Calcite from selected localities.
USA | |
| U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
| Minerals of Virginia, 1990 by R. V. Dietrich |
Dunn, P.J., Newbury, D. (1983) Loudounite, a new zirconium silicate from Virginia. The Canadian Mineralogist: 21: 37-40.; Lapis 28(12), 9 (2003). | |
Minerals of Virginia, 1990 by R. V. Dietrich | |
Minerals of Virginia, 1990 by R. V. Dietrich |
Old Goose Creek Quarry, Leesburg, Loudoun County, Virginia, USA