Geology (Unit 2) - Lake George - Cripple Creek Granite

A mining geologist located yttrium fluorite at this locality during World War II. The geologist didn't want collectors to take any of the then very valuable mineral so he completely mined the locality until none was left. This pegmatite is part of the Cripple Creek Granite (1.40-1.43 billion years old), which is older than the Pikes Peak Granite (1.08 Ga). Compare the sample of Cripple Creek Granite below to a sample of Pikes Peak Granite to see the difference.

 
Pegmatite in Cripple Creek Granite
Pegmatite in Cripple Creek Granite
 
Close-up of Cripple Creek Granite
Close-up of Cripple Creek Granite

Last updated: February 24, 2015

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