|
USA | |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| The Northern Virginia Mineral Club (2009) Field trip |
- Southern Section-Blue Ridge Province
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Rocks & Min.: 60:166. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
- Virgilina Mining District
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Brander Robinson Collection |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| D. M. Schlegal (1959) Gem Stones of the United States. USGS Bulletin 1042G |
- Northern Section-Blue Ridge Province
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Bishop Mine, Lynch Station, Campbell County, Virginia, USA