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USA | |
| Rocks & Min.:60:167. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. Pegau, Arthur A. (1932) Pegmatite Deposits of Virginia. Bulletin 33. Virginia Geological Survey Bulletin 33. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| [var. Illite] (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
| Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. |
Hanover County, Virginia, USA