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Summary
DescriptionMineral content of igneous rocks.svg
English: Graph of mineral content, by percentage, of various igneous rocks. The dotted line on the figure represents one such value, where roughly 2% quartz, 6% alkali feldspar, 54% plagioclase feldspar, 2% pyroxene, 21% amphibole, and 15% mica suggests a rock of intermediate composition, either andesite or diorite (depending on crystal size and other factors).
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