|
Angola | |
| Martins da Pedra collection |
|
Antarctica | |
| Weaver |
| Grew (1984) +1 other reference |
| Mozer (2012) |
|
Argentina | |
- Paso de Indios department
| Raúl Jorge Tauber Larry +2 other references |
| Fernando Gasón Collection |
| Juan Carlos Lodovichi |
| Zucol et al. (2005) |
| Raúl Jorge Tauber Larry (1967) |
| Raúl Jorge Tauber Larry (1967) |
- Coronel Felipe Varela Department
| Raul J. Tauber Larry |
| Aguirre-Urreta (1) |
| Montagne et al. (2014) |
| Tauber |
| Tauber |
| Mirta Quattrocchio (1) |
| Aguirre-Urreta (1) |
| Montagne et al. (2014) |
| Darío G. Lazo |
| Montagna et al. (2014) |
| Montagna et al. (2014) |
| Montagna et al. (2014) |
| Montagna et al. (2014) |
| Tauber |
| Montagne et al. (2014) |
| Tauber |
| Tauber |
| Raul J. Tauber Larry |
| Raúl Jorge Tauber Larry |
| Raúl Jorge Tauber Larry +1 other reference |
| Raúl J. Tauber Larry´s collection |
| Raúl J. Tauber Larry´s collection |
| Raúl Jorge Tauber Larry |
| Raúl Jorge Tauber Larry |
|
Australia | |
| Myatt (1972) |
| Yash Redkar Collection |
| Smith (1999) |
| Matthew Goodwin collection |
| Smith (1999) |
| Cram (2004) |
| Cram (2004) |
| Smith (1999) |
| Smith (1999) |
| Cram (2004) |
| Cram (2004) |
| Smith (1999) |
| Cram (2004) |
| Smith (1999) |
| Smith (1999) |
| Smith (1999) |
| Cram (2004) |
| Smith (1999) |
| Henley et al. (2001) |
| Henley et al. (2001) |
| Chalmers (1961) |
| Brown et al. (1997) |
| Smith (1999) |
| Colin Merriman Collection |
| Joel Williams Collection |
| |
| Paix (1968) |
| Jensen (1912) |
| Rix (1964/94) |
| Conran et al. (2003) |
| - (n.d.) |
| |
| Paul De Bondt collection. +1 other reference |
| Francis (2013) |
- Central Highlands municipality
| Keith Lancaster - Minerals and ... |
- Derwent Valley municipality
| [Opalised Wood] R Bottrill |
| Allchin et al. (1984) |
| Allchin et al. (1984) |
| Bacon |
- Glamorgan Spring Bay municipality
| Bottrill et al. (2008) |
| Peter Andersen collection |
| Lancaster |
| M Latham Collection |
| Bottrill & Baker |
| Bacon et al. (amended and reprinted 2012) |
| Bacon et al. (amended and reprinted 2012) |
- Meander Valley municipality
| Keith Lancaster - Minerals and ... +1 other reference |
| Douglas J.G. et al. (1988) |
| |
| Birch et al. (1993) |
|
Austria | |
| Mörtl (2000) |
| Mineralienatlas.de +1 other reference |
| Carolus Clusius (1601) |
| www.geopark-karnische-alpen.at (n.d.) |
| Niedermayr et al. (1995) |
| Harald Schillhammer |
| Erwin Löffler collection |
| KNOBLOCH (2012) |
| Exel (1993) |
- Sankt Pölten-Land District
| Knobloch (2004) |
| Exel (1993) |
| Lang. L. (2006) |
| Neschen (n.d.) |
| Hermann (1968) |
| Hermann Kohl |
- Ried im Innkreis District
| Zirkl (1995) |
| Zirkl (1995) |
| Erich Reiter (Braunau, Grieskirchen, Ried, Schärding) |
| Zirkl (1995) |
| Zirkl (1995) |
| Zirkl (1995) |
| Zirkl (1995) |
| Erich Reiter (Bibliothek oberösterreichisches Landesmuseum) |
| Erich Reiter |
| Berger (1953) |
|
Bangladesh | |
| Sen et al. (2012) |
| Sen et al. (2012) |
| Sen et al. (2012) |
|
Belgium | |
| Heirman et al. (2002) |
| Heirman et al. (2002) |
| Heirman et al. (2002) |
| Buttgenbach (1947) +2 other references |
| Van hee (2020) |
| Van hee (2020) |
| Karel Bal Collection |
| ... |
| Heirman et al. (2002) |
| Stockmans et al. (1934) +1 other reference |
| Heirman et al. (2002) |
| H. Knoll Eine Reise durch die fossiele ... |
| Gottwald 2000 |
| Fourmarier (1901) +1 other reference |
| Karel Bal Collection |
| H. Knoll Eine Reise durch die fossiele ... |
| Hatert et al. (2002) +1 other reference |
| Stockmans et al. (1934) |
| Stockmans et al. (1934) |
| Stockmans et al. (1934) |
|
Bolivia | |
| J. T. Singewald Jr. & Edward Berry (1922) |
|
Brazil | |
| Nunes (n.d.) |
| Martins da Pedra collection +1 other reference |
| David Eicher |
| De Bondt (n.d.) |
|
Bulgaria | |
- Mineralni Bani Municipality
| Marcus Voigt Collection |
|
Cambodia | |
| United Nations (1993) |
| United Nations (1993) |
|
Canada | |
| Grice (1989) |
| Phillips (1978) +1 other reference |
|
China | |
- Tongliao City (Tongliao Prefecture)
- Horqin Left Middle Banner
| Yang et al. (2026) |
| ... |
- Changji Autonomous Prefecture (Sanji Autonomous Prefecture)
| XU et al. (2013) |
|
Costa Rica | |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
| Mustoe et al. (2025) |
|
Czech Republic | |
| Purkyně (1927) |
| Purkyně (1927) +1 other reference |
| Purkyně (1927) |
| Purkyně (1927) |
| Pašava et al. (2015) |
| Purkyně (1927) |
| www.rockhound.cz (n.d.) |
|
Denmark | |
| Moler museum |
|
Egypt | |
| Harrell J. (1995) |
|
France | |
| |
| www.brgm.fr (2003) |
| Carles Curto Milá specimen |
| Chauris (2014) |
| Heirman et al. (2002) |
| François Périnet collection |
| François Périnet collection. |
| François Périnet collection. |
| François Périnet collection |
| De Bondt (n.d.) |
| De Bondt (n.d.) +1 other reference |
| Belot (1978) |
| Olivier Mével observation |
- Arrondissement of Le Marin
| Lacroix (1907) |
| Daniël Torro collection |
| Berbain et al. (2005) |
| - (numerous internet sites on petrified wood) |
| Belot (1978) |
- Provence-Alpes-Côte d'Azur
| Heirman et al. (2002) |
|
Georgia | |
| Alexander G. Tvalchrelidze (2003) |
|
Germany | |
| Kaiser (1984) |
| Richter (1977) |
- Neustadt an der Waldnaab District
| Weiß (1990) |
| Heirman et al. (2002) |
| Nickel et al. (1985) |
| Own collection +1 other reference |
| [Opalised Wood] - (n.d.) |
| Dr. Günter Grundmann collection |
| Pawlowski (1991) |
| Haege (1887) |
| O'Donoghue (1976) |
| Weiß (1990) |
| Heirman et al. (2002) |
| Bracke (n.d.) |
| Hartmut Hensel |
| Thomas Kleser |
| Heirman et al. (2002) |
| www.mineralienatlas.de (n.d.) |
| H. Vollstädt et al. (Dresden) |
| Wittern (2001) |
|
Greece | |
- Eastern Macedonia and Thrace
| Voudouris et al. (2018) |
| Heirman et al. (2002) |
| Heirman et al. (2002) |
| Huber (2007) |
| Huber (2007) |
| Huber (2007) |
| Huber (2007) |
| Dernbach (1996) |
|
Hungary | |
- Borsod-Abaúj-Zemplén County
| |
| Szakáll & Gatter: Hungarian Mineral ... |
| |
| |
| |
| |
| |
| Szakáll:100 Hungarian Mineral ... |
| GEODA 2004 |
| Lemanski (n.d.) |
| GEODA 2004 |
| Szakáll: 100 Hungarian Mineral Locality |
| |
| Szakáll et al. (1996) |
| Koch (1985) |
| Koch (1985) |
|
India | |
| Mehrotra et al. (2013) |
| Mehrotra et al. (2013) |
| G. K. Kesar (2011) |
|
Indonesia | |
| Extra Lapis - English No. 10 Opal |
| Collection of Alex Earl |
| Mustoe (2025) |
| Karel Bal Collection |
| De Bondt (n.d.) |
|
Italy | |
- Metropolitan City of Bologna
- Pietracolora (Pietra Colora)
| Roberto Bosi finding +1 other reference |
| www.mineralimodenesi.it (n.d.) |
| Marchesini M. (1999) |
| Marchesini M. (1999) |
| Marchesini M. (1999) |
| Marchesini M. (1999) +1 other reference |
| Marchesini M. (1999) |
| Marchesini M. (1999) |
| Marchesini M. (1999) |
| Marchesini M. (1999) |
| Barelli (1835) +1 other reference |
| Barelli (1835) +1 other reference |
| Barelli (1835) +1 other reference |
| Piccoli et al. (2007) |
| Tiziano Luzi collection |
| Piccoli et al. (2007) |
| De Bondt (n.d.) |
| La Marmora A. [Della Marmora A. +1 other reference |
| La Marmora A. [Della Marmora A. +3 other references |
| Rizzo et al. (2019, July 5th) |
| Sammartino et al. (2011-2012) +1 other reference |
| Sammartino et al. (2011-2012) +1 other reference |
| Bonifazi (2021) |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) +1 other reference |
| Santucci et al. (n.d.) |
| Santucci et al. (n.d.) |
| Rando (1958) +1 other reference |
| Boscardin et al. (1996) |
| Gianfranco Capolupi personal find |
| Boscardin et al. (1996) |
|
Japan | |
| Michael Meder (Ishi-do) |
| - (Special exhibition organized by Masutomi Museum at Osaka show, April-May 2006) |
| Takeo Kato et al. (1934) |
|
Libya | |
| Anthony Ham (2002) |
|
Luxembourg | |
| Werner (1983) |
|
Madagascar | |
| |
| Dernbach (1996) |
| Knut Edvard Larsen info 08.2022 |
|
Mexico | |
- Sierra Mojada Municipality
| Panczner (1987) |
| Panczner (1987) |
|
Mongolia | |
| Pavel M. Kartashov (n.d.) |
| Vakanjac et al. (2026) |
|
Namibia | |
| von Bezing (2007) |
|
Netherlands | |
| Feijen (2022) |
| Heirman et al. (2002) |
|
New Zealand | |
- Thames-Coromandel District
| Jocelyn Thornton (1985) |
| C. Johnson collection |
|
Paraguay | |
| |
|
Poland | |
- Lesser Poland Voivodeship
| Grzegorz Słowik |
| Kubo Kornaga collection |
- Lower Silesian Voivodeship
| Lis et al. (1986) |
| Maria Turnau Morawska (1959) |
- Gmina Kamieniec Zabkowicki
| Kornaga collection |
| Maria Turnau Morawska (1959) |
| Kornaga collection |
| Roemer (1870) |
| Kornaga collection |
| Kuba Kornage collection |
| Kornaga collection |
| PALEOSTONE |
| PALEOSTONE |
| Kornaga (2014) |
- Świętokrzyskie Voivodeship
| J. Jędrychowski - Świętokrzyski raj ... |
|
Portugal | |
| Rui Nunes Collection |
- Freixianda， Ribeira do Fárrio e Formigais
| Tiago Guia collection |
| Nunes (n.d.) |
| Tiago Guia's collection |
| Museu Geológico de Lisboa collection |
|
Romania | |
| CONSTANTINA et al. (2010) |
|
Russia | |
| |
| Heirman et al. (2002) |
| Shumilov (2008) |
| Пекин (2010) +1 other reference |
| Пекин (2010) +1 other reference |
| Пекин (2010) +1 other reference |
| Пекин (2010) +1 other reference |
| Pakhnevich et al. (2023) |
|
Serbia | |
| Miladinović et al. (2016) |
|
Slovakia | |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Gerard van der Veldt collection |
| Pauliš |
- Banská Štiavnica District
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Wood Opals From Velky Dur |
| Koděra et al. (1986) |
- Vranov nad Topľou District
| Duda et all. |
| S.Šimko |
|
South Africa | |
- Ngaka Modiri Molema District Municipality
- Ditsobotla Local Municipality
| Wilson et al. (2006) |
| Wilson et al. (2006) |
|
South America | |
| De Bondt (n.d.) |
|
Spain | |
| Fernando Gascón collection |
|
Thailand | |
| Mustoe et al. (2022) |
- Nakhon Ratchasima Province
- Nakhon Ratchasima District
| C. Lemanski (visited, collected & photographed) |
| Mustoe et al. (2022) |
|
Turkey | |
| Yüzbaşıoğlu et al. (2024) |
| public.fotki.com (n.d.) |
|
UK | |
| Heirman et al. (2002) |
| Heirman et al. (2002) |
| Jolyon Ralph (2018) |
|
USA | |
| Mustoe (2025) |
| Ransom (1974) |
| Cook et al. (1982) |
| Ransom (1974) |
| Cook et al. (1982) +1 other reference |
| Betts (n.d.) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| Dean (1995) |
| Betts (n.d.) +1 other reference |
| Dean (1995) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| Cook et al. (1982) |
| USGS of57-0076 |
| Daugherty (1941) +1 other reference |
- Cane Valley Mining District
| Rob Lavinsky |
| Scarborough (1981) |
| Frondel (1958) |
- Black Rock Point Mining District
| Scarborough (1981) |
| Scarborough (1981) |
| Daugherty (1941) +1 other reference |
- Petrified Forest National Park
| Peirce +1 other reference |
| Daugherty (1941) +1 other reference |
- Sanders-Defiance Plateau area (Sanders-Cheto District)
| Scarborough (1981) |
| Gregory (1917) +2 other references |
| Dennis Tryon |
- Stinking Springs Mining District
| AZ Dept. Min. Resources card file +1 other reference |
| Peirce (1969) |
| Schrader (1915) |
| Scarborough (1981) |
| Anthony et al. (1995) |
- Huskon Mines (Huskon group)
| Scarborough (1981) |
| Scarborough (1981) +1 other reference |
| Scarborough (1981) |
| Scarborough (1981) |
| Scarborough (1981) |
| Guild (1910) +1 other reference |
| Tauber (2015) |
- San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts)
| Scarborough (1981) |
| Granger (1962) |
- Vermillion Cliffs Mining District
| rruff.info (n.d.) |
| Scarborough (1981) |
| Scarborough (1981) |
| AZ Dept. Min. Resources Maggie-Riley ... |
| USGS Bull. 871: 359. +1 other reference |
| Robinson (1913) |
| Guild (1910) +1 other reference |
| |
| Guild (1910) +2 other references |
| Tauber (2015) |
| Scarborough (1981) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Scarborough (1981) |
| Anthony et al. (1995) |
- Hopi Buttes Mining District
| Scarborough (1981) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
- Hunts Mesa deposit (Koley No. 2; Sam Charlie No.1; Hunt's Mesa)
| Witkind (1963) |
| Witkind (1963) |
- Jack Brodie channel (Brodie Nos. 4 & 5; Channel No. 55)
| Scarborough (1981) |
| Witkind (1963) |
| Cristofono (n.d.) |
| Scarborough (1981) |
| Scarborough (1981) |
- Agathla Peak (El Capitan)
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Scarborough (1981) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
- Monument No. 1 channel (Channel No. 36)
| Witkind (1963) |
- Nakai Mesa Mining District
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
| Witkind (1963) |
- Petrified Forest Mining District
| King (n.d.) |
| Scarborough (1981) |
| Scarborough (1981) |
| Scarborough (1981) |
| Granger (1962) |
| Cristofono (n.d.) |
| Scarborough (1981) |
| Scarborough (1981) |
| Granger (1962) |
| Scarborough (1981) |
| Peter Haas collection |
| Dennis Tryon |
| Scarborough (1981) |
| Niemuth (1987) |
| Mitchell |
| Mitchell |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| Twenter et al. (1963) |
| Wilson (1933) |
| www.gamineral.org (n.d.) |
| www.gamineral.org (n.d.) |
| Arkansas Geological Survey |
| Murdoch (1966) |
| Murdoch (1966) |
| January +2 other references |
| - (2005) |
| Murdoch (1966) |
| Murdoch (1966) |
- Black Butte Lake (Black Butte Reservoir)
| Butler (1995) |
- Paymaster Mining District
| Strong (1971) |
| Gems& Min. 343:26 (1966) |
| - (2005) |
- El Paso Mountains District
| Dibblee et al. (1952) +4 other references |
| Berkholz |
- Mojave-Rosamond Mining District (Mojave Mining District)
| Lewis (1942) +1 other reference |
| Murdoch (1966) |
| Butler (1995) |
| Butler (1995) |
| Murdoch (1966) |
| Field work: Jake and Dana Harper |
| Murdoch (1966) |
| Murdoch (1966) |
| Beste (2005) |
| |
| Perry |
| - (2005) |
| Rogers (1938) +1 other reference |
| Murdoch (1966) |
| - (2005) |
| Murdoch (1966) |
| Goodyear (1890) +3 other references |
| Murdoch (1966) |
| Murdoch (1966) |
| Eckel et al. (1997) |
| Mustoe (2025) |
| Dennis Tryon |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
- Tallahassee Creek Mining District
| USGS OFR 84-219 +1 other reference |
| USGS OFR 84-219 |
| USGS OFR 84-219 +1 other reference |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
- McInnis Canyons National Conservation Area
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
- Coal Creek Mining District
| USGS Bull 315 |
| Shawe et al. (2011) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Pearl (1958) |
| Brace (1823) |
| Zeitner (1968) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Bishop et al. (1961) |
| Marc V. Hurst (2012) |
| Ransom (1974) |
| Cook (1978) |
| Cook (1978) |
| Cook (1978) |
| Cook (1978) |
| Ransom (1974) |
| Cook (1978) |
| Cook (1978) |
| Cook (1978) |
| Cook (1978) |
| Cook (1978) |
| G Romaine (A Falcon Guide) |
| Bill Hamel Collection. I have collected ... |
| Ream (2004) |
| Dake (1956) |
| Dake (1956) |
| Dake (1956) |
| Beste (2005) |
| Fenner (2020) |
| Kolata et al. (1981) |
| ... |
| |
| Conroy (2023) |
| Ransom (1974) |
| Erd et al. (1960) |
| MacFall (1951) |
| MacFall (1951) |
| MacFall (1951) |
| Paul J. Horick (1974) |
| Paul J. Horick (1974) |
| Paul J. Horick (1974) |
| Smith et al. (2002) |
| Smith et al. (2002) |
| Paul J. Horick (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Robert Hay (1891) |
| Ransom (1974) |
| Ransom (1974) |
| Robert Hay (1891) |
| Ransom (1974) |
| Ransom (1974) |
| F.C. Lanning (1972) |
| Robert Hay (1891) |
| Ransom (1974) |
| Ransom (1974) |
| Zeitner (1968) |
| Ransom (1974) |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Johnson |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Earth Treasures Vol 4 |
| Johnson +1 other reference |
| R&M 69:3 pp 156-162 |
| Rocks & Min.: 20:371. |
| Bernstein (1976) |
| Bernstein (1976) |
| |
| Carl Dietrich |
| Ransom (1974) |
| Blackwell et al. (Jan. - Mar., 1983) |
| www.olemiss.edu (n.d.) |
| Rocks & Min.: 24:256. +1 other reference |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Sherwood et al. (1998) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| "The River Runs North" - A Story of Montana Moss Agate by Tom Harmon (author) |
| Donald Volkman personally collected |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Mustoe (2025) |
| Ransom (1974) |
| Tucker (n.d.) +1 other reference |
| Tucker (n.d.) +1 other reference |
| Tucker (n.d.) +1 other reference |
| Tucker (n.d.) +1 other reference |
| Tucker (n.d.) +1 other reference |
| Pabian (1971) |
| History Nebraska (2020) |
| |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Ransom (1974) |
| Rocks & Minerals (1955) +1 other reference |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Beste (2005) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Kelly Nash Collection (with location info. from specimen collector, Sara Strong) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Ransom (1974) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) +1 other reference |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Pabian (1971) |
| Castor et al. (2004) |
| Willden et al. (1974) |
- Muddy Mountains Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| June Culp Zeitner (1996) |
| Jake Harper - Field work during the ... |
- Fish Lake Valley Mining District
| Castor et al. (2004) |
| Jake & Dana Harper Collection |
| Strong (1971) |
| Mustoe (2025) |
| - (2005) |
| NBMG files No. 50600003 +1 other reference |
| USGS Bull 1538D +1 other reference |
| - (2005) |
| USGS Bull 1538D |
| Castor et al. (2004) |
| USGS Bull 1538D |
| USGS Bull 1538D |
| Castor et al. (2004) |
- WRT Stonetree group ("Dominion Opal Mine")
| Wentzell Revocable Trust |
| Christopher N. Wentzell |
| Christopher Wentzell +1 other reference |
- Virgin Valley Mining District
| - (2005) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Field work and pers comm. Ed Rigel |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
- Red Ridge Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
| Mustoe (2025) |
| Rockhounds Map of Nevada |
| Castor et al. (2004) |
| Ken Coleman Collection |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
- McClellan Mining District
| Castor et al. (2004) |
| Russ Rizzo Collection |
| - (2005) |
| - (2005) |
| - (2005) |
| Castor et al. (2004) |
| Edward Rigel |
| Steve Kuitems specimen. |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Specimens found in Arroyos around Las ... |
| Northrop et al. (1996) |
| U.S. Geological Survey staff (1965) |
| Northrop et al. (1996) |
| NMBMMR Memoir 15 Geology and Technology ... |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Combining Science and Education. Maps ... +1 other reference |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| collected and identified by J. Nemitz |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Elston (1968) |
| Northrop et al. (1996) +1 other reference |
| Northrop et al. (1996) |
- Hot Springs Mining District
| Northrop et al. (1996) |
| - (2005) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| The Mineralogist |
| Genth (1891) |
| Ransom (1974) |
| Johnson et al. (2004) |
| Ransom (1974) |
| Johnson et al. (2004) |
| Genth (1891) +1 other reference |
| Self - Collected Bruce W. Osborne |
| Genth (1891) +1 other reference |
| Alex Earl collection |
| Genth (1891) +1 other reference |
| Genth (1891) +1 other reference |
| Johnson et al. (2004) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Genth (1891) |
| Genth et al. (1881) |
| Genth et al. (1881) |
| Rock and Mineral Collecting in North ... |
| MacFall (1951) |
| PALAIOS et al. (Feb., 1991) |
| Geology of Burke County (North Dakota Geological Survey) +1 other reference |
| Ransom (1974) |
| Rock and Mineral Collecting in North ... |
| Sharen Schaal specimens |
| Rock and Mineral Collecting in North ... |
| Rock and Mineral Collecting in North ... |
| Rock and Mineral Collecting in North ... |
| Rock and Mineral Collecting in North ... |
| Rock and Mineral Collecting in North ... |
| Rock and Mineral Collecting in North ... |
| Geology of Morton County (North Dakota Geological Survey) +1 other reference |
| Ransom (1974) |
| Rock and Mineral Collecting in North ... |
| Rocks & Minerals (1955) |
| Ransom (1974) |
| Carlson (2015) |
| Carlson (1991) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Carlson (2015) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| R&M 72:4 pp 252-264 |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| R&M 72:4 pp 252-264 |
| R&M 72:4 pp 252-264 |
| |
- Greenhorn Mining District
| Koschmann et al. (1968) |
| Koschmann et al. (1968) |
| Koschmann et al. (1968) |
| |
| De Bondt (n.d.) |
| Jake & Dana Harper Collection |
| Phyllis Richardson |
| Gem Trails of Oregon |
| Ariel S Wall |
| people.oregonstate.edu (n.d.) |
| Gregory (1968) |
- Opalite Mining District (McDermitt Mining District)
| Johnson |
| Dake (1956) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Gordon (1922) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Camilla K. McCauley (1964) |
| Zeitner (1964) |
| Ransom (1974) |
| Ransom (1974) |
| Roberts et al. (1965) |
| Roberts et al. (1965) |
| Roberts et al. (1965) |
| Roberts et al. (1965) |
| Ransom (1974) |
| Roberts et al. (1965) |
| Roberts et al. (1965) |
| www1.eere.energy.gov (n.d.) |
| Roberts et al. (1965) |
| Roberts et al. (1965) |
| Ransom (1974) |
| Roberts et al. (1965) |
| Ransom (1974) |
| Paris (2011) |
| Paris (2011) |
| Paris (2011) |
| The Rock Shop-Gatlinburg |
| Paris (2011) |
| Ransom (1974) |
| Paul Broyles collection |
| Smith (1991) |
| BEG University of Texas publication 4301 |
| Smith (1991) |
| Smith (1991) |
| Smith (1991) |
| www.omsinc.org (2008) |
| Ransom (1974) |
| USGS Bullletin 1042-G +1 other reference |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| Ransom (1974) |
| R. Maxwell (1962) |
| BEG University of Texas publication 4301 |
| Smith (1991) |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| Ransom (1974) |
| Smith (1991) |
| Smith (1991) |
| Smith (1991) |
| Ransom (1974) |
| FOSSIL WOOD OF THE OLIGOCENE CATAHOULA ... +1 other reference |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| ... +1 other reference |
| Cherepon |
| BEG University of Texas publication 4301 |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| ... |
| R. Maxwell (1962) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| Ransom (1974) |
| Lavinsky (n.d.) |
| Ransom (1974) |
| Ransom (1974) |
| Mitchell (1987) |
| BEG University of Texas publication 4301 |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| BEG University of Texas publication 4301 |
| Found personally by Paul Broyles +1 other reference |
| Ransom (1974) |
| Ransom (1974) |
| Ransom (1974) |
| Bill Hamel hiked & collected specimens from this area 10/06-07/2017; visually identified agate et al. (~ 5 mile radius) |
- San Rafael Swell Mining District
| - (2005) |
| Collection of Alex Earl |
| Collected by and in the collection of ... |
| Collected by and in the collection of ... |
- Circle Cliffs Mining District
| Bullock (1981) |
| Dayvault (2000) |
- Thompsons Mining District
| I hiked this area in 2023 and 2024 and ... |
| - (2005) |
| U.S. Geological Survey Professional ... |
| U.S. Geological Survey Professional ... |
| U.S. Geological Survey Professional ... |
| - (1974) |
| Mustoe (2025) |
- La Sal Creek Mining District
| Carter et al. (1965) |
| Carter et al. (1965) |
| Carter et al. (1965) |
| Collection of Alex Earl |
| Collection of Alex Earl |
| Collection of Alex Earl |
| Collection of Alex Earl |
- White Canyon Mining District
| Vochten et al. (1998) |
| Collection of Danny Jones |
| Bullock (1981) |
- Kolob Terrace Mining District
| - (2005) |
| Bullock (1981) |
- Silver Reef Mining District
| - (2005) |
| J. F. Smith |
| Collection of Alex Earl |
| Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) |
| Ransom (1974) |
| Dietrich (1990) |
| Dietrich (1990) |
- Richmond-Petersburg Toll Road
| Dietrich (1990) |
| Dietrich (1990) |
| Holland (2006) |
| Dietrich (1990) |
| Dietrich (1990) |
| Virginia Minerals |
| Ransom (1974) |
| Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| Ransom (1974) |
| [Opalised Wood] - (2005) |
| |
| |
| T Douglas Schonewald Collection |
| De Bondt (n.d.) +1 other reference |
| Thomas A. Dillhoff |
| - (2005) |
| Dake (1956) |
| |
| |
| Gorden De'Young collection |
| Mustoe (2025) |
| Zeitner (1968) |
| Zeitner (1968) |
| Zeitner (1968) |
| Ransom (1974) |
| Collected in 2015 during Field Camp. ... |
| Econ Geol (1980) |
| Root (1972) |
| Kuntz American gems and precious stones |
| King (n.d.) |
| Ancient Forests: A Closer Look at ... |
| The Ohio Journal of Science. v54 n4 (July, 1954) |
| D. M. Schlegal (1959) |
|
Vietnam | |
| Böhme M. et al. (2010) |
|
Zimbabwe | |
| De Bondt (n.d.) |
Visit gemdat.org for gemological information about Petrified Wood.
symbol to view information about a locality.
The 
- This locality has map coordinates listed.
- 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).
Povrazník occurrence, Povrazník, Banská Bystrica District, Banská Bystrica Region, Slovakia