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