| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Michigan > Copper |
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| DESCRIPTION: | No. 45311 |
| Mineral: | Copper |
| Locality: | Hecla Mine, Calumet, Keweenaw Peninsula Copper District, Houghton County, Michigan |
| Description: | Crystallized mass of native copper with bright patina that resembles silver. But specific gravity tests confirm it is copper. The copper is in sharp crystals with both blocky and elongated habit. |
| Overall Size: | 23x15x3 mm |
| Crystals: | 0.5-3.5 mm |
| Archived: | For reference only |
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