ⓘ Heikkinen Quarry	[Opal, Opal-AN] Thompson et al. (1998)
Uncle Tom Mountain ⓘ Emmons Quarry	[Opal, Opal-AN var: Hyalite] Falster et al. (2019)
Newry ⓘ Bell pit	[Opal, Opal-AN] Moritz (n.d.)
ⓘ Crooker Gem Pegmatite Quarries	[Opal, Opal-AN] King et al. (1994) +1 other reference
ⓘ Dunton Gem Quarry	[Opal, Opal-AN] King et al. (1994) +1 other reference
ⓘ Rose Quartz crystal locality (Pegmatite 24)	[Opal, Opal-AN] King et al. (6) +1 other reference
Paris ⓘ Mount Mica Quarry	[Opal, Opal-AN] King et al. (1994)
ⓘ Ryerson Hill Quarries	[Opal, Opal-AN, Opal-AN var: Hyalite]
Peru ⓘ Perry Petalite prospect	[Opal, Opal-AN] Dionne et al. (2014)
Rumford ⓘ Black Mountain Quarry	[Opal, Opal-AN]
Stoneham ⓘ Lord Hill Quarry (Lord Hill Mine)	[Opal, Opal-AN] A.Mathauser collection
Sagadahoc County Topsham Standpipe Hill Quarries ⓘ Yedlin Locality	[Opal, Opal-AN] Thompson et al. (1998)
ⓘ Undivided Quarry	[Opal, Opal-AN] Rocks & Min.: 62:413.
ⓘ William Willes #1 Quarry	[Opal, Opal-AN] King (n.d.)
Maryland Anne Arundel County Arnold Magothy River ⓘ Cape Sable	[Amber] Kunz (1890) +1 other reference
ⓘ Garey Ore Bank	[Opal, Opal-AN var: Hyalite] Jat Thompson Collection
Baltimore County Bare Hills ⓘ Bare Hills Serpentine Quarry East	[Opal] Ostrander et al. (1940)
ⓘ Unnamed Chromite prospects	[Opal] Ostrander et al. (1940)
Delight ⓘ Calhoun Mine	[Opal] Pearre (1960)
Soldiers' Delight ridge ⓘ Delight Quarry (Soldier's Delight Quarry; Dyer Quarry)	[Opal] Rocks & Min.:11:111 +1 other reference
Windsor Mill ⓘ Lord Baltimore Drive Quartz occurrence area	[Opal, Opal var: Amber Opal, Opal var: Common Opal, Opal var: Jelly Opal, Opal-AN var: Hyalite] Jat Thompson
Woodlawn ⓘ Patapsco Glen Construction Site	[Opal, Opal-AN] Stuart Herring Collection
Calvert County ⓘ Old Greensand-Diatomaceous Earth Pit	[Opal] - (2005)
Cecil County Pilot ⓘ Wiant's Quarry (Weiant Quarry)	[Opal] Ostrander et al. (1940)
Harford County Cardiff ⓘ Maryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry)	[Opal, Opal-AN] Ostrander et al. (1940) +1 other reference
Montgomery County Rockville ⓘ Hunting Hill Quarry	[Opal] Bernstein (1980)
ⓘ White Oak	[Opal, Opal-AN] Cordua (1969)
ⓘ Paint Branch	[Opal] Bernstein (1980)
ⓘ Massachusetts	[Amber] Mason (1976)
Berkshire County ⓘ Florida	[Opal, Opal-AN] Gleba (2008)
Dukes County Martha's Vineyard Aquinnah ⓘ Gay Head Cliffs	[Amber] Robinson (1825) +1 other reference
Essex County ⓘ Boxford	[Opal] Sears (1905)
ⓘ Danvers	[Opal] Sears (1905)
ⓘ Gloucester	[Opal, Opal-AN] Gleba (2008)
ⓘ Blackburn Circle locality	[Opal, Opal-AN] P Cristofono collection
ⓘ Railcut Hill	[Opal, Opal-AN] P. Cristofono collection
ⓘ State Route 128 road cut/Cherry Hill area	[Opal, Opal-AN] Gleba (2008)
Newbury ⓘ Devil's Basin	[Opal, Opal-AN] P. Cristofono collection
North Andover ⓘ Route 114 calc-silicate locality	[Opal, Opal-AN] P Cristofono collection
ⓘ Salem	[Opal, Opal-AN] P Cristofono collection
Franklin County Deerfield ⓘ Cheapside Quarry (East Deerfield Quarry; Trew Corp. Quarry)	[Opal, Opal-AN] Emerson (1882) +1 other reference
ⓘ Leverett	[Opal, Opal-AN] Emerson (1895)
ⓘ East Mine	[Opal, Opal-AN] Emerson (1895)
Hampden County Monson ⓘ Monson quarries (Flynt quarries)	[Opal, Opal-AN] Emerson (1895)
Hampshire County Easthampton ⓘ Loudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine)	[Opal] Gleba (2008)
Granby ⓘ Ondrick Quarry	[Opal, Opal-AN] Cristofono (n.d.)
ⓘ Middlesex County	[Opal, Opal-AN] Gleba (2008)
Ashland ⓘ Aggregate Industries Quarry (Bayer-Mingolla Quarry; Trimount Quarry)	[Opal, Opal-AN] Gleba (2008)
Dracut ⓘ PJ Keating Quarry (Dracut Quarry; Condon Quarry; Essex Bituminous)	[Opal, Opal-AN] P. Cristofono collection
Holliston ⓘ Miller Hill Quarry (Jursek's Crushstone Quarry)	[Opal, Opal-AN] Gleba (2008)
Hudson ⓘ Route 62 locality (Potash Hill)	[Opal, Opal-AN] P Cristofono collection 2010
ⓘ Malden	[Opal] Gleba (2008)
Marlborough ⓘ Marlborough Junction locality	[Opal, Opal-AN] P Cristofono collection
ⓘ Waltham	[Opal, Opal-AN] Gleba (2008)
Weston ⓘ Massachusetts Broken Stone Co. quarries (Weston Quarry; Stony Brook Quarry)	[Opal, Opal-AN] Gleba (2008)
Woburn ⓘ Blueberry Mountain Quarry (Blueberry Hill)	[Opal, Opal-AN] Rocks & Min.: 21:75. +1 other reference
Nantucket County ⓘ Nantucket	[Amber] Robinson (1825) +1 other reference
Norfolk County Wrentham ⓘ Aggregate Industries Quarry (Wrentham Quarry; Simeone Quarry)	[Opal]
Suffolk County Boston West Roxbury ⓘ West Roxbury Crushed Stone Quarry (West Roxbury Trap Rock Co. Quarry; Grove St. Quarry)	[Opal, Opal-AN] Gleba (2008)
Worcester County Bolton ⓘ Bolton Lime Quarries (Bolton Quarry; Whitcomb Quarry; Hildreth Quarry)	[Opal, Opal-AN] Gleba (2008)
Fitchburg ⓘ Rollstone Hill Quarries	[Opal, Opal-AN] Cristofono (n.d.)
ⓘ South Street construction site	[Opal, Opal-AN] P Cristofono collection
Hardwick ⓘ Quabbin Aqueduct shaft No. 10 locality	[Opal, Opal-AN] Gleba (2008)
Leominster ⓘ Jungle Road area	[Opal, Opal-AN] Cristofono (n.d.)
ⓘ Lunenburg	[Opal, Opal-AN] T Mortimer collection
ⓘ Route 13 area	[Opal, Opal-AN] Cristofono (n.d.)
Minnesota ⓘ Washington County	[Opal] Ransom (1974)
ⓘ Mississippi	[Amber] Mason (1976)
ⓘ Claiborne County	[Opal] Journal of the Mississippi Academy of ...
Tallahatchie County ⓘ Charleston	[Amber] Beste (2005)
Tippah County ⓘ Fuller's Earth; Ripley; Mississippi	[Opal] - (2005)
ⓘ Fullers Earth; Blue Mountain; Mississippi	[Opal] - (2005)
Tishomingo County ⓘ Eastport	[Opal] Lowe (1919)
ⓘ Paden	[Amber] Lowe (1919)
Missouri Camden County ⓘ Decaturville crater	[Opal] Sherwood et al. (1998)
ⓘ Chariton County	[Opal] Ransom (1974)
Jackson County ⓘ Westerville Limestone	[Opal] Rocks & Min.
Newton County Seneca ⓘ American Tripoli	[Opal] USGS Bulletin 340J
ⓘ Stella	[Opal] Dake
Wayne County ⓘ Granite Knob (Granite Bend)	[Opal, Opal-AN] Sherwood et al. (1998)
Montana ⓘ Beaverhead County	[Opal] Ransom (1974)
Big Horn County ⓘ Pryor Mountains	[Opal] Anita Moore-Nall and David R. Lageson (2015)
Fergus County South Moccasin Mountains ⓘ Whiteware Clay occurrence (Lewistown Kaolinite)	[Opal] - (2005)
ⓘ Gallatin County	[Opal] Ransom (1974)
ⓘ Hyalite Peak	[Opal, Opal-AN var: Hyalite] Hodges et al. (2006)
ⓘ Three Forks Placer	[Opal] Lavinsky (n.d.)
Jefferson County ⓘ Boulder Batholith	[Opal, Opal-AN var: Hyalite] Paul Senn Field Work/Research
Clancy-Lump Gulch Mining District ⓘ W. Wilson Mine (Liverpool Mine)	[Opal, Opal-AN] Meschter (1953)
Elkhorn Mining District ⓘ Golden Curry Mine (Sourdough mine; Jacqueline; Jacquemin)	[Opal] Knopf (1913)
Lewis and Clark County Blue Cloud Mining District ⓘ Dutro Mine (Old Dominion)	[Opal] - (2005)
Madison County Lower Hot Springs Mining District (Norris Mining District) ⓘ Red Bluff	[Opal] Winchell (1914)
Missoula County ⓘ Pattee Canyon	[Opal, Opal var: Opal-CT] University of Adelaide - Tate Museum ...
Park County ⓘ Gallatin Petrified Forest	[Opal] Mustoe (2025)
Wibaux County ⓘ St Philips	[Opal] Tucker (n.d.) +1 other reference
Nebraska ⓘ Boyd County	[Opal]
ⓘ Brown County	[Opal]
ⓘ Ainsworth	[Opal] Pabian (1971)
ⓘ Chase County	[Opal] Pabian (1971)
ⓘ Imperial	[Opal] Kelly Nash Collection
ⓘ Cherry County	[Opal]
ⓘ Valentine	[Opal] Pabian (1971)
ⓘ Cheyenne County	[Opal] Pabian (1971)
Cuming County ⓘ West Point	[Opal] Rocks & Minerals (1955)
Custer County ⓘ Arnold	[Opal, Opal var: Precious Opal] Pabian (1971)
ⓘ Dawes County	[Opal] R.J. Dunham (1955)
ⓘ Deuel County	[Opal] Pabian (1971)
ⓘ Chappell	[Opal] Zeitner (1956)
Dodge County ⓘ Fremont	[Opal] Pabian (1971)
ⓘ Douglas County	[Opal, Opal var: Moss Opal] Ransom (1974)
ⓘ Furnas County	[Opal] Pabian (1971)
ⓘ Beaver City	[Opal, Opal var: Precious Opal] Pabian (1971)
ⓘ Harlan County	[Opal] Pabian (1971)
ⓘ Republican City	[Opal] Pabian (1971)
ⓘ Keya Paha County	[Opal]
ⓘ Kimball County	[Opal] Pabian (1971)
Morrill County ⓘ Angora	[Opal] Pabian (1971)
ⓘ Bridgeport	[Opal, Opal var: Moss Opal, Opal var: Precious Opal] MacFall (1975)
ⓘ Scotts Bluff County	[Opal] Ransom (1974)
ⓘ Sheridan County	[Opal] Ransom (1974)
ⓘ Sioux County	[Opal] Ransom (1974)
ⓘ Agate	[Opal, Opal var: Precious Opal] Eldridge (1947)
ⓘ Nevada	[Opal] Gübelin et al. (1976)
ⓘ Black Rock Desert	[Opal] Colburn (2010)
Carson City Delaware Mining District ⓘ Brunswick Canyon	[Opal] Castor et al. (2004)
Churchill County Dixie Valley Mining District ⓘ Dixie Comstock mine	[Opal] Econ Geol (1994)
ⓘ Dixie Valley	[Opal] LUTZ et al. (May 7–9, 2002)
ⓘ Cottonwood Canyon	[Opal] Castor et al. (2004)
Leete Mining District ⓘ Bradys Hot Springs	[Opal] Castor et al. (2004)
ⓘ Salt Wells basin	[Opal] Cahit Helvaci et al. (2012) +1 other reference
Wild Horse Mining District Shoshone Creek Canyon ⓘ Red Bird Mine	[Opal] Castor et al. (2004)
Clark County Gold Butte Mining District ⓘ Horse Springs claims	[Opal] Castor et al. (2004)
Muddy Mountains ⓘ Bitter Springs trail	[Opal] Castor et al. (2004)
ⓘ Muddy Mountains Mining District	[Opal] Castor et al. (2004)
Virgin Mountains ⓘ Bunkerville Mining District	[Opal] Castor et al. (2004)
Douglas County Pine Nut Mountains Delaware Mining District ⓘ Julietta prospect	[Opal] - (2005)
Elko County Coal Mine Mining District ⓘ Coal Canyon Mine (Garnet claims)	[Opal] LaPointe et al. (199)
Contact Mining District ⓘ Silver Star Mine (Alabama Mine [?]; Silver Queen Mine [?])	[Opal] LaPointe et al. (199)
Delano Mining District ⓘ Indian Springs Tungsten Mine (Gamble Ranch Mine; Ludwig Tungsten Mine; Tunnel Mine)	[Opal] LaPointe et al. (199) +2 other references
ⓘ Podner claims	[Opal] LaPointe et al. (199)
ⓘ Tin occurrence	[Opal] LaPointe et al. (199)
ⓘ Dolly Varden Mining District	[Opal] Castor et al. (2004)
Ferber Mining District ⓘ Unnamed prospect	[Opal] Castor et al. (2004)
Gold Circle Mining District (Midas Mining District) ⓘ Red Arrow claims	[Opal] LaPointe et al. (199)
Huntington Creek Mining District ⓘ Opal; Opal Annex claims (White Hill No. 1)	[Opal] LaPointe et al. (199)
ⓘ Ivanhoe Mining District	[Opal] USGS Open-File Report 76-56 +2 other references
ⓘ Coleman group (Midas)	[Opal] LaPointe et al. (199)
ⓘ Fox Mine (Pangburn property; Governor group)	[Opal] LaPointe et al. (199)
ⓘ Governor Mine (Hunt property; Silver Fox Mine; Combination Mine; Florence Mine; Portland claims)	[Opal] - (2005)
ⓘ Hatter prospect	[Opal] LaPointe et al. (199)
ⓘ Hollister deposit (Ivanhoe/USX; Butte; Velvet; Clementine)	[Opal] Cain et al. (2007)
ⓘ Jackson & Surprise claims	[Opal] LaPointe et al. (199)
ⓘ Lark group (Rattlesnake; Lucky Boy; Davis and Roseberry; Cinnabar group; Ivanhoe; Lark Quick)	[Opal] LaPointe et al. (199)
ⓘ Old Timer Mine	[Opal] LaPointe et al. (199)
ⓘ Redboy group	[Opal] LaPointe et al. (199)
ⓘ Rimrock and Homestake Mines (Wilburg Mine; Ivanhoe Cinnabar Mine)	[Opal] LaPointe et al. (199)
ⓘ Silver Cloud Mine	[Opal] - (2005)
ⓘ Silver Cloud Mine (New Verde Mine)	[Opal] NBMG Open File report 83-9 +2 other references
ⓘ Unnamed Mercury prospects (IV-18)	[Opal] LaPointe et al. (199)
ⓘ Velvet Mine	[Opal] LaPointe et al. (199)
ⓘ Jarbidge Mining District	[Opal, Opal-AN] LaPointe et al. (199)
Kinsley Mining District ⓘ Kinsley Mountain deposit	[Opal] LaPointe et al. (199)
Loray Mining District ⓘ Unnamed workings (Alabama; New Deal; May Bell; Lost Hope; Silver Bell; Silver Star claims?)	[Opal] LaPointe et al. (199)
ⓘ Mountain City Mining District	[Opal] USGS Open-File Report 76-56
Mud Springs Mining District ⓘ Bellehelen mine	[Opal] Castor et al. (2004)
Pequop Mining District ⓘ Oasis	[Opal] Castor et al. (2004)
ⓘ Railroad Mining District	[Opal] USGS Bull 1162B
Rock Creek Mining District ⓘ Horse Mountain mine (Staggs and Quilici group)	[Opal] LaPointe et al. (199)
ⓘ Silver V claims (Fisher prospects)	[Opal] LaPointe et al. (199)
ⓘ Teapot Mine	[Opal] LaPointe et al. (199)
Ruby Valley Mining District ⓘ Sulphur Hot Spring	[Opal] Castor et al. (2004)
Scraper Springs Mining District ⓘ Willow claims	[Opal] LaPointe et al. (199)
Esmeralda County Coaldale Mining District ⓘ Blanco mine	[Opal] - (2005)
Cuprite Mining District ⓘ Ralston prospect (Eclipse)	[Opal] Castor et al. (2004) +1 other reference
ⓘ Sulfur Prospect No. 1	[Opal] - (2005)
Fish Lake Valley Mining District ⓘ B&B mine	[Opal] - (1979) +2 other references
ⓘ Buckskin mine	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ Crimson Crown mine	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ F & L mine	[Opal] NBMG Bull 78 Geology and Mineral ... +1 other reference
ⓘ Last One Prospect	[Opal] - (2005)
ⓘ McNutt mine	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ Red Rose mine	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ Sundown mine	[Opal] NBMG Bull 78 Geology and Mineral ...
Gilbert Mining District ⓘ NBMG Sample Site 1268	[Opal] - (2005)
ⓘ Goldfield Mining District	[Opal] Castor et al. (2004)
Montezuma Mining District ⓘ Montezuma prospect	[Opal] NBMG Bull 78 Geology and Mineral ...
Red Mountain Mining District ⓘ Black Rock prospect	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ Rhyolite Ridge Li-B Deposit	[Opal, Opal-AN] American Mineralogist 19:268-274
Silver Peak Range ⓘ Esmeralda formation	[Opal] Castor et al. (2004)
Tokop Mining District ⓘ Empress Mine	[Opal, Opal-AN var: Hyalite] - (2005)
Tonopah Mining District ⓘ Garibaldi claim group	[Opal] NBMG Bull 78 Geology and Mineral ...
ⓘ Silver Queen claim group	[Opal] NBMG Bull 78 Geology and Mineral ...
Eureka County Beowawe Mining District ⓘ Beowawe Hot Springs	[Opal] USGS Bull 1998 +1 other reference
Carlin Trend Maggie Creek Mining Subdistrict ⓘ Gold Quarry Mine	[Opal] Newmont Mining Corporation
Grass Valley ⓘ Walti Hot Springs	[Opal] Castor et al. (2004)
ⓘ Goldstrike Mines	[Opal, Opal-AN] Barrick Gold Corporation
Humboldt County ⓘ Allied Group Nos. 1-22	[Opal] - (2005)
Awakening Mining District ⓘ Sleeper mine	[Opal] USGS Bull 2090 +4 other references
ⓘ Badger Flats	[Opal] Mustoe (2025)
Donnelly Mining District ⓘ Hoss opal mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
ⓘ Little Joe opal mine (Black Rock mine; Little Jo mine)	[Opal, Opal var: Precious Opal] Castor et al. (2004)
ⓘ Royal Rainbow Mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
McDermitt Caldera Center ⓘ Thacker Pass deposit	[Opal, Opal var: Opaline] Castor +1 other reference
Montana Mountains Disaster Mining District ⓘ Disaster Peak property (Nevada Cinnabar Group; Bretchell Mercury Deposit)	[Opal] - (2005)
ⓘ Old Man Spring Prospect	[Opal] - (2005)
National Mining District ⓘ Buckskin Mountain	[Opal] Vikre (1985)
ⓘ Buckskin National mine	[Opal] - (2005)
Opalite Mining District ⓘ Cordero Mine	[Opal] - (2005)
ⓘ McDermitt Mine	[Opal, Opal-AN var: Hyalite] NBMG Bull 59 Geology and Mineral ...
Osgood Mountains Potosi Mining District ⓘ Redhouse Barite Mine	[Opal] Williams (1979)
Rabbit Hole Mining District ⓘ Humboldt Sulphur Company Mine	[Opal] Adams
ⓘ Rabbit Hole Sulfur Mine	[Opal] Adams
Santa Rosa Range ⓘ Firestone Opal Mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
Sulphur Mining District ⓘ Peterson Pit	[Opal] - (2005)
Sulphur ⓘ Hycroft Mine	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Lewis pit	[Opal] Castor et al. (2004)
ⓘ Virgin Valley	[Opal, Opal var: Bone Opal, Opal var: Common Opal, Opal var: Fire Opal, Opal var: Honey Opal, Opal var: Hydrophane, Opal var: Jelly Opal, Opal var: Milk Opal, Precious Opal var: Black Opal, Precious Opal var: Crystal Opal, Precious Opal var: Lechosos Opal] NBMG files No. 50600003 +3 other references
ⓘ April Fool group	[Opal] USGS Bull 1538D
ⓘ Becky-Mucket claims	[Opal, Opal var: Precious Opal] USGS Bull 1538D +1 other reference
ⓘ Black Hope group	[Opal, Opal var: Precious Opal] Christopher Wentzell +1 other reference
ⓘ Black Peacock Mine (Birdlebough Mine; Royal Peacock Black No. 1 & No. 2 lodes)	[Opal, Opal var: Precious Opal] Eckert (1997)
ⓘ Bonanza Opal Mine (Virgin Mine; Virgin Opal Mine; Bon 1-5 lodes; Defiance Mine; Mathewson-Dow Opal Mine)	[Opal, Opal var: Precious Opal] USGS Bull 1538D +1 other reference
ⓘ Cloud Nine Opal Mine (WRT Cloud Nine claim; BLM-NMC#865658)	[Opal, Opal var: Precious Opal] Christopher Wentzell collection.
ⓘ Eddy group	[Opal, Opal var: Precious Opal] USGS Bull 1538D
ⓘ Green Fire Mine	[Opal, Opal var: Precious Opal] Christopher Wentzell
ⓘ Jo Lu 55 Opal Mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
ⓘ Lemon Meringue Mine	[Opal, Opal var: Jelly Opal] Extra Lapis - English No. 10 Opal +1 other reference
ⓘ Opal Queen group	[Opal, Opal var: Precious Opal] USGS Bull 1538D +1 other reference
ⓘ Rainbow Ridge Mine (Monarch Opal Mine; Roop Mine)	[Opal, Opal var: Precious Opal] USGS Bull 1538D +1 other reference
ⓘ Rincon Belle Extension	[Opal, Opal var: Precious Opal] Keith Hodson (1994)
ⓘ Royal Peacock Group Mines	[Opal, Fire Opal var: Precious Fire Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] USGS Bull 1538D +1 other reference
ⓘ Swordfish Mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
ⓘ Toni Fire Opal Mine (Kaleidoscope Fire Opal)	[Opal, Opal var: Precious Opal] Christopher Wentzell
ⓘ Unnamed Opal prospect	[Opal] Castor et al. (2004)
WRT Stonetree group ("Dominion Opal Mine") ⓘ Black Beauty Opal Mine (WRT Black Beauty claim; BLM-NMC No. 865656)	[Opal, Opal var: Precious Opal, Precious Opal var: Black Opal] Christopher Wentzell collection.
ⓘ Stonetree Opal Mine (WRT Stonetree claim; BLM-NMC No. 865655)	[Opal, Opal var: Precious Opal] Sinkankas (1959)
ⓘ WRT Fiddles & Diddles Opal claim	[Opal, Opal var: Precious Opal] Christopher Wentzell +1 other reference
ⓘ WRT Fiery Embers claim	[Opal, Opal var: Precious Opal] Christopher N. Wentzell
ⓘ WRT Sacred Fire claim	[Opal, Opal var: Precious Opal] various contributors (2013)
Virgin Valley Mining District ⓘ Kelley Mine	[Opal] - (2005)
ⓘ Meyer Group Mine	[Opal] - (2005)
Lander County Battle Mountain Mining District ⓘ Elephant Head area	[Opal] USGS Bull 2009
Birch Creek Mining District ⓘ Lowboy mine	[Opal] Nevada Bureau of Mines and Geology ... +1 other reference
ⓘ Daisy Creek (Dacie Creek)	[Opal] Page et al. (1956) +2 other references
ⓘ Izenhood Mining District	[Opal] Fries
ⓘ Mayflower claim (East Shaft)	[Opal] Stewart et al. (1977)
ⓘ Modoc No. 6 claim (West Shaft)	[Opal] Stewart et al. (1977) +1 other reference
ⓘ McCoy Mining District	[Opal] Stewart et al. (1977)
ⓘ McCoy-Strong	[Opal] - (2005)
ⓘ Peacock-Eckman	[Opal] - (2005)
Reese River Mining District ⓘ Apex Mine (Rundberg Mine; Early Day Mine)	[Opal] Jensen et al. (2012)
ⓘ Rock Creek Property	[Opal] - (2005)
Spencer Hot Springs Mining District ⓘ Linka Mine	[Opal, Opal-AN, Opal-AN var: Hyalite] Luetcke (n.d.)
Lincoln County Chief Mining District ⓘ Lucky Chief mine	[Opal] NBMG Bull 73 Geology and Mineral ... +1 other reference
Mormon Mountains Mormon Mountains District ⓘ Webber Mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
ⓘ Panaca Mining District	[Opal] Page et al. (1956) +2 other references
ⓘ Morgan and Bush mine	[Opal] - (2005)
Lyon County ⓘ Fernley	[Opal] USGS Minerals Yearbook - Diatomite 1998
ⓘ Southwest	[Opal] Castor et al. (2004)
Ramsey Mining District ⓘ DeLongchamps prospect	[Opal] - (2005)
Singatse Range Yerington Mining District ⓘ Carson Hill	[Opal] Castor et al. (2004)
Ludwig ⓘ Ludwig Mine	[Opal] Castor et al. (2004)
Talapoosa Mining District ⓘ Talapoosa mine	[Opal] - (2005)
Mineral County ⓘ Fishlake Valley	[Opal] King (n.d.)
Fitting Mining District ⓘ Gillis prospect (Gillis Iron Nos. 1 & 2 claims)	[Opal] Ross (1961) +1 other reference
Rawhide Mining District ⓘ Stockton Property	[Opal] Ross (1961)
Red Ridge Mining District ⓘ Bubbles group	[Opal] Castor et al. (2004)
ⓘ Robinson group	[Opal] Castor et al. (2004)
Toquima Range Barcelona Mining District (Spanish Belt Mining District) ⓘ Lucky Ann	[Opal] - (2005)
Nye County Bare Mountain ⓘ Bare Mountain Mining District (Fluorine Mining District)	[Opal] Lavinsky (n.d.)
Beatty ⓘ Harvey Mine (Telluride Mine)	[Opal] NBMG Bull 77 Geology and Mineral ...
ⓘ Meiklejohn Mountain	[Opal] Palache et al. (1951)
ⓘ BVC Claims	[Opal] - (2005)
ⓘ Cinnabar prospect	[Opal] USGS Bull 620D
ⓘ Hogback Ridge	[Opal] Castor et al. (2004)
ⓘ Mammoth group Nos. 1-3	[Opal] USGS Bull 620D
ⓘ Mammoth No. 5 prospect	[Opal] USGS Bull 620D
ⓘ Thompson Mine	[Opal] NBMG Bull 77 Geology and Mineral ... +1 other reference
ⓘ Tip Top Mine	[Opal] NBMG Bull 77 Geology and Mineral ...
ⓘ Wright Prospect	[Opal] - (2005)
Gabbs Mining District ⓘ Gabbs	[Opal, Opal var: Opal-CT] Mustoe (2025)
ⓘ Opaline silica quarry of Basic Inc.	[Opal] Castor et al. (2004)
Jackson Mining District ⓘ Warcloud Mine	[Opal] Castor et al. (2004)
Paradise Peak Mining District ⓘ Ketchup Flat deposit	[Opal] Sillitoe et al. (1994)
San Antonio Mountains ⓘ Tonopah Mining District	[Opal] Page et al. (1956) +2 other references
Tonopah ⓘ Mizpah Mine (Mizpah shaft)	[Opal, Opal-AN] Castor et al. (2004)
ⓘ Tonopah Mining Company	[Opal] - (2005)
ⓘ Valley View vein	[Opal, Opal-AN] Castor et al. (2004)
ⓘ Starfire Opal mine	[Opal, Opal var: Precious Opal] Castor et al. (2004)
Toquima Range Manhattan Mining District Manhattan ⓘ Manhattan Consolidated Mine	[Opal] Castor et al. (2004)
ⓘ Train prospect	[Opal] Castor et al. (2004)
Northumberland Mining District ⓘ Northumberland Mine	[Opal] MinRec 16 (1)
ⓘ Yucca Mountain	[Opal] Nevada Bureau of Mines and Geology NBMG ... +1 other reference
Pershing County Antelope Mining District Lovelock ⓘ Unnamed Zeolite deposit [1]	[Opal] USGS Minerals Yearbook - Diatomite 1998
Antelope Springs Mining District ⓘ Red Bird Mine	[Opal, Opal-AN] Castor et al. (2004)
ⓘ Black Dyke Claim	[Opal] - (2005)
Buena Vista Valley ⓘ Kyle Hot Springs	[Opal] Castor et al. (2004)
Farrell Mining District ⓘ Unnamed Locality	[Opal, Opal-AN var: Hyalite] Walstrom (n.d.)
ⓘ Goldbanks Mining District	[Opal] Castor et al. (2004)
ⓘ Goldbanks mine	[Opal] - (2005)
Imlay Mining District ⓘ Florida Canyon mine	[Opal] - (2005)
ⓘ Jersey Mining District (Jersey Valley Mining District)	[Opal] Castor et al. (2004)
ⓘ Mercury-Silicon Mine	[Opal] - (2005)
Nightingale Mining District ⓘ Sage Hen Springs Prospect	[Opal, Opal-AN] Larry J (1973)
Shoshone Mountains ⓘ Mule Canyon deposit	[Opal] Part 1 +1 other reference
Storey County Castle Peak Mining District ⓘ Washington Hill mine	[Opal] NBMG Bull 70 Geology and Mineral ...
ⓘ Comstock Mining District	[Opal] Castor et al. (2004)
Washoe County ⓘ Lost Creek	[Opal] Castor et al. (2004)
ⓘ Mahogany Peak	[Opal] Castor et al. (2004)
ⓘ Orion Group (Gillam; Boar; Ymer)	[Opal] - (2005)
Pyramid Lake ⓘ Needle Rocks	[Opal] Castor et al. (2004)
Pyramid Mining District ⓘ Lowary mine (Maue-Mcray mine)	[Opal] NBMG Bull 70 Geology and Mineral ...
ⓘ Red Bluff mine	[Opal] NBMG Bull 70 Geology and Mineral ... +3 other references
San Emidio Mining District ⓘ San Emidio prospect (Mud Flat prospect)	[Opal] NBMG Bull 70 Geology and Mineral ... +1 other reference
ⓘ Wind Mountain Mine	[Opal] - (2005)
ⓘ Steamboat Springs Mining District	[Opal] MinRec 16 (1)
ⓘ Faith clay pit	[Opal] Castor et al. (2004)
ⓘ Steamboat Hot Springs	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Steamboat Springs mine (silica pit)	[Opal] NBMG Bull 70 Geology and Mineral ...
ⓘ Unnamed prospect (MRDS10295921)	[Opal] - (2005)
ⓘ Wall Canyon	[Opal] Castor et al. (2004)
White Pine County ⓘ Currant Mining District	[Opal] Castor et al. (2004)
White Pine Mining District ⓘ Griffon Mine	[Opal] - (2005)
ⓘ Nighthawk Ridge mine	[Opal] - (2005)
ⓘ Pan Mine	[Opal] - (2005)
New Hampshire Carroll County Albany ⓘ Government pit	[Opal, Opal-AN] Rocks & Min. 80:243
Conway ⓘ Lovejoy Gravel pits	[Opal, Opal-AN]
Hale's Location ⓘ Middle Moat Mountain locality	[Opal, Opal-AN] P Cristofono collection 2010
ⓘ Ossipee	[Opal, Opal-AN] Smith (2005)
ⓘ Gulch locality	[Opal, Opal-AN]
Wakefield ⓘ Ham and Weeks Mine	[Opal, Opal-AN var: Hyalite] P. Cristofono collection (ex. Gene Bearss)
Cheshire County Marlow ⓘ Turner Mine	[Opal, Opal-AN] P. Cristofono collection
Surry ⓘ Mine Ledge	[Opal] King (n.d.)
ⓘ Walpole	[Opal] King (n.d.)
ⓘ Chickering Mine	[Opal, Opal-AN] P. Cristofono et al. (2011)
Grafton County Bethlehem ⓘ North Sugarloaf Mountain locality	[Opal] Rocks & Minerals Vol.65 No.4 +1 other reference
Groton ⓘ Palermo No. 1 Mine	[Opal, Opal-AN] Whitmore et al. (2004)
Orange ⓘ Keyes Mica Quarries	[Opal, Opal-AN var: Hyalite] Thompson et al. (2022)
Hillsborough County ⓘ Bedford	[Opal, Opal-AN] P. Cristofono collection
ⓘ Pulpit Road locality	[Opal, Opal-AN] Cristofono (n.d.)
ⓘ Merrimack	[Opal, Opal-AN] Cristofono (n.d.) +1 other reference
ⓘ Route 101A construction site	[Opal, Opal-AN] Cristofono (n.d.)
Wilton ⓘ Wilton Crushed Stone Quarry	[Opal, Opal-AN] Cristofono (n.d.)
Merrimack County Hooksett ⓘ Hooksett Crushed Stone Quarry	[Opal, Opal-AN] P. Cristofono collection
Rockingham County Fremont ⓘ Route 107 area	[Opal, Opal-AN] P Cristofono collection
ⓘ Raymond	[Opal, Opal-AN] P. Cristofono collection
Salem ⓘ Foster Corners	[Opal, Opal-AN] P. Cristofono collection
Windham ⓘ Ledge Road	[Opal, Opal-AN] P Cristofono collection 2010
Strafford County Strafford ⓘ Parker Mountain Mine	[Opal, Opal-AN] Rocks & Min.:64:504. +1 other reference
Sullivan County Acworth South Acworth ⓘ Beryl Mountain Quarry	[Opal, Opal-AN] Jeremy Zolan Collection
Springfield ⓘ Colby Mine	[Opal, Opal-AN var: Hyalite] P. Cristofono collection
ⓘ New Jersey	[Amber] Mason (1976)
Burlington County Southampton Township ⓘ Vincentown	[Amber] Kunz (1890)
Camden County ⓘ Camden	[Amber] D. M. Schlegal (1959)
Essex County Montclair Upper Montclair ⓘ McDowell's Quarry (Osborne and Marsellis Quarry)	[Opal] Mins. of NYC & Its Environs (1931) +1 other reference
Verona ⓘ F.J. Marley Quarry	[Opal, Opal-AN] Manchester (1931)
Gloucester County South Harrison Township Harrisonville ⓘ Old Man's Creek	[Amber] Kunz (1890)
Hudson County Bergen Hill Weehawken ⓘ New York - West Shore & Buffalo RR tunnel	[Opal, Opal-AN] Canfield (1889) +1 other reference
Jersey City Bergen Hill Mt Pleasant ⓘ Pennsylvania Railroad cut	[Opal, Opal-AN, Opal var: Fire Opal, Opal var: Hydrophane] Mins. of NYC & Its Environs et al. (1931)
Mercer County Hamilton Township ⓘ Crosswicks Creek	[Amber] D. M. Schlegal (1959) +1 other reference
West Windsor Township ⓘ Margerum Brothers Quarry	[Opal, Opal-AN] Manchester (1931)
Middlesex County ⓘ Dunellen	[Opal] The Minerals of NYC & Its Environs et al. (1931)
New Brunswick ⓘ Burnt Woods	[Amber] The Minerals of NYC & Its Environs et al. (1931)
ⓘ Sayreville	[Amber] A Quest for New Jersey Minerals (1978)
ⓘ South Amboy Borough	[Amber] Manchester (1931)
ⓘ South River Borough	[Amber] Manchester (1931)
Monmouth County Belmar (Belmar Borough) ⓘ Shark River	[Amber] Manchester (1931) +1 other reference
Morris County Mine Hill ⓘ Dickerson Mine	[Opal, Opal var: Isopyre] Canfield (1898) +1 other reference
Netcong ⓘ Lowrance Mine	[Opal, Opal-AN] NJ State Geol. Ann. Rpt. (1856)
Rockaway Township ⓘ Allen Mine	[Opal] NJ State Geol. Ann. Rpt (1856) +1 other reference
Passaic County Little Falls Township Great Notch ⓘ Francisco Brothers Quarry	[Opal] Mins. of NYC & Environs (1931)
Paterson ⓘ Upper New Street Quarry	[Opal, Opal-AN] American Muiseum of Nat. History et al. (s) +2 other references
Salem County Pennsville Township ⓘ Harrisonville (Pigseye; Pigs Eye)	[Amber] D. M. Schlegal (1959)
Somerset County Bernards Township ⓘ Millington Quarry	[Opal] Kent et al. (2000)
Bridgewater Township ⓘ Chimney Rock Quarry	[Opal]
Warren Township ⓘ Stirling Brook ("Carnelian Creek")	[Opal] Speiser (1978)
Sussex County Byram Township Cranberry Lake ⓘ BEMCO prospect (Charlotte Mine)	[Opal, Opal-AN] collected by David Bernstein- 10/2009
Franklin Franklin Mine ⓘ Buckwheat dump mineral collecting site	[Opal] King
Ogdensburg ⓘ Sterling Hill	[Opal] Kuitems et al. (2009)
Union County ⓘ Summit	[Opal] Manchester (1931)
Warren County Franklin Township ⓘ New Village	[Opal] Yale Peabody Museum 3979
ⓘ Hackettstown	[Opal] Manchester (1931)
New Mexico Bernalillo County ⓘ Isleta Pueblo	[Opal] Northrop et al. (1996)
ⓘ Carlsbad Potash District	[Opal] Northrop et al. (1996)
Catron County ⓘ Taylor Creek Mining District	[Opal] Northrop et al. (1996)
ⓘ Juniper locality	[Opal] NMGS 37th Field Conference
ⓘ Nugget Gulch	[Opal] NMGS 37th Field Conference
Sawmill Creek ⓘ Unnamed prospects	[Opal] NMGS 37th Field Conference
Cibola County Laguna subdistrict ⓘ Woodrow Mine (Woodrow breccia pipe)	[Opal] NMBMMR Memoir 15 Geology and Technology ... +2 other references
Colfax County Springer Point of Rocks Mesa ⓘ Point of Rocks Quarry	[Opal, Opal-AN] Northrop et al. (1996)
Doña Ana County Rincon Mining District ⓘ Palm Park	[Opal] Northrop et al. (1996)
Grant County ⓘ Alum Mountain Mining District (Alum Mining District)	[Opal] Northrop et al. (1996)
ⓘ Black Canyon	[Opal] Northrop et al. (1996)
ⓘ Burro Mountains Mining District	[Opal] Northrop et al. (1996)
Tyrone Area ⓘ Porterfield Mine	[Opal] Gillerman (1964)
Cap Rock Mountain Mining District ⓘ Cliff Roy Mine	[Opal] Gillerman (1964) +1 other reference
ⓘ Central Mining District (Bayard District)	[Opal] Northrop et al. (1996)
ⓘ Fort Bayard	[Opal, Opal var: Precious Opal] Northrop et al. (1996) +1 other reference
ⓘ Sweeny Mine	[Opal] Walstrom (n.d.)
ⓘ Faywood Hot Springs	[Opal] Northrop et al. (1996)
Pinos Altos Mining District ⓘ Cross Mountain Road	[Opal, Opal-AN] Identified on specimens obtained at ...
ⓘ Santa Rita Mining District	[Opal, Opal var: Fire Opal, Opal var: Precious Opal] Northrop et al. (1996)
White Signal Mining District ⓘ Merry Widow Mine	[Opal, Opal-AN] Northrop et al. (1996)
ⓘ Tullock Shaft	[Opal] Gillerman (1964)
Hidalgo County ⓘ Antelope Wells prospect	[Opal, Opal-AN] Page et al. (1956) +3 other references
ⓘ Hatchet Mountains	[Opal] Northrop et al. (1996)
ⓘ Peloncillo Hills	[Opal] Northrop et al. (1996)
Peloncillo Mountains San Simon Mining District ⓘ Copper Queen claim	[Opal] Lindgren et al. (1910)
Granite Gap ⓘ Bob Montgomery Claim Group	[Opal] Walstrom (n.d.)
ⓘ Stella Maris No. 1 Mine	[Opal] - (2005)
Pyramid Mountains Lordsburg Mining District Lordsburg Virginia District ⓘ Atwood-Henry Clay Mine (Alamo Mine)	[Opal] Walstrom (n.d.)
ⓘ Pole Line prospect	[Opal] Walstrom (n.d.)
Lea County Lovington ⓘ Unspecified occurrences	[Opal, Opal-AN] Northrop et al. (1996)
Lincoln County Red Cloud District ⓘ Red Cloud copper mine	[Opal, Opal-AN var: Hyalite] Steve Sorrell Collection
Luna County ⓘ Deming	[Opal] Luetcke (n.d.)
Little Florida Mountains Little Florida Mountains Mining District ⓘ Rockhound State Park	[Opal] www.emnrd.state.nm.us (1997)
Tres Hermanas Mountains Tres Hermanas Mining District Mahoney Mines area ⓘ Cincinnati vein system	[Opal, Opal-AN] Jerry Cone Collection
ⓘ Comfort claim	[Opal] Jerry Cone Collection +1 other reference
ⓘ Lindy Ann claims	[Opal] Jerry Cone Collection
McKinley County ⓘ Gallup Mining District	[Opal] Northrop et al. (1996)
Otero County Cornudas Mountains ⓘ Wind Mountain	[Opal] Laszlo Horvath collection
Rio Arriba County ⓘ Petaca Mining District	[Opal] Northrop et al. (1996)
San Juan County ⓘ Chuska Mountains	[Opal] Northrop et al. (1996)
San Juan Basin ⓘ Fossil Forest	[Amber] Combining Science and Education. Maps ... +1 other reference
Sandoval County ⓘ Cochiti District	[Opal, Opal var: Precious Opal] Elston (1968)
ⓘ Jemez Mountains	[Opal, Opal-AN var: Hyalite] Pat R Gould Jr. Collection
ⓘ Jemez Sulfur District	[Opal] Northrop et al. (1996)
ⓘ Battleship Rock	[Opal, Opal-AN] Northrop et al. (1996)
ⓘ Rio Puerco area	[Opal] Northrop et al. (1996)
Santa Fe County ⓘ Cerrillos District	[Opal] Elston (1968)
ⓘ Tom Payne Mine (Tom Paine mine)	[Opal] - (2005)
ⓘ La Bajada Mining District	[Opal] Northrop et al. (1996)
ⓘ New Placers District	[Opal] Northrop et al. (1996)
ⓘ Carnahan Mine (Lincoln-Lucky Mine)	[Opal, Opal-AN] Northrop et al. (1996)
ⓘ San Pedro Mine	[Opal] NMBMMR New Mexico Mineral symposium (2004)
Sierra County ⓘ Black Range	[Opal] Maxwell et al. (1986)
Caballo Mountains Mining District ⓘ Napolean - Rosa Lee prospect	[Opal] Jerry Cone Collection
Hillsboro Mining District Hillsboro Percha Creek ⓘ Big Chief Mine	[Opal, Opal-AN] Luetcke (n.d.)
ⓘ Rex mine (Rex and Smuggler mine)	[Opal] Jerry Cone Collection
ⓘ Iron Mountain No. 2 District	[Opal] USGS Bull 945C +1 other reference
ⓘ New Mexico Highway 1 roadcut	[Opal, Opal-AN] Gibbs (2013)
ⓘ Nugget Gulch	[Opal, Opal-AN] Northrop et al. (1996)
ⓘ Nunns Lease	[Opal] - (2005)
Paramount Canyon ⓘ Beryllium Virgin claim	[Opal, Opal-AN] Northrop et al. (1996)
Rio Grande Rift Zone ⓘ Jornada Del Muerto	[Opal] - (2005)
ⓘ San Mateo Mountains Mining District	[Opal] Northrop et al. (1996)
ⓘ Monticello deposit (Pitchblende Strike prospect)	[Opal, Opal-AN] Northrop et al. (1996)
ⓘ Terry Uranium Prospect	[Opal] NMBMMR OFR 19
ⓘ Taylor Creek Tin Mining District (Black Range Tin District)	[Opal] Northrop et al. (1996)
ⓘ The Clearing	[Opal, Opal-AN] Northrop et al. (1996)
Socorro County ⓘ Bernardo Bridge	[Opal] Northrop et al. (1996)
ⓘ Hansonburg District	[Opal] Northrop et al. (1996)
ⓘ Jornada Draw	[Opal, Opal var: Moss Opal] The Mineralogist
ⓘ Ladron Mountains Mining District	[Opal] Northrop et al. (1996)
ⓘ Luis Lopez Manganese District	[Opal] Northrop et al. (1996)
ⓘ Magdalena Mining District	[Opal] Northrop et al. (1996)
ⓘ North Magdalena Mining District	[Opal] Jerry Cone Collection
Socorro Peak Mining District ⓘ May Flower Mine	[Opal, Opal-AN] Variety hyalite
ⓘ Socorro Hot Springs	[Opal] Northrop et al. (1996)
Taos County No Agua Mining District ⓘ Brushy Mountain	[Opal] Ramon DeMark and Jessie Kline
ⓘ United Perlite Mine	[Opal] NMBMMR New Mexico Mineral symposium (2000)
ⓘ Union County	[Opal] Northrop et al. (1996)
ⓘ New York	[Amber, Opal, Opal-AN] Manchester (1931) +1 other reference
Broome County Deposit ⓘ Wheeler Quarry	[Opal, Opal-AN] Rocks & Min.: 20:61.
Essex County Crown Point Township ⓘ Crown Point Center	[Opal, Opal-AN] Jensen (1978)
ⓘ New York City	[Opal] John H. Betts (2009)
Manhattan (New York County) ⓘ 106th Street & Central Park West	[Opal, Opal-AN] Alfredo Petrov
Staten Island (Richmond County) ⓘ Kreischerville	[Amber] Manchester (1931) +1 other reference
Orange County Town of Warwick Amity ⓘ Rhein Property	[Opal] Glenn Rhein
Edenville Edenite Hill ⓘ Pipeline Excavation	[Opal, Opal-AN] King (n.d.)
Putnam County Town of Philipstown ⓘ Philips Mine (Philips Pyrite Mine; Anthony's Nose Pyrrhotite Mine)	[Opal, Opal-AN] Rocks & Min.:8:61-65.
Town of Putnam Valley ⓘ Phillips ore bed	[Opal, Opal-AN] Manchester (1931)
Town of Southeast ⓘ Interstate 84 road cuts	[Opal, Opal-AN] Januzzi
ⓘ Tilly Foster Iron Mine	[Opal] - (Januzzi, 1966, 1989) +1 other reference
St. Lawrence County De Kalb Bigelow ⓘ Road cut	[Opal] Rocks & Minerals 85:250-259
Westchester County ⓘ Bedford	[Opal, Opal-AN] Manchester (1931)
ⓘ Baylis Quarry (Bayliss Quarry)	[Opal, Opal-AN] Rocks & Min.:11:66 +1 other reference
ⓘ Consolidated Feldspar Mining Corporation's plant	[Opal, Opal-AN] Manchester (1931)
Cortlandt Township Montrose ⓘ Crugers Emery Mine	[Opal] Rocks & Min.:8:39.
Toddville ⓘ Strang Emery Pit	[Opal, Opal-AN] Rocks & Min.: 7:91 +1 other reference
Harrison ⓘ Lake Street Quarry	[Opal, Opal-AN] Rocks & Min.: 6:101 & 9:136-137.
Peekskill Camp Smith ⓘ McCoy's Gold Mine	[Opal, Opal-AN] Rocks & Min.: 8:40.
ⓘ Croft Mine (Croft Magnetic Iron Mine)	[Opal, Opal-AN] Rocks & Min.:7:148 & 8:40.
ⓘ White Plains	[Opal, Opal-AN] Manchester (1931)
North Carolina ⓘ Ashe County	[Opal, Opal-AN] Genth (1891) +1 other reference
Beaufort County North Carolina Phosphate Mining District Aurora ⓘ Texas Gulf Sulphur Phosphate Quarry	[Amber] Sinkankas (1976)
ⓘ Brunswick County	[Amber] World of Amber
Cabarrus County Charlotte Belt ⓘ Propst Mine (Nash; Heglar)	[Opal] Carpenter (1976)
ⓘ Concord	[Opal, Opal-AN] Pratt (1933)
Caldwell County ⓘ Wilson Creek	[Opal] Luke Osborne states that he collected ...
Clay County ⓘ Elf	[Opal, Opal-AN] Pratt (1933)
Cleveland County Kings Mountain ⓘ Foote Lithium Co. Mine	[Opal] Collections of Kenny Gay and Steve Adams
Cumberland County Fayetteville ⓘ Cape Fear River Formation	[Opal] Ransom (1974)
Macon County Cowee Valley Ellijay Mining District Franklin Corundum Hill ⓘ Culsagee Mine	[Opal, Opal-AN] Ref.: Dana 6:499
Madison County Mars Hill ⓘ Carter Mine	[Opal, Opal-AN] Rocks & Min.: 17:62
Mitchell County Cane Creek Section Bakersville Pizzle Mtn ⓘ Cloudland Mine	[Opal, Opal-AN] Rocks & Min.:11:76-77.
Crabtree Creek ⓘ Bon Ami Mine	[Opal, Opal-AN] Veal (2004)
ⓘ Glenn Mine	[Opal, Opal-AN] Smithsonian Institution Mineral ...
Crabtree Falls Crabtree Mountain ⓘ Ballew Mine	[Opal, Opal-AN] Rocks & Min.:11:58.
Grassy Creek ⓘ Grassy Creek Mine	[Opal, Opal-AN] Genth et al. (1881)
Hawk-Bakersville ⓘ Carter Buchanan Mica Mine	[Opal, Opal-AN] - (2005)
ⓘ W. C. Burleson Mica Mine (Joe Stevenson Mine)	[Opal, Opal-AN] - (2005)
ⓘ Laster Mine	[Opal, Opal-AN] Rocks & Min.: 11:58.
ⓘ Lick Ridge Mine	[Opal, Opal-AN] Genth (1891)
Little Switzerland ⓘ Hollifield Mine	[Opal, Opal-AN] Rocks & Min.:11:58.
ⓘ Pittman Mine	[Opal, Opal-AN] Rocks & Min.: 11:57.
Penland ⓘ Deer Park Mine	[Opal, Opal-AN] Streeter (2003)
ⓘ Deer Park No. 2 Mine	[Opal, Opal-AN] Rocks & Min.:11:77 & 60:92.
ⓘ Pine Mountain (Pine Mountain Mine)	[Opal, Opal-AN] U.S Bureau of Mines (Mas/Mils)
Spruce Pine ⓘ Big Crabtree road	[Opal, Opal-AN] Schrader et al. (1979)
ⓘ Chalk Mountain Mine	[Opal, Opal-AN] Streeter (2003)
ⓘ Lawson Mine	[Opal, Opal-AN] Schrader et al. (1979)
ⓘ McKinney Mine (Power Mill Creek Mine)	[Opal, Opal-AN] Ross (1937)
ⓘ Southers Branch Mine (Sullins Branch Mine)	[Opal, Opal-AN] Rocks & Min.: 60:92.
ⓘ Sullins Branch mine	[Opal, Opal-AN] Schrader et al. (1979)
ⓘ Pitt County	[Amber] Genth (1891) +1 other reference
ⓘ Stokes County	[Opal, Opal-AN] Genth (1891)
Swain County Bryson City Feldspar Mining District ⓘ Bryson Branch Gold Placers	[Opal] - (2005)
ⓘ Vance County	[Opal, Opal-AN]
Hamme Tungsten Mining District Tungsten ⓘ Tungsten Queen Mine and plant	[Opal, Opal-AN] Ransom (1974)
ⓘ Wayne County	[Amber] World of Amber
Yancey County Burnsville Hurricane Mountain ⓘ Ray Mica Mine	[Opal, Opal-AN] C.W. Allen collection
Celo Micaville ⓘ Fanny Gouge Mine	[Opal, Opal-AN] C.W. Allen collection
Crabtree Creek ⓘ Carolina Mineral Company No. 20 Mine (Old 20 Mine)	[Opal, Opal-AN] Rocks and Minerals (1985) +1 other reference
Seven Mile Ridge ⓘ Huskins Mine	[Opal, Opal-AN] Rocks & Min.:11:58.
Ohio Franklin County ⓘ American Aggregates Corp. Marble Cliff Quarry	[Opal] Carlson (2015)
Columbus ⓘ Bill Moose Run	[Opal] John Krygier specimens
Oklahoma Kiowa County Lugert ⓘ Government quarry (Lugert granite quarry)	[Opal, Opal-AN] R&M 72:4 pp 252-264
ⓘ Murray County	[Opal] Rocks & Min. vol. 72 (1997)
ⓘ Ottawa County	[Opal] Dake
Oregon Baker County Conner Creek Mining District ⓘ Connor Creek Prospect	[Opal] - (2005)
ⓘ Durkee	[Opal] MacFall (1951)
ⓘ Durkee Fire Opal Mine	[Opal, Opal var: Fire Opal] Tschernich (1992)
Swayze Creek ⓘ Durkee Opal Mine	[Opal] Micro Probe Volume VI Number 4
Clackamas County Clackamas River localities ⓘ Memaloose roadcut	[Opal] Bill Thompkins
Oak Grove Fork ⓘ Kiggins Mine	[Opal] - (2005)
ⓘ Nisbet (Oregon Quicksilver)	[Opal] - (2005)
Columbia County Goble ⓘ Neer Road	[Opal] Micro Probe Vol. 6 No. 5 Fall 1987 +1 other reference
Crook County Howard Mining District (Ochoco Mining District; Bolivar Mining District) ⓘ Barnes Butte (Prineville Quicksilver)	[Opal] - (2005)
ⓘ Jimmy Ann (Beardssmore; Stanley & Culbertson; Staley; Ochoco Mines Corp.; Ochoco Quicksilver Champion; Barney and Staley)	[Opal] - (2005)
ⓘ Mother Lode (American Almaden; Consolidated Quicksilver; Canyon Creek)	[Opal] - (2005)
ⓘ Post	[Opal]
Deschutes County Newberry National Volcanic Monument ⓘ Newberry Caldera	[Opal] Mineralogy of 10 Geothermal boreholes ...
Harney County ⓘ Buchanan Ranch	[Opal] Colburn (2004)
ⓘ Otis Basin Diatomite Occurrence	[Opal] - (2005)
ⓘ Paiute	[Opal] - (2005)
Pueblo Mining District (Denio Mining District) ⓘ Blair Group (Connor - Blair)	[Opal] - (2005)
ⓘ Blue Bull Occurrence (Ionic Claims; Chukar Group)	[Opal] - (2005)
ⓘ Double Link Occurrence	[Opal] - (2005)
ⓘ Fisher (Fisher & Regal & Sheepherder Claims; Fisher and Regal Group; Doan Group)	[Opal] - (2005)
ⓘ Harmony Occurrence (Surprise Group; Ajax Claims)	[Opal] - (2005)
ⓘ Mogul	[Opal] - (2005)
Hood River County ⓘ Pucci drillhole	[Opal] Marshall W. Gannett and Keith E. Bargar +1 other reference
Jackson County Ashland Mining District ⓘ Climax Gold Area Occurrence (Gypsum Occurrence)	[Opal] - (2005)
ⓘ Meridian Prospect (Phillips Property)	[Opal] - (2005)
Butte Creek Mining District ⓘ Call of the Wild prospect (Grand Cove prospect)	[Opal] - (1943)
Evans Creek Mining District ⓘ Chisholm Claims (Shamrock Mine; Mrs. Dewey; Little Jean)	[Opal] - (2005)
Meadows Mining District ⓘ Chisholm (Shamrock Mine; Mrs. Dewey; Little Jean)	[Opal] - (2005)
Jefferson County Madras ⓘ Richardson Ranch	[Opal, Opal-AN] K. Volkman personal collection
ⓘ Polka Dot Agate mine	[Opal] Occurs inside the Thunder Eggs
Pony Butte ⓘ Thunderegg Deposit	[Opal] Colburn (2004)
ⓘ Round Butte Cinder Pit	[Opal, Opal-AN var: Hyalite] Aidan Cerenzie Collection
Klamath County ⓘ Oregon Technical Institute Occurrence	[Opal] - (2005)
ⓘ Summit Rock	[Opal, Opal-AN] Kleck (1970)
Lake County Christmas Valley ⓘ Christmas Valley pit	[Opal] MRDS file #10225715.
Glass Buttes ⓘ Cascade Property	[Opal] 174. +1 other reference
ⓘ Glass Buttes Mine	[Opal] 173. +1 other reference
ⓘ Hart Mountain	[Opal, Opal var: Fire Opal, Opal var: Precious Opal] Dake (1956)
ⓘ West Face zeolite occurrence	[Opal, Opal var: Common Opal] Steve Ewens Collection
ⓘ Juniper Ridge Opal Mine	[Opal, Opal var: Fire Opal, Opal var: Moss Opal] Extra Lapis - English No. 10 Opal
Lakeview ⓘ White King Mine	[Opal] R. E. Cohenour (1960)
ⓘ Madera	[Opal] - (2005)
Plush ⓘ Oregon Sunstone public collection area	[Opal, Opal-AN] March. +1 other reference
ⓘ Spectrum Mine	[Opal, Opal-AN] March. +1 other reference
Quartz Mountain ⓘ Quartz Mountain Gold Deposit (Fremont; Quartz Mountain Property)	[Opal] - (2005)
ⓘ School Creek Prospect	[Opal] - (2005)
Lane County Black Butte Mining District ⓘ Hobart Butte	[Opal] From the labelled Byron Weissberg PhD ...
Malheur County ⓘ Brandon Occurrence (Quartz Mtn.; Glassy Butte)	[Opal] - (2005)
Lake Owyhee State Park ⓘ Owyhee Dam	[Opal]
Opalite Mining District (McDermitt Mining District) ⓘ Aurora Uranium Prospect	[Opal] Nevada Bureau of Mines and Geology NBMG ... +1 other reference
ⓘ Rome Zeolite Occurrence	[Opal] - (2005)
ⓘ Sheaville Zeolite Occurrence	[Opal] - (2005)
ⓘ Skull Springs	[Opal] L. Johnson (A Falcon Guide)
ⓘ Snively Hot Spring	[Opal] Jonathan Gladwell Collection
ⓘ Succor Creek	[Opal, Opal var: Fire Opal, Opal var: Opal-CT] Dake (1956)
Marion County Santiam Mining District (Elkhorn Mining District) Breitenbush-Austin Hot Springs area ⓘ Cinnabar Occurrence	[Opal] Bargar et al. (1997) +1 other reference
Morrow County ⓘ Opal Butte	[Opal, Opal-AN, Opal var: Blue Opal, Opal var: Fire Opal, Opal var: Hydrophane, Opal var: Jelly Opal, Opal var: Precious Opal, Opal-AN var: Hyalite, Precious Opal var: Contra Luz Opal, Precious Opal var: Crystal Opal] USGS
Wasco County Deschutes Canyon ⓘ Black Agate Deposit	[Opal] Bill Hamel Collection
ⓘ Tygh Valley	[Opal] This specimen was collected by the Bob Werner et al. (Dec 2009, ch. 10, p. 10-2)
Pennsylvania Adams County Cumberland Township ⓘ Teeter Quarry	[Opal] Rocks & Minerals 81:229-234
Berks County Birdsboro Gibraltar ⓘ Dyer Quarry	[Opal, Opal-AN] The Mineralogy of Pennsylvania 1966-1975 +2 other references
Delaware County Springfield Township ⓘ Leiper's Quarry	[Opal] Rocks & Min.: 59:109-120 & 62:176-178.
Lycoming County Franklin Township ⓘ McCauley prospect 17	[Opal] Smith and Hoff (1984)
Philadelphia County Philadelphia Frankford ⓘ Barber's Quarry	[Opal, Opal-AN] Samuel S. Gordon +1 other reference
ⓘ Peter's Quarry	[Opal, Opal-AN] Samuel S. Gordon +1 other reference
Germantown ⓘ Wayne Junction Quarry	[Opal, Opal-AN] Gordon (1922)
ⓘ Wissahickon Valley	[Opal, Opal-AN] Gordon (1922)
York County ⓘ York	[Opal] Ransom (1974)
Rhode Island Bristol County Barrington ⓘ Bay Spring quarries	[Opal]
Providence County Burrillville Oakland ⓘ State Route 102 road cut	[Opal, Opal-AN] Miller
Cumberland ⓘ Beacon Pole Hill quarry	[Opal] Museum of Natural History
Diamond Hill ⓘ Diamond Hill Granite Company quarry (Catamint Hill quarry; Calumet Hill quarry)	[Opal] Miller (1971)
ⓘ Grants Mills	[Opal, Opal-AN] Gems & Minerals 395 (August, 1970)
ⓘ Iron Mine Hill quarry	[Opal] Miller (1971)
ⓘ Sneech Pond copper mines (Copper Mine Hill)	[Opal, Opal-AN] Eckert (1997)
East Providence ⓘ Ide's Ledge quarry	[Opal]
Johnston ⓘ Interstate 295 / US Route 6 road cuts	[Opal, Opal-AN] George (1972)
Lincoln Lime Rock ⓘ Conklin Quarry	[Opal, Opal-AN var: Hyalite] Carr et al. (1981) +1 other reference
Washington County New Shoreham Block Island ⓘ Black Rock Point	[Amber]
South Carolina Charleston County ⓘ Charleston	[Amber, Amber var: Ambrosine]
ⓘ Fairfield County	[Opal, Opal-AN var: Hyalite] Speer (1987)
ⓘ Kershaw County	[Opal, Opal-AN var: Hyalite] Speer (1987)
ⓘ Lancaster County	[Opal, Opal-AN var: Hyalite] Speer (1987)
South Dakota ⓘ Campbell County	[Opal] Ransom (1974)
ⓘ Corson County	[Opal] Ransom (1974)
Custer County Custer Mining District Fourmile ⓘ Helen Beryl Mine	[Opal, Opal-AN] Rocks & Minerals: 60: 117.
Custer State Park The Needles ⓘ November Mine	[Opal] Smith et al. (2000)
Lawrence County Bald Mountain Mining District (Portland Mining District) Annie Creek ⓘ Davier Mine	[Opal] Smith et al. (2000)
ⓘ Wharf Mine	[Opal, Opal var: Opaline] PEDRAZA ROJAS et al. (2016)
Pennington County Harney City ⓘ Wood Tin mine	[Opal] - (2005)
Keystone Mining District Keystone ⓘ Barker-Ferguson Mine	[Opal] Smith et al. (2000)
ⓘ Etta Mine	[Opal] Rocks & Minerals: 67 (6) +1 other reference
ⓘ Peerless Mine	[Opal] Černý et al. (1985)
Scenic ⓘ Bear Creek Basin	[Opal] Smith et al. (2000)
ⓘ Scenic south area (2)	[Opal] Roberts et al. (1965)
Todd County ⓘ Mission	[Opal] Ransom (1974)
ⓘ Walworth County	[Opal] Ransom (1974)
Tennessee Bradley County ⓘ Black Fox Quarry	[Opal] - (2005)
Hardin County ⓘ Coffee Bluff	[Amber] Zeitner (1968)
Overton County ⓘ Pilot Knob Prospect	[Opal] Paris (2011)
Texas Armstrong County ⓘ Diatomite deposit (MRDS 10276028)	[Opal] U.S Geological Survey +1 other reference
Brewster County Alpine ⓘ Ritchie Ranch	[Opal, Opal var: Opal-Agate] www.austingemandmineral.org
ⓘ Woodward Ranch	[Amber, Opal, Opal var: Precious Opal] ... +1 other reference
Christmas Mountains ⓘ Ferandes Mine (Destolin Mine; Scott claims; Gatlin claims)	[Opal] Smith (1991)
Davis Mountains ⓘ Cathedral Mountain quadrangle	[Opal] Smith (1991)
ⓘ Haleys Peak	[Opal, Opal var: Fire Opal] Dorothy M. Schlegal (1957)
ⓘ Terlingua Creek	[Amber] Smith (1991)
Burnet County ⓘ Cactus Jack pegmatite	[Opal, Opal-AN] Personally collected by Franklin Roberts
ⓘ Milwhite Quarry	[Opal] - (2005)
Duval County Freer ⓘ Cedro Hill	[Opal] R. Maxwell (1962) +1 other reference
ⓘ Fayette County	[Opal] Smith (1991)
ⓘ Hockley County	[Opal] USGS National Geochemical Database ...
Hudspeth County Quitman Mountains ⓘ Granite Hill prospect	[Opal] Smith (1991)
ⓘ Silver King Mine (Big Gulch Mine)	[Opal] Smith (1991)
Sierra Blanca Peaks ⓘ Little Blanca Mountain prospects	[Opal] Am Min 72:1122-1130
Jeff Davis County Davis Mountains ⓘ Medley's White Mountain	[Opal] Smith (1991)
Karnes County ⓘ Karnes Uranium Mining District	[Opal, Opal var: Opal-Agate] ... +1 other reference
Live Oak County Ray Point Mining District ⓘ McLean mine	[Opal] Bomber et al. (1986)
Llano County ⓘ Blount Mountain (Stewart property)	[Opal] Smith (1991)
Bluffton ⓘ Baringer Hill Mine	[Opal] Smith (1991)
Kingsland Granite Company Quarry (Petrick Quarry) ⓘ Petrick pegmatite	[Opal, Opal-AN] Self-collected by Franklin Roberts.
ⓘ Rode Ranch pegmatite	[Opal, Opal-AN] November 1964 +3 other references
ⓘ Six Mile quarry	[Opal] Smith (1991)
Maverick County ⓘ Eagle Pass	[Amber] BEG Rept Invest 42
ⓘ Presidio County	[Opal, Opal-AN] Girard (1964, February)
ⓘ Mammoth Mine	[Opal] Smith (1991)
Sutton County Edwards Plateau ⓘ Caverns of Sonora (Mayfield Cave)	[Opal] Onac et al. (2001)
U.S. Virgin Islands St Croix ⓘ Judith Fancy Formation ?	[Opal] Am Min 50:752
Utah Beaver County Beaver ⓘ Unnamed Opal-AN occurrence [1]	[Opal, Opal-AN] Bullock (1981)
Lincoln Mining District ⓘ Creole Mine	[Opal] Bullock (1981)
ⓘ Milford	[Opal] Bullock (1981)
ⓘ Hyalite occurrence	[Opal, Opal-AN] Rick Dalrymple
Roosevelt Hot Springs Mining District ⓘ Roosevelt Hot Springs	[Opal] Petersen (1975)
ⓘ Roosevelt Hot Springs Geothermal Resource Area	[Opal] Nielson +4 other references
ⓘ Ruby Violet claims	[Opal, Opal-AN var: Hyalite] Nassau et al. (1968)
San Francisco Mining District Frisco ⓘ Horn Silver Mine	[Opal] Bullock (1981)
San Francisco Mountains ⓘ Brimstone Mound	[Opal] Bullock (1981)
Box Elder County Crater Island Crater Island Mining District ⓘ Pass Occurrence	[Opal] - (2005)
Hogup Mountains ⓘ Kelton Butte Diatomite Occurrence	[Opal] - (2005)
ⓘ Peplin Flats Diatomite Occurrence	[Opal] - (2005)
Daggett County Red Creek (Browns Park) ⓘ Yellow Canary Uranium deposit	[Opal, Opal-AN] Bullock (1981) +1 other reference
Uinta Mountains ⓘ Red Creek complex	[Opal, Opal-AN] Bullock (1981)
Emery County ⓘ Temple Mountain Mining District	[Opal, Opal-AN] Palache et al. (1951) +1 other reference
Garfield County Hatch ⓘ Hillsdale Diatomite Occurrence	[Opal] - (2005)
Spry Mining District ⓘ Veater Mercury Prospect	[Opal] - (2005)
Grand County ⓘ Cisco	[Opal] Bullock (1981)
Iron County ⓘ Cedar City	[Opal] Rolf Luetcke
Gold Springs Mining District (Hamlin Valley) ⓘ CIMA (Marietta; Stratton) Mine	[Opal] Bullock (1981)
Juab County East Tintic Mountains ⓘ Tintic Mining District	[Opal] Bullock (1981)
San Pitch Mountains ⓘ Orme property	[Opal] Bullock (1981)
ⓘ Thomas Range	[Opal] T. Kennedy collection
ⓘ Buena no. 1 claim	[Opal] Bullock (1981)
ⓘ Garnet Basin	[Opal] Holfert et al. (1996)
ⓘ Spor Mountain Mining District	[Opal, Opal-AN var: Hyalite] Rockpick Legend
ⓘ Brush Wellman Mine	[Opal] Luetcke (n.d.)
ⓘ Nonella prospect	[Opal] Thurston +3 other references
Starvation Canyon ⓘ Holfertite pit	[Opal] Rick Dalrymple Collection
ⓘ Topaz Mountain	[Opal, Opal-AN] Bullock (1981)
ⓘ Autunite No. 8 claim	[Opal] Am.Min.: 45: 39-52 +1 other reference
ⓘ The Cove (Topaz Valley)	[Opal, Opal-AN] Greg Slak specimen
Millard County House Range ⓘ Diatomaceous Earth (MRDS - 10010745)	[Opal] - (2005)
Piute County Antelope Range Henry Mining District (Durkee Mining District) ⓘ Prospector Mine (Sugar Daddy Incline)	[Opal] - (2005)
Marysvale Mining District ⓘ J & L Alunite Mine	[Opal, Opal-AN] Bullock (1981)
ⓘ Silica Hills	[Opal] Bullock (1981)
Salt Lake County Bingham Mining District Bingham Canyon ⓘ Bingham Canyon Mine	[Opal] North (2010)
ⓘ Galena Mine	[Opal] Bullock (1981)
ⓘ Old Jordan Mine 1863 (U. S. Mining Company 1899)	[Opal] Bullock (1981)
San Juan County White Canyon Mining District ⓘ Gonaway-North Point claim	[Opal] USGS: Geological Survey Circular 217
Sevier County ⓘ Aurora	[Opal, Opal-AN]
ⓘ Fish Lake	[Opal] Bullock (1981)
Tooele County Bingham Mining District ⓘ Carr Fork Mine	[Opal] - (2005)
ⓘ Carr Fork Mine (Utah Apex Pre 1947)	[Opal] - (2005)
Gold Hill Mining District (Clifton Mining District) Clifton ⓘ Monocco Mine	[Opal] Bullock (1981) +1 other reference
ⓘ Wilson Consolidated Mine	[Opal] - (2005)
Gold Hill ⓘ Alvarado Mine	[Opal] Bullock (1981) +1 other reference
ⓘ Gold Hill Mine	[Opal] Bullock (1981)
ⓘ U.S. Mine	[Opal] - (2005)
ⓘ Gold Hill Wash Prospect	[Opal] - (2005)
ⓘ Murphy-Lucky Strike Prospects	[Opal] - (2005)
ⓘ Undine Mine	[Opal] Bullock (1981) +1 other reference
Grassy Mountains ⓘ Diatom Gulch Occurrence	[Opal] - (2005)
Lakeside Mining District ⓘ Delle Diatomaceous Earth Occurrence	[Opal] - (2005)
Stansbury Island ⓘ Diatomaceous Earth prospect	[Opal] Tripp (1980) +1 other reference
Vermont Orleans & Lamoille Cos. Lowell & Eden ⓘ Belvidere Mountain Quarries	[Opal] King (n.d.)
Windham County ⓘ Guilford	[Opal] Morrill & Chaffee
Virginia Albemarle County Stony Point ⓘ Stony Point Mine	[Opal] Dietrich (1990)
Amelia County ⓘ Amelia (Amelia Court House)	[Opal] Dietrich (1990)
Winterham ⓘ Morefield Mine (Morefield pegmatite)	[Opal, Opal-AN] Mike Dennis specimens
Augusta County Parnassus ⓘ Buck Hill	[Opal] Rocks & Minerals 84:352-362.
West Augusta ⓘ Stoutameyer Branch (Stotameyer Creek)	[Opal] Robin D. Tibbit (deceased)
Botetourt County Buchanan ⓘ James River Hydrate Quarries	[Opal] Rocks & Min.:60:165.
Chesterfield County Chester ⓘ Dale Quarry	[Opal, Opal-AN var: Hyalite] Michael Hatskel Collection
Clarke County ⓘ Berryville Mine (Keneagy Ore Bank)	[Opal] Dietrich (1990)
Culpeper County Mitchell ⓘ Cedar Mountain Stone Corp. Quarry (A. H. Smith quarry)	[Opal, Opal-AN]
Rapidan ⓘ Unnamed Quarry	[Opal] Dietrich (1990)
ⓘ Fairfax County	[Opal, Opal-AN] Ransom (1974)
Culpeper Basin ⓘ Centreville	[Opal] Dietrich (1990)
Hanover County ⓘ Ashland	[Opal] Dietrich (1990)
Henrico County Richmond ⓘ Forest Hill Park	[Opal, Opal-AN] Dietrich (1990)
Henry County ⓘ Axton	[Opal, Opal-AN] Dietrich (1990)
King George County ⓘ Greenlaws Wharf	[Opal] Dietrich (1990)
Loudoun County Conklin ⓘ Bull Run Quarry	[Opal, Opal-AN] Dietrich (1990)
Leesburg ⓘ Old Goose Creek Quarry	[Opal, Opal-AN] Dietrich (1990)
ⓘ Virginia Trap Rock Quarry (Goose Creek quarry)	[Opal, Opal-AN] Dietrich (1990)
Louisa County Gold-Pyrite Belt ⓘ Allah Cooper Mine (Alley-Cooper Mine; Ali Cooper Mine; Valcooper Mine)	[Opal] Kearns +1 other reference
Lunenburg County ⓘ Kenbridge Quarry	[Opal, Opal-AN] Dietrich (1990)
ⓘ Powhatan County	[Opal] Holland (2006)
ⓘ Colman Jones Farm	[Opal] Dietrich (1990)
Flat Rock ⓘ Herbb No. 2 Mine	[Opal, Opal-AN] Dietrich (1990)
Prince William County Manassas ⓘ Vulcan Materials Company Crushed Stone Quarry (Manassas Quarry)	[Opal] Dietrich (1990)
Richmond (City) ⓘ Carter Wharf	[Opal] Dietrich (1990)
Roanoke County ⓘ US highway 220 roadcut	[Opal, Opal-AN] Dietrich (1990)
Wise County ⓘ Coeburn	[Opal] Dietrich (1990)
ⓘ Norton	[Opal] Dietrich (1990)
Washington Benton County ⓘ Hanford	[Opal] Tschernich (1992)
Chelan County Wenatchee Mining District ⓘ Wenatchee	[Amber] Cannon (1975)
Clark County Orchards ⓘ Livingston Quarry	[Opal] Bill Tompkins collection +1 other reference
Douglas County ⓘ Rock Island Dam	[Opal] Tschernich et al. (1982) +1 other reference
Ferry County Republic Mining District ⓘ Knob Hill Mine	[Opal] - (2005)
Grant County Coulee City ⓘ ~~Coulee City Marina~~	[Opal, Opal-AN] T Douglas Schonewald Collection
ⓘ State Route 17 road cut [1]	[Opal, Opal var: Common Opal] T Douglas Schonewald Collection
ⓘ State Route 17 road cuts [2]	[Opal, Opal-AN, Opal var: Common Opal] Personally collected by T Douglas ...
Frenchman Hills ⓘ Diatomite Mines (Diatomite Pit South)	[Opal]
Mattawa ⓘ Saddle Mountain	[Opal] Cannon (1975)
Quincy ⓘ Diatomite Mines (Diatomite Pit North)	[Opal] Menicucci (2010)
Warden ⓘ Perch Point-Potholes Reservoir (Medicare Beach)	[Opal, Opal-AN, Opal var: Common Opal] T Douglas Schonewald Collection
ⓘ State Route 262 roadcuts	[Opal, Opal-AN] T Douglas Schonewald Collection
King County Snoqualmie Mining District ⓘ Denny Mountain	[Opal] Karl Volkman Personal Collection
ⓘ Denny Gulch	[Opal] John Lindell Collection
ⓘ Tiger Mountain	[Amber] Cannon (1975) +1 other reference
Kittitas County ⓘ Vantage area	[Opal] www.mineralcouncil.org (n.d.)
Klickitat County Roosevelt ⓘ Roosevelt area	[Opal] Cannon (1975)
Lewis County Morton Mining District Glenoma ⓘ Barnum-McDonnell Mine	[Opal] Cannon (1975)
ⓘ Lytle-Lynch Mine	[Opal] Cannon (1975)
ⓘ Roy Mine	[Opal] Cannon (1975)
Morton ⓘ Spencer Mine	[Opal] Cannon (1975)
Lincoln County ⓘ Mondovi	[Opal, Opal-AN, Opal var: Hydrophane] Dake (1956)
ⓘ Mount Rainier National Park	[Opal] Rye et al. (2003)
Okanogan County Golden Horn Batholith ⓘ Washington Pass	[Opal, Opal-AN var: Hyalite] John Lindell field-collected specimens.
Skagit County ⓘ Mount Vernon Mine	[Opal] American Mineralogist 28:257-271 +2 other references
Skamania County Cook ⓘ Carpathite occurrence	[Opal] Gladwell (2022)
Spokane County ⓘ Spokane	[Opal, Opal-AN] www.mindat.org (n.d.)
ⓘ City Quarry	[Opal] Rocks & Min.:8:30.
Walla Walla County Dixie ⓘ Dixie Road Cut Siderite Occurrence	[Opal] Jared Goguen
Whitman County ⓘ Moses (Clarkston)	[Opal] Micro Probe Volume VII Number 9 Spring ...
Pullman ⓘ Pullman area quarries	[Opal, Opal var: Precious Opal] Cannon (1975)
Whelan ⓘ Unnamed opal occurrence	[Opal] Cannon (1975)
Yakima County ⓘ Chinook Pass	[Opal, Opal-AN, Opal var: Common Opal] T Douglas Schonewald Collection
ⓘ Selah Butte	[Opal] Mustoe (2025)
West Virginia Monongalia County ⓘ Coopers Rock	[Opal]
Wisconsin Dodge County Iron Ridge Mining District (Neda Iron Mining District) ⓘ Iron Ridge Mines	[Opal] Hawley (1934)
ⓘ Iron Ridge Mine (Neda Mine; Oliver Mine)	[Opal] Hawley (1934)
ⓘ Mayville Shaft Mine	[Opal] Hawley (1934)
Florence County Fern Pine River pegmatites ⓘ Animikie Red Ace pegmatite	[Opal, Opal-AN] Sirbescu et al. (2008)
Marathon County ⓘ Wausau Intrusive Complex	[Opal, Opal-AN] Falster (1981) +1 other reference
ⓘ "Rotten granite" quarries	[Opal] Falster (1987)
ⓘ Wyoming	[Amber] Mason (1976)
ⓘ Albany County	[Opal] Ransom (1974)
Campbell County ⓘ Wyodak Mine	[Amber] Hausel et al. (2001)
Carbon County ⓘ Anderson Ranch	[Opal] Personal Collection of Matthew Neuzil
ⓘ Hanna Basin	[Amber] Hausel et al. (2001)
Crook County ⓘ Bear Lodge alkaline igneous complex	[Opal] Van Rythoven et al. (2020)
Bear Lodge Mining District ⓘ Lytle 5 Claim	[Opal, Opal-AN var: Hyalite] Frank Karasti
Fremont County ⓘ Lucky MC mine (Lucky Mac)	[Opal] Am Min 51:1567-1578
ⓘ Vitro Uranium Open Pit	[Opal] - (2005)
Natrona County ⓘ Angel Agates occurrence	[Opal] Wyoming Agates. Jade State News Volume ...
ⓘ Park County	[Opal] Yale Peabody Museum
Grand Canyon of the Yellowstone ⓘ Seven Mile Well	[Opal] 2009 Portland GSA Annual Meeting (18-21 October 2009) +1 other reference
Teton County ⓘ Jackson Hole area	[Amber] Hausel et al. (2001)
Moran ⓘ Glade Creek	[Opal, Opal-AN] Iddings et al. (1892)
ⓘ Yellowstone National Park	[Opal] November 1972 +3 other references

Uzbekistan
Ferghana Region Uzbekistan District ⓘ Shorsu deposit (Shor-Su deposit)	[Opal] Uklonskiy et al. (1964) +1 other reference
Navoiy Central Kyzylkum Region Bukantau Mountains ⓘ Alisai Mn deposit	[Opal, Opal var: Cacholong] Pechenkin et al. (2005)
Lyavlyakan-Beshkak ore field ⓘ Beshkak U deposit	[Opal] Solodov et al. (2001)
ⓘ Okzhetpes Ag-Au deposit	[Opal] Ishbobaev et al. (2023)
ⓘ Sugraly U deposit	[Opal] Dahlkamp (2009)
Tashkent Region Ohangaron District ⓘ Kurgashinkan Mine	[Opal] Golovanov (UzSSR)

Vanuatu
Tanna Island ⓘ Yasur	[Opal, Opal-AN] R. Martin personal collection

Venezuela
Amazonas ⓘ Cerro Autana Cave	[Opal] Urbani (1996)
Bolívar Gran Sabana Municipality Auyán-tepui (Auyán-tepuy; Ayan Tepui) ⓘ Cueva Guacamaya	[Opal] Sauro et al. (2013)
ⓘ Imawarì Yeuta cave	[Opal] Sauro et al. (2013) +1 other reference
ⓘ Sima Aonda Superior	[Opal] BOLETÍN INFORMATIVO DE LA COMISIÓN DE GEOESPELEOLOGÍA (Federación Espeleológica de América Latina y el Caribe -FEALC-)
Chimantá Massif (Chimantha Massif) ⓘ Akopan-Dal Cin cave system	[Opal] Galli et al. (2013)
ⓘ Roraima Sur Cave System	[Opal] Franco Urbani (2017)
ⓘ Cojedes	[Opal] Charlie Smith Collection
Miranda ⓘ Cueva de Baruta	[Opal] Urbani (1996)
ⓘ Unspecified Caves	[Opal, Opal var: Opal-CT] Franco Urbani (2009)

Vietnam
Bà Rịa-Vũng Tàu Province Đất Đỏ District ⓘ Nui Thom	[Opal] "Mario Lazzerini Denchi" Collection
Lâm Đồng Province Don Duong District Lac Xuan ⓘ Kankin quarry	[Opal] "Mario Lazzerini Denchi" Collection

Zimbabwe
Matabeleland North Hwange District Dinde ⓘ Unnamed opal showing	[Opal, Opal var: Cacholong] Wolfgang Hampel

Mars
Aeolis quadrangle Gale Crater Aeolis Mons (Mount Sharp) ⓘ Lower Mt. Sharp	[Opal] Milliken et al. (2016)
ⓘ Marias Pass ?	[Opal] Morris et al. (2016)
Pahrump Hills ⓘ Telegraph Peak	[Opal, Opal var: Opal-CT] Morrison et al. (2024)
Oxia Palus quadrangle ⓘ Mawrth Vallis ?	[Opal] Bishop et al. (2008) +2 other references
Syrtis Major quadrangle ⓘ Jezero Crater ?	[Opal] Horgan et al. (2020)
ⓘ Nili Patera ?	[Opal] Sun et al. (2016)
Valles Marineris ⓘ Juventae Chasma	[Opal] Bishop et al. (2009)
Ophir Planum ⓘ Elorza Crater ?	[Opal] Sun et al. (2016)

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