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Andesite, Sutter Buttes, California

Gallery of Volcanic Rocks

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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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