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Andesite, Sutter Buttes, California

Gallery of Volcanic Rocks


Andesite (specimen from Sutter Buttes) is more siliceous and less fluid than basalt. Large light phenocrysts are potassium feldspar. Andesite can also be red.
A typical chunk
Photo (c) 2007 Andrew Alden, licensed to About.com (fair use policy)
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