Pyroxene Phenocrysts in Peridotite, Klamath Mountains, California
Phenocryst Gallery
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.
Photo (c) 2009 Andrew Alden, licensed to About.com (fair use policy)
Igneous Rock Basics
Minerals and Textures of Igneous Rocks
Other Large Particles in Rocks
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