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(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.

Subjects: Earth Sciences and Geography.

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