Opal from Eureka County, Nevada, USA
USA | |
| Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology USGS Bull 1998 |
| Newmont Mining Corporation |
| Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |
Gold Quarry Mine, Maggie Creek Mining Subdistrict, Carlin Trend, Eureka County, Nevada, USA