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Devil's Playground, pegmatites
Utah

"small magma bodies intruded into the granitic rock forming pegmatites (coarse-grained igneous rocks with interlocking quartz crystals, usually found as irregular dikes or veins). The pegmatites are fairly common, several inches in thickness, and extend hundreds of feet. They represent the last and most hydrous (waterrich) portion of magma to crystallize. The pegmatites are easy to locate because they are more resistant than the surrounding rock, thus they resemble ribs and bones sticking out in relief."

See: http://geology.utah.gov/surveynotes/geosights/devils_playground.htm

Copyright: Calvin jones
Type: Spherical
Resolution: 13972x6986
Chargée: 01/06/2012
Mis à jour: 10/07/2014
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Tags: pegmatites; granitic rock; blm; box elder; utah
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More About Utah

Utah is a state located in the westcentral region of the United States of America.  Utah is the 13th largest state by area, ranks 34th by population and 10th by population density of the 50 United States.  Utah was the 45th state to be admitted into the Union, on January 4, 1896. Utah is landlocked, being bordered by the states of Idaho to the north, Wyoming to the northeast, Nevada on the west, Colorado on the east and Arizona to the south.  Utah is very mountainous and is a popular outing destination of the outdoorsman.  The state population is about 2.82M with 95% being Caucasian, 2.4% Asian, 1.7% Native American and 1.3% Black. The state capital and largest city is Salt Lake City.Source: wikipedia