Opal from
USA | |
| USGS: Geological Survey Circular 217 |
| [Opal-A var. Opal-AN] |
Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
USA | |
| USGS: Geological Survey Circular 217 |
| [Opal-A var. Opal-AN] |
Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
Glenwood, Sevier County, Utah, USA