Montmorillonite from Rockbridge County, Virginia, USA
USA | |
| Dietrich, R.V. (1985) Lone Jack Quarry, Rockbridge County, Virginia. Rocks & Minerals: 60(4): 157-163. |
Dietrich, R. V. (1990) Minerals of Virginia. Virginia Geological Survey. | |
| Rocks&Min. 47:596 (1972) |