Opal from Idaho City Mining District, Boise County, Idaho, USA
USA | |
| [var. Fire Opal] Dake, H. C. (1956) Northwest Gem Trails - A Field Guide for the Gem Hunter, Mineral Collector and Tourist (2nd ed.) Gembooks. |
USA | |
| [var. Fire Opal] Dake, H. C. (1956) Northwest Gem Trails - A Field Guide for the Gem Hunter, Mineral Collector and Tourist (2nd ed.) Gembooks. |