AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Iowa > Calcite on Calcite

Calcite on Calcite from Oskaloosa area coal mines, Mahaska County, Iowa

Photo below under shortwave ultraviolet illumination:

Photo below under longwave ultraviolet illumination:

DESCRIPTION:	No. 78188
Mineral:	Calcite on Calcite
Locality:	Oskaloosa area coal mines, Mahaska County, Iowa
Description:	Classic specimen of two generations of calcite on matrix. The first generation is a 7 mm later dark brown crystals, with later growth of transparent orange-brown scalenohedral calcite crystals to 2 mm. The calcite fluoresces under SW-LW UV illumination. Collected ca. 1980
Overall Size:	5.5x5x2 cm
Crystals:	micro to 7 mm
Archived:	For reference only

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