Muscovite from selected localities.
USA | |
| Roger Howell Collection |
| [var: Sericite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
USA | |
| Roger Howell Collection |
| [var: Sericite] U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |