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Monastery, east of Estes Park, CO.  Pegmatite sill  intruded into "country rock," the metamorphic basement rock of Colorado. The basement rocks and sills were later faulted into horizontal positions.  Pegmatites are coarse/large grained granitic masses with large crystals of quartz, feldspar, and tourmaline.
ID 106356662

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lin murphy
Feb 11, 2009
Monastery, east of Estes Park, CO. Pegmatite sill intruded into "country rock," the metamorphic basement rock of Colorado. The basement rocks and sills were later faulted into horizontal positions. Pegmatites are coarse/large grained granitic masses with large crystals of quartz, feldspar, and tourmaline.  

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