Apatite from selected localities.
USA | |
| U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Ross, C. S. (1941) Occurrence and origin of the titanium deposits of Nelson and Amherst Counties, Virginia. USGS Professional Paper 198 | |
| Rocks & Minerals:60:167. |
Ross, C. S. (1941) Occurrence and origin of the titanium deposits of Nelson and Amherst Counties, Virginia. USGS Professional Paper 198 |