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Pyroxene Phenocrysts in Peridotite, Klamath Mountains, California

Phenocryst Gallery

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Large grains of pyroxene stud this outcrop of peridotite. Although the groundmass has partially altered to serpentine, the phenocrysts have resisted, at least for now.
Pyroxene in peridotite
Photo (c) 2009 Andrew Alden, licensed to About.com (fair use policy)
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