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Rock Climbing Photo: Fountain Formation in El Dorado Canyon, CO. This p...
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Fountain Formation in El Dorado Canyon, CO. This photo was taken through a polarizing petrographic microscope. The large bent crystal in the middle is mica, derived from Precambrian rock that cores the Rocky Mountains. The other grains include quartz and feldspar.

Submitted By: lin murphy on Feb 2, 2009
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