| NATIVE COPPER in CALUMET CONGLOMERATE, C & H Mine, Calumet, Michigan, 5 x 3.5 x 2 cm | |
 | Slice of Calumet conglomerate showing the Native Copper veins. ex Gil Griffin collection. |
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| NATIVE COPPER in CALUMET CONGLOMERATE, C & H Mine, Calumet, Michigan, 5 x 3.5 x 2 cm | |
| Slice of Calumet conglomerate showing the Native Copper veins. ex Gil Griffin collection. |
|