| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Iowa > Calcite |
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| DESCRIPTION: | No. 77418 |
| Mineral: | Calcite |
| Locality: | Oskaloosa area coal mines, Mahaska County, Iowa |
| Description: | Lustrous dark brown-black calcite crystals covering two sides of dense dark-gray slate-like matrix. The calcite crystals are rhombohedral form and exhibit brown translucency when strongly illuminated. Collected ca. 1970 |
| Overall Size: | 9x9x6 cm |
| Crystals: | 2-4 mm |
| Archived: | For reference only |
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