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USA | |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico |
- Cap Rock Mountain Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| [var. Precious Opal] (2005) Mineral Resources Data System (MRDS), US Geological Survey. Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| Walstrom, Robert E. (n.d.) Personal communication. |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
- Pinos Altos Mining District
| [Opal-A var. Opal-AN] Identified on specimens obtained at 2009 Tucson micromount symposium |
| Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
- White Signal Mining District
| [Opal-A var. Opal-AN] Northrop, Stuart A., LaBruzza, F.A. (1996) Minerals of New Mexico (3rd ed.) University of New Mexico Press, Albuquerque, NM. |
| NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico |
Cross Mountain Road, Pinos Altos Mining District, Grant County, New Mexico, USA