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USA | |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row. |
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| Erd, Richard C., Greenberg, Seymour S. (1960) Minerals of Indiana. Bulletin 18. Indiana Geological Survey |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
|
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
|
| Lowe, EN (1919) Mississippi its geology, geography, soils and resources. Mississippi State Geological Survey, Bulletin 14 |
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| [Opal-A var. Opal-AN] Sherwood, Mark D., Williams, Glenn A. (1998) Missouri Mineral Locality Index. Rocks & Minerals, 73 (2) 98-117 doi:10.1080/00357529809603046 |
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| [Opal-A var. Opal-AN] Rocks & Min.: 20:61. |
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| [Opal-A var. Opal-AN] Jensen (1978) Minerals of New York State |
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| Rocks & Minerals 85:250-259 |
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| Carlson, Ernest H. (2015) Minerals of Ohio. Bulletin 69 (2nd ed.) Ohio Division of Geological Survey |
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| John Krygier specimens |
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| [Opal-A var. Opal-AN] R&M 72:4 pp 252-264 |
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| Paris, Travis A. (2011) Tennessee Mineral Locality Index. Rocks & Minerals, 86 (4) 300-329 doi:10.1080/00357529.2010.517132 |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey.
U.S Geological Survey, Reston, Virginia |
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| www.austingemandmineral.org |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622
http://www.omsinc.org/archives/Ore-cutts_Jan04.pdf |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
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| [Opal-A var. Opal-AN] Personally collected by Franklin Roberts |
|
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
|
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
|
| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
- Kingsland Granite Company Quarry (Petrick Quarry)
| [Opal-A var. Opal-AN] Self-collected by Franklin Roberts. |
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| [Opal-A var. Opal-AN] Plumlee, Geoffrey S., Whitehouse-Veaux, Pamela Heald (1994) Mineralogy, paragenesis, and mineral zoning of the Bulldog Mountain vein system, Creede District, Colorado. Economic Geology, 89 (8). 1883-1905 doi:10.2113/gsecongeo.89.8.1883
November 1964
v. 59
no. 7
American Mineralogist 50:284 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
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| Onac, B., Veni, G. & White, W. B. (2001). Depositional environment for metatyuyamunite and related minerals from Caverns of Sonora, TX (USA). European Journal of Mineralogy, 13(1), 135-143. |
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| West Virginia Geological & Economic Survey |
Woodward Ranch, Alpine, Brewster County, Texas, USA