Opal from Alabama, USA
USA | |
| [Opal-AN var. Hyalite] Barwood, H. (1974) Iron Phosphate Mineral Locality at Indian Mountain, Alabama. The Mineralogical Record: 5(5): p. 242. |
| [Opal-AN] Cook, Robert B., Smith, W. Everett (1982) Mineralogy of Alabama. Bulletin 120. Geological Survey of Alabama |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Rocks & Min. (2007) 82:235-236 |
Indian Mountain, Cherokee County, Alabama, USA