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monzodiorite


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A coarse-grained igneous rock consisting of essential plagioclase feldspar, orthoclase feldspar, hornblende, and biotite, with or without pyroxene. Plagioclase is the dominant feldspar making up 60–90% of the total feldspar and varying from oligoclase to andesine in composition. The presence of the orthoclase feldspar distinguishes this rock from a diorite.

Subjects: Earth Sciences and Geography.


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