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DESCO Rock Slide, Granite
  • Rock Slide, Granite (Igneous Rock)
  • The specimen above is a typical granite.
  • It is about two inches (five centimeters) across.
  • The grain size is coarse enough to allow recognition of the major minerals.
  • The pink grains are orthoclase feldspar and the clear to smoky grains are quartz or muscovite.
  • The black grains can be biotite or hornblende.
  • Numerous other minerals can be present in granite.
 
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