Chalcedony from selected localities.
USA | |
| [var: Agate] Minerals of Colorado (1997) E.B. Eckel |
[var: Agate] Minerals of Colorado (1997) E.B. Eckel |
USA | |
| [var: Agate] Minerals of Colorado (1997) E.B. Eckel |
[var: Agate] Minerals of Colorado (1997) E.B. Eckel |