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OpenStudy (anonymous):
What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
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OpenStudy ($u$hant):
andesite, a dark, fine-grained volcanic rock, the extrusive equivalent of diorite. Intermediate in composition between basalt and rhyolite, andesite consists mostly of plagioclase feldspar and lesser amounts of biotite or hornblende.(Dark silicate materials)
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