| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Michigan > Copper var. Spinel-law Twin Crystals |
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| DESCRIPTION: | No. 30137 |
| Mineral: | Copper var. Spinel-law Twin Crystals |
| Locality: | Keweenaw Peninsula Copper District, Michigan |
| Description: | Elongated specimen of sharp, well defined copper crystals. Many of the crystals exhibit twinning on the (111) plane following the Spinel-law and resulting in complex crystal form. Remnants of old museum number are visible on one side. |
| Overall Size: | 55x15x12 mm |
| Crystals: | 2-12 mm |
| Archived: | For reference only |
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