Opal from selected localities.
USA | |
| [Opal-A var: Opal-AN] No reference listed |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193. |
USA | |
| [Opal-A var: Opal-AN] No reference listed |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 193. |