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What kind of rocks are coal, gneiss, and granite, like sedimentary, igneous, or metamorphic?

April 26, 2017Coal gneiss granite igneous metamorphic rocks sedimentary

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What kind of rocks are coal, gneiss, and granite, like sedimentary, igneous, or metamorphic?

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Coal is a sedimentary rock of biochemical origin; gneiss is a high grade metamorphic rock; granite is an igneous rock that is composed of four minerals (quartz, feldspar, mica, and usually hornblende).