MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
Hand sample of Diorite, an intrusive igneous rock consisting of sodic plagioclase feldspar and hornblende, biotite or pyroxene. Small amounts of quartz may be present. Diorite has phaneritic texture; mineral grains are of nearly equal size and are visible to the naked eye.
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