Chalcedony from selected localities.
USA | |
| Minerals of Virginia 1990 by R. V. Dietrich |
Minerals of Virginia 1990 by R. V. Dietrich | |
| [var: Agate] Rocks & Min.: 8:143-144.; Arthur A. Pegau (1932) Pegmatite Deposits of Virginia. Virginia Geological Survey; Bulletin 33. |