Opal-AN from Cumberland, Providence County, Rhode Island, USA
USA | |
| Gems & Minerals 395 (August, 1970). |
Eckert, Allan W. (1997): The World of Opals, p. 346. |
USA | |
| Gems & Minerals 395 (August, 1970). |
Eckert, Allan W. (1997): The World of Opals, p. 346. |