Opal from Darwin Mining District, Darwin Hills, Inyo County, California, USA
USA | |
| [Opal-A var. Opal-AN] Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 355. |
USA | |
| [Opal-A var. Opal-AN] Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Van Nostrand Reinholt Press: 355. |