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Online Mineral Museum Archive of Mineral Photographs and Mineral Descriptions from John Betts - 
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Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

 
Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

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
Status: Sold - Posted here for reference only
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