pelite
pelite (adj. pelitic) An aluminium-rich, metamorphic rock formed by the metamorphism of clay-rich sedimentary rocks, e.g. shales and mudstones. The type of aluminium-bearing silicate minerals seen in the rock depends on the pressure and temperature of the metamorphism but usually includes one of the mica group minerals. Quartz is ubiquitous in pelites.
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pelite
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pelite