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USA | |
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| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193. |
- Oro Blanco Mining District (Ruby Mining District)
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193. |
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| Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp. |
- Huachuca Mountains Northwestern foothills
| Peirce, H.Wesley (1969), Diatomite, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 337-342. |
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| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.
Lewis, W. Scott (1942), Gem collecting in California: Hobbies: 47: 116-117 |
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| [Opal-A var. Opal-AN] Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 87. |
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| [Opal-A var. Opal-AN] Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 361. |
Jay R claim, Santa Cruz County, Arizona, USA