|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Iowa > 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|
|Archived:||For reference only|
|Buy similar:||Minerals from Midwest, USA > Calcite Specimens|
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