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Sepiolite Group

A group of related mineral species

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Photos of Sepiolite Group (101)Discuss Sepiolite Group

Sepiolite Group Gallery Search Photos of Sepiolite Group

Edit Sepiolite Group Add Synonym Edit CIF structures Clear Cache

Loughlinite

Westvaco mine, Green River Basin, Sweetwater County, Wyoming, USA

Loughlinite

Green River Formation, USA

Sepiolite

Valley, Stevens County, Washington, USA

Loughlinite

Westvaco mine, Green River Basin, Sweetwater County, Wyoming, USA

Loughlinite

Green River Formation, USA

Sepiolite

Valley, Stevens County, Washington, USA

Loughlinite

Westvaco mine, Green River Basin, Sweetwater County, Wyoming, USA

Loughlinite

Green River Formation, USA

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About Sepiolite GroupHide

Related to the palygorskite group.

Unique IdentifiersHide

Mindat ID:

35733

Long-form identifier:

mindat:1:1:35733:9

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0004269	Sepiolite	Post J E, Bish D L, Heaney P J (2007) Synchrotron powder X-ray diffraction study of the structure and dehydration behavior of sepiolite American Mineralogist 92 91-97	2007	Durango, Mexico	293
0004270	Sepiolite	Post J E, Bish D L, Heaney P J (2007) Synchrotron powder X-ray diffraction study of the structure and dehydration behavior of sepiolite American Mineralogist 92 91-97	2007	Durango, Mexico	293
0018529	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Batallones, Madrid, Spain	498
0018530	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Batallones, Madrid, Spain	298
0018531	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Grant County, New Mexico, USA	498
0018532	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Grant County, New Mexico, USA	298
0018533	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Fauske, Nordland, Norway	498
0018534	Sepiolite	Sanchez M, Garcia-Romero E, Suarez M, Silva I, Fuentes-Montero L, Martinez-Criado G (2011) Variability in sepiolite: Diffraction studies American Mineralogist 96 1443-1454	2011	Fauske, Nordland, Norway	298
0018363	Sepiolite	Giustetto R, Levy D, Wahyudi O, Ricchiardi G, Vitillo J G (2011) Crystal structure refinement of a sepiolite/indigo Maya Blue pigment using molecular modelling and synchrotron diffraction European Journal of Mineralogy 23 449-466	2011	Germany	293
0018364	Sepiolite	Giustetto R, Levy D, Wahyudi O, Ricchiardi G, Vitillo J G (2011) Crystal structure refinement of a sepiolite/indigo Maya Blue pigment using molecular modelling and synchrotron diffraction European Journal of Mineralogy 23 449-466	2011	synthetic	293
0015633	Sepiolite	Brauner K, Preisinger A (1956) Struktur und entstehung des sepioliths Tschermaks Mineralogische und Petrographische Mitteilungen 6 120-140	1956		293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Sepiolite'
loop_
_publ_author_name
'Post J E'
'Bish D L'
'Heaney P J'
_journal_name_full 'American Mineralogist'
_journal_volume 92 
_journal_year 2007
_journal_page_first 91
_journal_page_last 97
_publ_section_title
;
 Synchrotron powder X-ray diffraction study of the structure and dehydration
 behavior of sepiolite
 Sample: T = room temperature, in air
;
_database_code_amcsd 0004269
_chemical_compound_source 'Durango, Mexico'
_chemical_formula_sum 'Mg4 Si6 O22.91 H13.82'
_cell_length_a 13.405
_cell_length_b 27.016
_cell_length_c 5.2750
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1910.339
_exptl_crystal_density_diffrn      2.247
_symmetry_space_group_name_H-M 'P n c n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Mg1   0.00000   0.02970   0.25000   1.00000   0.04000
Mg2   0.00000   0.08500   0.75000   1.00000   0.04000
Mg3   0.00000   0.14340   0.25000   1.00000   0.04000
Mg4   0.00000   0.20490   0.75000   1.00000   0.04000
Si1   0.20260   0.02820   0.58600   1.00000   0.04000
Si2   0.19730   0.14090   0.57600   1.00000   0.04000
Si3   0.20420   0.19490   0.07000   1.00000   0.04000
O1   0.08240   0.02760   0.58500   1.00000   0.03500
O-H2   0.08050   0.08540   0.08100   1.00000   0.03500
O3   0.07620   0.14310   0.59700   1.00000   0.03500
O4   0.08470   0.19710   0.07700   1.00000   0.03500
O5   0.24800   0.00400   0.32400   1.00000   0.03500
O6   0.24510   0.08490   0.57900   1.00000   0.03500
O7   0.24300   0.17080   0.33400   1.00000   0.03500
O8   0.24900   0.17360   0.80200   1.00000   0.03500
O9   0.25000   0.25000   0.08900   1.00000   0.03500
Wat10   0.08800   0.25960   0.59400   1.00000   0.03500
Wat11   0.56200   0.91000   0.98800   0.91000   0.10000
Wat12   0.50000   0.18000   0.25000   1.00000   0.10000
Wat13   0.50000   0.02300   0.25000   0.43000   0.10000
Wat14   0.43900   0.15700   0.74000   0.33000   0.10000

Relationship of Sepiolite Group to other SpeciesHide

Sepiolite Group Members:

Falcondoite	(Ni,Mg)₄Si₆O₁₅(OH)₂ · 6H₂O	Orth.
Ferrisepiolite	(Fe³⁺,Fe²⁺,Mg)₄((Si,Fe³⁺)₆O₁₅)(O,OH)₂ · 6H₂O	Orth. mmm (2/m 2/m 2/m)
Loughlinite	Na₂Mg₃Si₆O₁₆ · 8H₂O	Orth. mmm (2/m 2/m 2/m)
Sepiolite	Mg₄(Si₆O₁₅)(OH)₂ · 6H₂O	Orth. mmm (2/m 2/m 2/m) : Pnna

Minerals structurally related to group:

Kalifersite

(K,Na)₅Fe³⁺₇Si₂₀O₅₀(OH)₆ · 12H₂O

Other InformationHide

Health Risks:

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

Internet Links for Sepiolite GroupHide

mindat.org URL:

https://www.mindat.org/min-35733.html
Please feel free to link to this page.

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References for Sepiolite GroupHide

Reference List:

Stathopoulou, Elizabeth T., Suárez, Mercedes, García-Romero, Emilia, Río, Manuel Sánchez Del, Kacandes, George H., Gionis, Vassilis, Chryssikos, Georgios D. (2011) Trioctahedral entities in palygorskite: Near-infrared evidence for sepiolite-palygorskite polysomatism. European Journal of Mineralogy, 23 (4) 567-576 doi:10.1127/0935-1221/2011/0023-2112

Guggenheim, Stephen, Krekeler, Mark P.S. (2011) The Structures and Microtextures of the Palygorskite–Sepiolite Group Minerals. In Developments in Clay Science. Elsevier. p.3-32. doi:10.1016/b978-0-444-53607-5.00001-3

Suárez, Mercedes, García-Romero, Emilia (2013) Sepiolite–Palygorskite: A Continuous Polysomatic Series. Clays and Clay Minerals, 61 (5) 461-472 doi:10.1346/ccmn.2013.0610505

Localities for Sepiolite GroupHide

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.

Locality ListHide

- 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.


Argentina
Río Negro Province Valcheta Department Aguada Cecilio ⓘ Cecchi quarry	[Sepiolite] Hayase et al. (1970)

Atlantic Ocean
Mid-Atlantic Ridge complex Ashadze hydrothermal area ⓘ Ashadze 2	[Sepiolite] Ayupova et al. (2018)
ⓘ Trans-Atlantic Geotraverse hydrothermal field (TAG)	[Sepiolite] Milinovic +6 other references

Australia
New South Wales Wentworth Co. Wentworth Nampoo Station ⓘ Devil's Elbow (Sharp Point)	[Sepiolite] Segnit (1973)
Northern Territory Barkly Region Tennant Creek ⓘ Peko Mine	[Sepiolite] Sorrell (n.d.)
Queensland City of Mount Isa Mount Isa ⓘ Mount Isa Mines	[Sepiolite] Sielecki (1988)
ⓘ Cloncurry Shire	[Sepiolite]
ⓘ North Burnett Region	[Sepiolite] Updated list originally distributed by ...
Mount Biggenden ⓘ Biggenden Mine	[Sepiolite] part of list University of Queensland
South Australia Pastoral Unincorporated Area Iron Knob ⓘ Iron Monarch Main Pit	[Sepiolite] Sorrell (n.d.)
Tasmania King Island municipality King Island Grassy ⓘ Dolphin Tungsten Mine	[Sepiolite]
Waratah-Wynyard municipality Heazlewood district ⓘ Lord Brassey Mine	[Falcondoite] Bottrill et al. (2008)
Western Australia Leonora Shire Linden Goldfield ⓘ Red October Gold Mine	[Sepiolite] Graham (2003)
Wiluna Shire Mount Keith ⓘ Mount Keith Open Pit	[Sepiolite] Grguric (2003)

Austria
Carinthia Sankt Veit an der Glan District Hüttenberg ⓘ Hüttenberger Erzberg	[Sepiolite] Niedermayr et al. (1995)
Spittal an der Drau District Millstatt Millstätter Alpe ⓘ Magnesite Mine	[Sepiolite] Pichler (2009)
Lower Austria Horn District Brunn an der Wild St Marein ⓘ Marble quarry	[Sepiolite] Helmut Pristacz PXRD analysis 8/09 +1 other reference
Krems-Land District Lichtenau im Waldviertel Brunn am Walde ⓘ Malaschofsky Quarry	[Sepiolite] Pristacz et al. (2009)
Straß im Straßertale ⓘ Gaisberg (Gaißberg)	[Sepiolite] SIGMUND (1937a)
Melk District Dunkelsteinerwald Gansbach ⓘ Mitterbachgraben	[Sepiolite] Exel (1993)
Waidhofen an der Thaya District Waldkirchen an der Thaya ⓘ Waldkirchen an der Thaya	[Sepiolite] Huber et al. (1977)
Zwettl District Pölla Altpölla ⓘ Töppenitzgraben (Töpenitzgraben; Töbernitzgraben; Töppenitzbach)	[Sepiolite] Exel (1993)
Salzburg Tamsweg District Mauterndorf Mauterndorf quarries ⓘ Mauterndorf quarry	[Sepiolite] Steinwender et al. (2012)
Zell am See District Uttendorf ⓘ Totenkopf (incl. Lower Riffl glacier)	[Sepiolite] Strasser (1989)
Styria Bruck-Mürzzuschlag District Breitenau am Hochlantsch Hochlantsch ⓘ Breitenau Mine	[Sepiolite] Exel (1993)
Neuberg an der Mürz Arzbach (Arzbachleiten) ⓘ Magnesite quarry	[Sepiolite] Hackenberg (2003)
Tragöß-Sankt Katharein Oberdorf (Oberdorf an der Laming) ⓘ Oberdorf magnesite deposit	[Sepiolite] Exel (1993)
Leibnitz District Wildon Weitendorf ⓘ Basalt quarry	[Sepiolite] Neschen (n.d.)
Leoben District Leoben Galgenberg ⓘ Railway tunnel	[Sepiolite] Hollerer (1999)
Murtal District Hohentauern Sunk ⓘ Magnesite deposit	[Sepiolite] Aufschluss 1972 (SB) +1 other reference
Sankt Marein-Feistritz ⓘ Gulsen	[Sepiolite] Exel (1993)
Sankt Margarethen bei Knittelfeld Sankt Lorenzen bei Knittelfeld ⓘ Preg	[Sepiolite] Exel (1993)
Upper Austria Steyr-Land District Ternberg ⓘ Trattenbach	[Sepiolite] Neschen (n.d.)

Belarus
Mogilev Region Babruysk District ⓘ Bobruisk Ring Structure	[Ferrisepiolite] Levitskiy et al. (2018, July)

Belgium
Flanders Flemish Brabant Lubbeek ⓘ Roelants sand pit	[Sepiolite] Hugget et al. (1996) +2 other references

Brazil
Amazonas Presidente Figueiredo Pitinga mine ⓘ Madeira pluton	[Sepiolite] Bastos Neto et al. (2009)
Goiás Barro Alto ⓘ Barro Alto Ni mine	[Sepiolite] Ratié et al. (2015)

Canada
British Columbia Cariboo Mining Division Horsefly Quesnel Lake ⓘ Eaglet fluorite deposit	[Sepiolite] Peatfield (n.d.)
Manitoba Bird River area Bird River Sill ⓘ Dumbarton Mine	[Sepiolite] C. J. A. Coats and R. Buchan (1979)
ⓘ Maskwa Open Pit ?	[Sepiolite] Confirmed from historically collected ...
Ontario ⓘ Bancroft area	[Sepiolite] 162-165. +1 other reference
Greater Sudbury Levack Township ⓘ Strathcona Mine	[Sepiolite] Springer (1989)
Haliburton County Highlands East Township Cardiff Township ⓘ Cardiff Uranium Mine	[Sepiolite] Sabina (1982)
Monmouth Township ⓘ Canadian All Metals Mine	[Sepiolite] geological survey of canada economic ... +1 other reference
Leeds and Grenville Counties Lansdowne Township ⓘ Lyndhurst area (Black Rapids area)	[Sepiolite] Montgomery (n.d.)
Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)	[Sepiolite] Grice (1989) +1 other reference
Saskatchewan ⓘ North lngebright Lake	[Sepiolite] Shang (2000)

Chile
Atacama Copiapó Province Copiapó Quebrada San Miguel ⓘ Los Azules mine	[Sepiolite] XRD by Joachim Lorenz

China
Anhui Chuzhou Quanjiao County ⓘ Quanjiao sepiolite deposit	[Sepiolite] Wenguang Li (1997) +1 other reference
ⓘ Tongling	[Sepiolite] Many of these pieces are referred to as ...
Henan Nanyang ⓘ Xixia County	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
ⓘ Zhenping County	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
Sanmenxia ⓘ Lushi County	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
Hunan Changsha ⓘ Liuyang City	[Sepiolite] Yongzhang Zhou et al. (1993)
Yonghe ⓘ Yonghe sepiolite mine	[Sepiolite] Wenguang Li (1997) +1 other reference
Inner Mongolia Baotou City (Baotou Prefecture) Bayan Obo mining district Bayan Obo ⓘ Bayan Obo deposit	[Ferrisepiolite] Qingchang Meng (1981)
Jiangsu Huai'an Xuyi Co. ⓘ Yongxiaoshan sepiolite deposit	[Sepiolite] Wenguang Li (1997) +1 other reference
Jiangxi Jingdezhen Leping Co. ⓘ Guniuling sepiolite mine	[Sepiolite] Sakamoto et al. (1988) +1 other reference
Jilin Jilin Panshi City ⓘ Shizui Mine	[Sepiolite] Li et al. (2026)
Qinghai Hainan Xinghai County ⓘ Saishitang Mine (Saishentang Mine; Sashitang Mine)	[Ferrisepiolite] Williams et al. (2011) +1 other reference
Haixi Mongol and Tibetan Autonomous Prefecture Mangnai City (Mangya Co.) ⓘ Gasikule salt lake ?	[Sepiolite] Chang Xu (1985)
Shaanxi Hanzhong Ningqiang County ⓘ Ningqiang sepiolite deposit	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
Sichuan Liangshan Yi Dechang County ⓘ Dalucao REE deposit	[Sepiolite] Liu et al. (2015)
Ya'an Shimian County ⓘ Xinkang Asbestos mine	[Sepiolite] Industrial Minerals and Processing 33 (12)
Tibet Ngari Gê'gyai Co. (Geji Co.) ⓘ Mali Co (Ni Co; Mani Cuo; Ni Cuo) ?	[Sepiolite] Chang Xu (1985)
Xinjiang Ili Kazakh Autonomous Prefecture Tacheng Prefecture (Tarbaghatay Prefecture) Junggar Basin ⓘ Fengcheng Formation	[Loughlinite] ZHANG et al. (2018)
Yunnan Chuxiong ⓘ Wuding County	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
Wenshan Malipo County ⓘ Nanzhuang Mine	[Sepiolite] Kaiji Yu (1981)
Zhejiang Hangzhou ⓘ Lin'an District	[Sepiolite] Ruishi Yang and Wenguang Li (2001)

Colombia
Córdoba Department Montelíbano ⓘ Cerro Matoso Mine (Cerro Matoso S. A. Laterite deposit)	[Sepiolite] Econ Geol (2004) +2 other references
Magdalena Department ⓘ Ciénaga Marbles	[Sepiolite] Castellanos-Alarcón et al. (2016)

Czech Republic
Central Bohemian Region Kutná Hora District Malešov ⓘ Malešov deposit	[Sepiolite] Pauliš P. Mineralogické lokality ...
ⓘ Vlastějovice	[Sepiolite] Pauliš +4 other references
South Bohemian Region Český Krumlov District Černá v Pošumaví Bližná ⓘ Bližná quarry	[Sepiolite] Zikeš J.
South Moravian Region Blansko District Letovice ⓘ Slatinka	[Sepiolite] Ulrych
Brno-Country District ⓘ Nedvědice	[Sepiolite] Houzar
Nová Ves ⓘ Serpentinite occurrence	[Sepiolite] Koníčková Š. et al. (2016)
Vysočina Region Žďár nad Sázavou District ⓘ Strážek (Straschkau)	[Sepiolite] Helmut Pristacz jr. PXRD analysis 8/09 (specimen in doubles collection in NHM Vienna)
ⓘ Věchnov	[Sepiolite] Pelíšek

Dominican Republic
Monseñor Nouel Province Bonao ⓘ Falcondo Mines	[Falcondoite] Villanova-de-Benavent et al. (2014)
ⓘ Loma Caribe Ni laterite deposit	[Sepiolite] Domènech et al. (2022)
ⓘ Loma Peguera deposit	[Falcondoite] Springer (1976)

France
Auvergne-Rhône-Alpes Haute-Loire Brioude Vieille-Brioude ⓘ Ricoules Mine (Rousseille Mine; Brugerolle Mine)	[Sepiolite]
Rhône Villefranche-sur-Saône Le Breuil ⓘ Les Ponts-Tarrets	[Sepiolite] G. Demarcq
Centre-Val de Loire Cher Vierzon ⓘ Quincy	[Sepiolite] The Quincyte pigments: fossil quinones ...
Grand Est Marne Reims Champigny ⓘ Chenevières	[Sepiolite] Bariand et al. (n.d.)
New Caledonia Northern Province Kouaoua ⓘ Anniversaire Mine	[Sepiolite] Manceau et al. (1985)
Occitanie Tarn Castres Montredon-Labessonnié Peyrebrune ⓘ Le Rivet Quarry	[Sepiolite] Guy Bernadi collection & Georges ...
Provence-Alpes-Côte d'Azur Alpes-Maritimes Grasse Arrondissement ⓘ Biot	[Sepiolite] "Les minéralisations associées au volcanisme andésitique de Biot-Villeneuve Loubet (Alpes Maritimes)

Germany
Baden-Württemberg Freiburg Region Breisgau-Hochschwarzwald Bötzingen ⓘ Fohberg Quarry (Hauri Quarry)	[Sepiolite] Weisenberger et al. (2014) +1 other reference
ⓘ Kaiserstuhl	[Sepiolite] Weisenberger et al. (2014)
Bavaria Upper Bavaria Traunstein District Siegsdorf Hammer ⓘ Moosgraben serpentinite occurrence ?	[Sepiolite] Vielreicher R. M. (1991)
Upper Franconia Hof District Rehau Wurlitz ⓘ Heß quarry	[Sepiolite] F. Müller: "Bayerns steinreiche Ecke" et al. (Hof) +1 other reference
Zell im Fichtelgebirge ⓘ Haidberg Quarry	[Sepiolite] F. Müller: "Bayerns steinreiche Ecke" et al. (Hof)
Kulmbach District Kupferberg ⓘ Peterlesstein	[Sepiolite] F. Müller: "Bayerns steinreiche Ecke" et al. (Hof)
Rhineland-Palatinate Vulkaneifel Gerolstein Gerolstein Roth ⓘ Rother Kopf	[Sepiolite] Blaß et al. (2012)
Hillesheim ⓘ Graulay quarry ?	[Sepiolite] Blaß et al. (2015)
Saxony Erzgebirgskreis ⓘ Schneeberg	[Sepiolite] Lapis 30 (7/8)

Greece
Attica East Attica Lavreotiki Agios Konstantinos (Kamariza) Mercati mines ⓘ Christiana Mine	[Sepiolite] Färber (n.d.)
Central Macedonia Chalkidiki Polygyros ⓘ Ormylia mine	[Sepiolite] Sideridis et al. (2022)
ⓘ Vavdos mine	[Sepiolite] Sideridis et al. (2022)
South Aegean Milos ⓘ Serifos Island	[Sepiolite] Gauthier et al. (1991)

Greenland
Avannaata Nuussuaq Peninsula Marrait Kitdlit ⓘ "Ferri-Sepiolite" locality no. 1	[Sepiolite] Binzer et al. (1974)
Kujalleq ⓘ Ilímaussaq complex	[Sepiolite] Semenov (2001) +1 other reference
Northeast Greenland National Park ⓘ Mount Steensby	[Sepiolite var: Gunnbjarnite] American Mineralogist 37:1070-1071

Hungary
Pest County Szob District Nagybörzsöny ⓘ Alsó-Rózsa adit	[Sepiolite] Szakáll et al. (1996)
Veszprém County Ajka District Úrkút Csárda Hill ⓘ Úrkút Mine	[Sepiolite] Szakáll & Jánosi (1996)

India
Odisha Sundargarh District (Sundergarh District) ⓘ Ghoriajhor-Monmunda area	[Sepiolite] Mohapatra et al. (2003)

Indonesia
South Sulawesi Province East Luwu Regency Sorowako ⓘ Petea Mine	[Falcondoite] Sufriadin et al. (2012)

Iran	[Sepiolite]


Italy
Campania Metropolitan City of Naples Ercolano San Vito ⓘ San Vito Quarry	[Ferrisepiolite] Imma Punzo find & collection
Lombardy Sondrio Province Lanzada Franscia ⓘ Dossi di Franscia	[Sepiolite] Bedognè et al. (1993)
Torre di Santa Maria Torreggio Valley Airale Valley ⓘ Cassandra Glacier	[Sepiolite] Bedognè et al. (2006)
Piedmont Metropolitan City of Turin Angrogna ⓘ Alpe Caugis quarry	[Sepiolite] Vola (2020)
Baldissero Canavese Bettolino ⓘ Monti Pelati Nature Park	[Sepiolite] Glocker (1847)
Lessolo Calea ⓘ Brosso Mine	[Sepiolite] www.webmineralshop.com (2001)
Prali ⓘ Crosetto Mine	[Sepiolite] Ciriotti et al. (2011)
ⓘ Fontane mine	[Sepiolite] Piccoli et al. (2007)
ⓘ Sapatlè Mine	[Sepiolite] Piccoli et al. (2007)
Trentino-Alto Adige (Trentino-South Tyrol) South Tyrol Burggrafenamt (Burgraviato) Moos in Passeier (Moso in Passiria) ⓘ Monteneve Mine (Schneeberg Mine)	[Sepiolite] Exel (1987)
Tuscany Livorno Province Porto Azzurro ⓘ Terranera Mine	[Sepiolite] Garofalo et al. (2023)
Pisa Province Pomarance ⓘ Lagoni di Serrazzano	[Sepiolite] Orlandi (2005)
Veneto Vicenza Province Brendola ⓘ Contrada Bregòlo	[Sepiolite] Boscardin et al. (2011)
Cogollo del Cengio ⓘ Menegolli Quarry (Marmi Quarry)	[Sepiolite] Zordan A. et al. (Vicenza)
Cornedo Vicentino Spagnago ⓘ Grolla quarry	[Sepiolite] Boscardin et al. (2011) +1 other reference

Japan
Fukuoka Prefecture Kasuya District ⓘ Sasaguri	[Sepiolite] Masutomi Museum specimen (Kyoto) +1 other reference
Fukushima Prefecture Iwaki City ⓘ Yaguki mine (Yakuki mine)	[Sepiolite] - (n.d.)
ⓘ Gifu Prefecture	[Sepiolite] Yongzhang Zhou et al. (1993)
Hokkaidō Prefecture ⓘ Toyo mine	[Sepiolite] - (n.d.)
Iwate Prefecture Kamaishi City ⓘ Kamaishi mine	[Sepiolite] - (n.d.)
Kunohe-gun Hirono Ono ⓘ Funakozawa mine	[Sepiolite] - (n.d.)
Kyoto Prefecture Yosa District Yosa-mura ⓘ Oeyama mine	[Sepiolite] IMAI et al. (2000)
Miyagi Prefecture Kurihara City ⓘ Hosokura mine ?	[Sepiolite] Imai (1978)
Saga Prefecture Higashimatsuura district Genkai-cho Hinodematsu ⓘ Higashimatsuura basalt	[Sepiolite] Ishibashi (1974)
Saitama Prefecture Hanno City ⓘ Oukura mine (Ohkura mine)	[Sepiolite] Kato (2010)

Kazakhstan
Aktobe Region Kargaly District Kempirsay massif ⓘ Buranovskoye deposit	[Falcondoite] Korobkin et al. (2022)
ⓘ Shelektinskoye deposit	[Falcondoite] Korobkin et al. (2022)

Kenya
Kajiado County ⓘ Lake Amboseli	[Sepiolite] Stoessell et al. (1978) +1 other reference

Kosovo
Pristina District Lipjan ⓘ Gllavice Mine	[Sepiolite] Ilich et al. (2002) +1 other reference

Madagascar
Androy Ambovombe-Androy Ampamata ⓘ Mafilefy phlogopite mine	[Sepiolite] Collection de Minéralogie (LMV)
Bekily District Belindo Mahasoa ⓘ Mikoboka phlogopite deposit	[Sepiolite] Lautel (1953)
Beraketa ⓘ Ambondrombe	[Sepiolite] Lacroix (1941)
ⓘ Ampandrandava phlogopite mine	[Sepiolite] Behier (1963)

Malaysia
Pahang Lipis District Bukit Selinsing Koyan ⓘ Selinsing Gold Mine	[Sepiolite] Syed Hasan et al. (2018)
Perak Kinta District ⓘ Kramat Pulai Mine	[Sepiolite]

Mexico
Coahuila Cuatro Ciénegas Municipality Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza) Limestone caves ⓘ Rancho Guadalupe cave	[Sepiolite] Forti (2006)
Durango Durango Municipality Cerro de los Remedios Victoria de Durango ⓘ Cerro de Mercado Mine	[Sepiolite] Jurgeit (2001)
Zacatecas Concepción del Oro Municipality Concepción del Oro ⓘ Refugio Mine	[Sepiolite] Panczner (1987)

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

Morocco
Drâa-Tafilalet Region ⓘ Bou Azzer mining district	[Sepiolite] Weiß (2006)

Namibia
Erongo Region Arandis Constituency Langer Heinrich Mountain ⓘ Langer Heinrich uranium mine	[Sepiolite] Wilde (2023)
Oshikoto Region Omuthiyagwiipundi ⓘ Etosha Pan	[Loughlinite] Buch et al. (1996)

New Zealand
Nelson Region ⓘ Dun Mountain	[Sepiolite] Cox (1882)

North Macedonia
Kavadarci Municipality Ržanovo ⓘ Ržanovo Mine	[Sepiolite] Todor Serafimovski et al. (2012)
Lipkovo Municipality ⓘ Lojane	Hiessleitner (1934)

Norway
Agder Risør Akland ⓘ Moland Industrial Site	[Sepiolite] Garmo (2003)
Akershus Nittedal ⓘ Bjønndalen Quarry	[Sepiolite] Berg et al. (2003)
Buskerud ⓘ Kongsberg silver mining district	[Sepiolite] Wel (1972) +1 other reference
Øvre Eiker Gunhildrud ⓘ Bakstevalåsen	[Sepiolite] Jahren et al. (1998)
Innlandet Vang ⓘ Mugnetind	[Sepiolite] Sigurd Stordal collection +1 other reference
Nordland ⓘ Hattfjelldal	[Sepiolite] Nordrum (2010)

Pacific Ocean
Conical Seamount ⓘ Deep Sea Drilling Project Hole 779A	[Loughlinite] Fryer et al. (1992)

Poland
Lesser Poland Voivodeship Chrzanów County Gmina Alwernia ⓘ Regulice quarry	[Sepiolite] Eligiusz Szełęg private collection
Kraków County Gmina Krzeszowice Dębnik-Dubie area ⓘ Dubie	[Sepiolite] Lewandowska A. (OH)
ⓘ Niedźwiedzia Góra quarry	[Sepiolite] Gaweł A. et al. (2008)
ⓘ Rudno	[Sepiolite] Eligiusz Szełęg collection
Lower Silesian Voivodeship Kamienna Góra County Gmina Kamienna Góra ⓘ Czarnów ?	[Sepiolite] Lis et al. (1986)
Rędziny ⓘ Dolomitic marble quarry	[Sepiolite] Domań +2 other references
Świdnica County Gmina Marcinowice Wirki ⓘ 'Wiry' magnesite mine	[Sepiolite] Harańczyk C. (1974)
ⓘ Wiry	[Sepiolite] JANECZEK J.
Wrocław County Gmina Jordanów Śląski ⓘ Jordanów nephrite quarry	[Sepiolite] Lis et al. (1986)

Romania
Caraş-Severin County Moldova Nouă ⓘ Moldova Nouă Mine	[Sepiolite] www.minerals-of-the-carpathians +1 other reference
ⓘ Vărad	[Sepiolite] Gheorghiţescu et al. (1972)
Maramureș County Târgu Lăpuș ⓘ Răzoare	[Sepiolite] Szakáll (2002)

Russia
Chelyabinsk Oblast Agapovsky District ⓘ Sakharinskoye Ni deposit (Sakharinsky Mine)	[Sepiolite] Talovina et al. (2008)
Magnitogorsk Sakhara District (Sakharinskii) Sakhara massif ⓘ Sakhara Nickel mine	[Sepiolite] Talovina et al. (2008)
Verkhny Ufaley Ufaley District (Ufalei District) ⓘ Novocheremshanskiy Nickel Mine	[Sepiolite] Talovina et al. (2008) +2 other references
ⓘ Sinar Nickel Mine	[Sepiolite] Talovina et al. (2008)
Irkutsk Oblast Nizhneilimsky District Zheleznogorsk-Ilimsky ⓘ Korshunovskoye iron deposit	[Sepiolite] Mazurov et al. (2007)
Khabarovsk Krai Okhotsky District Svetloye epithermal district ⓘ Elena deposit	[Sepiolite] Левочская et al. (2021)
ⓘ Moscow	[Sepiolite] Pekin et al. (2010) +1 other reference
Murmansk Oblast ⓘ Lovozero Massif	[Sepiolite] ...
Lovozersky District Alluaiv Mountain ⓘ Umbozero mine	[Ferrisepiolite] Pavel.M. Kartashov (n.d.)
ⓘ Selsurt Mountain	[Ferrisepiolite] Nikita Chukanov analytical data
Orenburg Oblast Svetlinsky District Buruktal Mining District Buruktal massif ⓘ Buruktal Mine	[Sepiolite] Talovina et al. (2003)
Primorsky Krai Dalnegorsk Urban District Dalnegorsk ⓘ Nikolaevskiy Mine	[Sepiolite] Grant et al. (2001)
ⓘ Sakha	[Sepiolite] [World of Stones 12:49]

Saudi Arabia
Medina Region ⓘ Khamal Layered Mafic Intrusion	[Sepiolite] Abuamarah et al. (2023)

Slovakia
Banská Bystrica Region Rimavská Sobota District Hnúšťa ⓘ Mútnik deposit	[Sepiolite] Koděra (1986)
ⓘ Samo Mine	[Sepiolite] Koděra (1986)
ⓘ Klenovec	[Sepiolite] Koděra (1986)
Košice Region Rožňava District ⓘ Dobšiná	[Falcondoite] e-rocks.com (n.d.) +2 other references
Prešov Region Vranov nad Topľou District Vechec ⓘ Vechec quarry	[Sepiolite] Ďuďa

Slovenia
Oplotnica Cezlak ⓘ Tonalite quarry	[Sepiolite] Postl et al. (2015)

Somalia
Galguduud Region El Buur ⓘ El Bur sepiolite deposits	[Sepiolite] - (2005)

South Africa
Northern Cape ZF Mgcawu District Municipality Dawid Kruiper Local Municipality ⓘ Koi Pan	[Loughlinite] Roelofse (2010)
Mier ⓘ Brak Pan	[Loughlinite] Roelofse (2010)

South America Plate
Santos basin ⓘ Barra Velha Formation	[Sepiolite] Silva et al. (2025)
ⓘ Oil fields	[Sepiolite] Schrank et al. (2024)

South Korea
ⓘ North Chungcheong Province	[Sepiolite] old "Chuseihokudo" specimen on sale at ...

Spain
Andalusia Almería Níjar Cabo de Gata volcanic complex ⓘ Agua Amarga	[Sepiolite] Calvo Rebollar (2016)
Cádiz Jerez de la Frontera ⓘ Laguna de los Tollos quarry	[Sepiolite] Calvo (2016)
Málaga Cártama ⓘ Doña Ana quarries ?	[Sepiolite] Alejandro Sánchez Jiménez
Aragon Teruel Azaila ⓘ Los Pedreñales	[Sepiolite] Calvo (2008)
Zaragoza Orera ⓘ Isabel Mine	[Sepiolite] Calvo (2008)
Ruesca ⓘ Maria Luisa mine	[Sepiolite] Calvo (2008)
Asturias Salas Carlés ⓘ Carlés Mine	[Sepiolite] Calvo et al. (2014)
Castile-La Mancha Toledo ⓘ Yunclillos	[Sepiolite] Yongzhang Zhou et al. (1993)
ⓘ Yuncos saponite deposit	[Sepiolite] Pozo et al. (1993)
Castile and Leon Palencia ⓘ Villamuriel de Cerrato	[Sepiolite] Stvdia Geologica Salmanticensia
Segovia ⓘ Alconada de Maderuelo	[Sepiolite] Fernández Macarro et al. (1988)
ⓘ Miocene outcrops	[Sepiolite] Fernández Macarro et al. (1988)
ⓘ Bodón Blanco hyperalkaline playa-lake	[Sepiolite] Buey et al. (2025)
ⓘ Caballo Alba hyperalkaline playa-lake	[Sepiolite] Buey et al. (2025)
ⓘ Las Eras	[Sepiolite] Buey et al. (2025)
ⓘ Unnamed clay quarry	[Sepiolite] Buey et al. (2025)
Catalonia Girona Queralbs ⓘ Núria Valley	[Sepiolite] Petrov (n.d.)
Setcases ⓘ Felinc quarry (Pedrera d'en Felinc)	[Sepiolite] Petrov (n.d.)
Community of Madrid Madrid San Blas-Canillejas ⓘ Victoria Mining Group	[Sepiolite] Calvo (2018)
Vallecas ⓘ Sepiolite deposit	[Sepiolite] Ruishi Yang and Wenguang Li (2001)
ⓘ Vicálvaro	[Sepiolite] Rodríguez et al. (1994)
ⓘ Almodóvar Hill	[Sepiolite] www.foro-minerales.com (n.d.)
Extremadura Cáceres Castañar de Ibor ⓘ Castañar Cave	[Sepiolite] Alonso-Zarza et al. (2011)

Sweden
Värmland County Filipstad Långban Ore District ⓘ Långban Mine	[Sepiolite] Gatedal (n.d.) +1 other reference
Nordmark mining district ⓘ Taberg ore field (Nordmarks Taberg)	[Sepiolite]

Switzerland
Valais Goms Obergoms Oberwald ⓘ Ronco tunnel (Bedretto window; Ronco window) [north section]	[Sepiolite] Kipfer et al. (1979) +1 other reference

Tajikistan
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)	[Sepiolite] Badalov et al. (1977)

Tanzania
Arusha Region Longido District ⓘ Sinya mine	[Sepiolite] Sampson (1966)

Turkey
Ankara Province Beypazari District ⓘ Beypazarı trona deposit	[Loughlinite] Helvaci (1998)
Eskişehir Province Mihaliççik District ⓘ Killik	[Loughlinite] Echle (1967)
Kahramanmaraş Province ⓘ Köprüağzı Evaporites	[Sepiolite] Güngör Yeşilova et al. (2023)
Konya Province Ereğli District ⓘ Cakmak	[Sepiolite]
Karapınar District ⓘ Karapinar	[Sepiolite] Karakaya et al. (2004)
Niğde Province ⓘ Bor-Ulukışla basin	[Sepiolite] Altay et al. (2010)

UK
England Cornwall Grade-Ruan ⓘ Kennack	[Sepiolite] Golley et al. (1995)
Kennack Cove (Kennack Sands) ⓘ Eastern Cliff	[Sepiolite] Power et al. (1997)
ⓘ The Caerverracks ?	[Sepiolite]
ⓘ Thorny Cliff	[Sepiolite] Power et al. (1997)
Somerset Mendip Cranmore ⓘ Torr Works Quarry	[Sepiolite] Turner et al. (2010)
Worcestershire Malvern Hills ⓘ Wyche Quarries	[Sepiolite] Day (1999)
Scotland Shetland Islands Unst ⓘ Swinna Ness	[Sepiolite] Livingstone (2002)

USA
Alaska Valdez-Cordova Census Area Chisana Mining District ⓘ Nabesna Mine	[Sepiolite] U. S. Geological Survey Open-File ...
Arizona Cochise County ⓘ Bisbee	[Sepiolite] Graeme (1981)
Gila County Banner Mining District Christmas ⓘ Christmas Mine	[Sepiolite] Anthony et al. (1995)
Greenlee County Clifton ⓘ North of Clifton	[Sepiolite] Anthony et al. (1995)
La Paz County ⓘ Salome area	[Sepiolite] Anne Seminaris specimen +1 other reference
Pima County Sierrita Mountains Pima Mining District San Xavier Mission complex ⓘ San Xavier pit (San Xavier open pit; San Xavier West Mine; San Xavier Unit Open pit)	[Sepiolite] Anthony et al. (1995)
ⓘ Yavapai County	[Sepiolite] AmMin 27:512
ⓘ Santa Maria River Basin	[Sepiolite] Kauffman et al. (1943) +2 other references
ⓘ Unspecified remote locality	[Sepiolite] Anthony et al. (1995)
California Fresno County Piedra ⓘ Pine Flat Lake	[Sepiolite] Färber (n.d.)
Inyo County ⓘ Eagle Borax Spring	[Sepiolite] a spectroscopic exploration. Economic ... +1 other reference
ⓘ Half Dollar Mine ?	[Sepiolite] Hanks (1884) +1 other reference
Panamint Range (Panamint Mountains) Panamint Mining District (Ballarat Mining District) Ballarat ⓘ Ballarat Saponite deposit	[Sepiolite] Post (1984)
ⓘ Saline Valley	[Sepiolite] Hardie (1968) +2 other references
Los Angeles County ⓘ Santa Cruz offshore basin	[Sepiolite] Fleischer (1972) +2 other references
Riverside County Jurupa Valley Crestmore Crestmore quarries Sky Blue Hill ⓘ Commercial Quarry	[Sepiolite] Woodford et al. (1941) +3 other references
San Benito County Goat Mountain ⓘ Clear Creek claim	[Sepiolite] Dunning et al. (2005)
San Bernardino County Bristol Mountains Amboy area ⓘ New Method Mine	[Sepiolite] Otton +2 other references
Calico Mts (Calico Hills) Calico District (Daggett District; Calico-Daggett area) Calico ⓘ Gunn Mine	[Sepiolite] - (2005)
Kingston Range Kingston Range District Kingston Peak ⓘ Silver Rule Mine (Chambers Mine)	[Sepiolite] Hewett (1956) +2 other references
Silver Lake Mining District Soda Mountains Zzyzx ⓘ Blue Bell Mine	[Sepiolite] XRD confirmed by Tony Kampf. +1 other reference
ⓘ C-Site	[Sepiolite] Collected by and in the collection of ...
ⓘ Lower 2A-Site	[Sepiolite] Collected by and in the collection of ...
Santa Cruz County Ben Lomond Mountain ⓘ Spring Street Quarry (locality 270)	[Sepiolite] Leo (1967) +2 other references
Santa Cruz ⓘ Pacific Cement and Aggregate Company quarry	[Sepiolite] Cooper et al. (1986)
Colorado Montrose County Paradox Valley ⓘ Jo Dandy Mine	[Sepiolite] Palache et al. (1944)
Connecticut Fairfield County Brookfield ⓘ U. S. Route 7 Expressway (Danbury line to Iron Works District)	[Sepiolite] Similar samples from identical geology ...
Danbury ⓘ Agstone Company Limestone Quarry	[Sepiolite] Januzzi et al. (1976) +1 other reference
Florida De Soto County ⓘ Dees drill hole	[Sepiolite] USGS Circular 1059 pp129-137
ⓘ Gadsden County	[Sepiolite] Smith et al. (1986)
Polk County ⓘ Central Florida Phosphate Mining District (Bone Valley)	[Sepiolite] Marc V. Hurst (2012)
Georgia Decatur County ⓘ Attapulgus	[Sepiolite] Smith et al. (1986)
Thomas County ⓘ Cherokee Industries Ochlocknee Mine (Anschutz Company; Control Packaging)	[Sepiolite] Cook (1978)
ⓘ Simpson Mine & Mill	[Sepiolite] Cook (1978)
ⓘ Turner Mine	[Sepiolite] Cook (1978)
Union County Trackrock Gap ⓘ Trackrock Mine	[Sepiolite] Ballard (1948)
ⓘ Green River Formation	[Loughlinite] Tank (1972) +1 other reference
Idaho Lemhi County ⓘ Junction Mining District (Little Eightmile Mining District)	[Sepiolite] Ream (2004)
Michigan Marquette County Richmond Township Palmer ⓘ Empire Mine	[Sepiolite] Identified and verified by SEM/EDS and ...
Minnesota Saint Louis County Babbitt ⓘ Northshore Mine (Peter Mitchell Mine; Reserve Mine; Babbitt Mine)	[Sepiolite] Ross (2007)
Missouri Washington County ⓘ Pea Ridge Mine	[Sepiolite] Sherwood et al. (1998)
Montana Jefferson County Whitehall Mining District (Cardwell Mining District) ⓘ Bonanza prospect	[Sepiolite] Gnanou (2018)
Golden Sunlight Mine ⓘ North pit	[Sepiolite] Gnanou (2018)
Silver Bow County Butte Mining District (Summit Valley Mining District) ⓘ Berkeley Pit	[Sepiolite] Guilbert and Zeihen 1964 +1 other reference
Nevada Clark County ⓘ Las Vegas Wash	[Sepiolite] Buck et al. (2006)
McClanahan Mining District ⓘ Boulder Canyon	[Sepiolite] Castor et al. (2004)
Spring Mountains ⓘ Goodsprings Mining District	[Sepiolite] Castor et al. (2004)
Elko County Ferber Mining District ⓘ Unnamed prospect	[Sepiolite] Castor et al. (2004)
Esmeralda County ⓘ Rhyolite Ridge Li-B Deposit	[Sepiolite] www.globalgeo.com.au (2018)
Lincoln County ⓘ Pioche Mining District	[Sepiolite] Castor et al. (2004)
Nye County Amargosa Desert ⓘ Ash Meadows Mining District	[Sepiolite] Rocks & Minerals. Nov. 1999.
ⓘ Aschenbrenner Mine	[Sepiolite] Güven et al. (1979)
ⓘ Yucca Mountain	[Sepiolite] Castor et al. (2004)
New Jersey Somerset County Bernards Township ⓘ Millington Quarry	[Sepiolite] Maertens (2007)
Sussex County Franklin ⓘ Franklin Mine	[Sepiolite] Germine (1987) +1 other reference
New Mexico Grant County ⓘ Alum Mountain Mining District (Alum Mining District)	[Sepiolite] McLemore et al. (1996)
ⓘ Juniper Mining District	[Sepiolite] Northrop et al. (1996)
ⓘ Bear Creek Area	[Sepiolite] - (2005)
ⓘ Dorsey claim	[Sepiolite] Northrop et al. (1996)
Meerschaum Mining District ⓘ Meerschaum Shaft	[Sepiolite] USGS Bull 1451
ⓘ Sapillo No. 2 Shaft	[Sepiolite] USGS Bull 1451
ⓘ Sapillo No. 3 Shaft	[Sepiolite] USGS Bull 1451
McKinley County Red Lake volcanic field ⓘ Green Knobs	[Sepiolite] Northrop et al. (1996)
San Juan County ⓘ Chaco Culture National Historical Park	[Sepiolite] Tankersley et al. (2016)
New York ⓘ New York City	[Sepiolite] John H. Betts (2009)
Putnam County Town of Patterson ⓘ Tuckahoe and Patterson Marble Company Quarry	[Sepiolite] New York State Museum collection
St. Lawrence County Edwards Talcville ⓘ Hyatt Mine	[Sepiolite] Rocks & Min. V.71 +1 other reference
Fowler ⓘ Balmat	[Sepiolite] NY State Museum spec. no. 13870
ⓘ Empire State No. 2 Mine	[Sepiolite] Chamberlain et al. (2023)
ⓘ Gouverneur	[Sepiolite] Brindley (1959)
ⓘ North Carolina	[Sepiolite]
Clay County ⓘ Buck Creek ?	[Sepiolite] Hadley et al. (1945)
Jackson County Webster-Balsam ⓘ Webster-Addie ultramafic ring dike	[Sepiolite] Dana et al. (1892)
Oregon Douglas County Riddle Mining District ⓘ Nickel Mountain (Hanna Nickel Mine)	[Sepiolite] - (2005)
Marion County Santiam Mining District (Elkhorn Mining District) Breitenbush-Austin Hot Springs area ⓘ SUNEDCO 58-28 well ?	[Sepiolite] Bargar et al. (1997)
Pennsylvania Chester County West Nottingham Township ⓘ Goat Hill Magnesia Quarries	[Sepiolite] Samuel S. Gordon +1 other reference
ⓘ Delaware County	[Sepiolite] ...
Lancaster County Fulton Township ⓘ Cedar Hill Quarry (Stoltzfuss Quarry)	[Sepiolite] Lapham et al. (1976)
Rhode Island Providence County ⓘ Cumberland	[Sepiolite] Miller
Utah Duchesne County ⓘ Green River Formation outcrops	[Loughlinite] Bullock (1981)
ⓘ Indian Canyon	[Sepiolite] Bullock (1981)
Grand County Little Grand Mining District ⓘ Ten Mile Graben	[Loughlinite] Williams (2017)
Salt Lake County Big Cottonwood Mining District Argenta ⓘ Maxfield Mine	[Sepiolite] Bullock (1981) +1 other reference
ⓘ Little Cottonwood Mining District	[Sepiolite] Bullock (1981)
San Juan County White Canyon Mining District ⓘ Happy Jack Mine (Blue Dike Mine)	[Sepiolite] USGS TEI #514 +1 other reference
Tooele County Gold Hill Mining District (Clifton Mining District) Gold Hill ⓘ Cane Springs Mine	[Sepiolite] Bullock (1981)
Stockton Mining District ⓘ Honerine Mine (Bauer; Bullion Coalition; Great Basin; Tip Top Mine)	[Sepiolite] Bullock (1981)
Uintah County Uteland Knoll Mining District (Ouray Mining District) Ouray ⓘ South Ouray No. 1 well	[Loughlinite] Milton (1977)
Vermont ⓘ Rutland County	[Sepiolite] Rocks & Min. Vol. 71 (1996)
Virginia Augusta County West Augusta ⓘ Stoutameyer Branch (Stotameyer Creek)	[Sepiolite] Robin D. Tibbit (deceased)
Washington Skagit County ⓘ Stephens Mine	[Sepiolite] Rocks & Min.: 14:112-113.
Stevens County Colville Mining District ⓘ Van Stone Mine	[Sepiolite] - (2005)
ⓘ Valley	[Sepiolite] Werner et al. (2006)
Whatcom County Sisters Mining District ⓘ Twin Sisters Mountain	[Sepiolite] Cannon (1975)
Wyoming Sweetwater County Green River Basin ⓘ Westvaco mine	[Loughlinite] Fahey et al. (1960) +1 other reference
ⓘ John Hay Jr. Well No. 1	[Loughlinite] Fahey et al. (1960)
ⓘ Union Pacific Well No. 4	[Loughlinite] Fahey et al. (1960)

Venezuela
Miranda ⓘ Cueva Ricardo Zuloaga	[Sepiolite] Urbani (1996)
ⓘ Unspecified Caves	[Sepiolite] Franco Urbani (2009)

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