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USA | |
| [var. Manganese-bearing Calcite] Rocks & Min 70:5 pp 298-310 |
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| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Rob Lavinsky photo |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
Idarado Mine, Ouray County, Colorado, USA