Foliated Metamorphic Rocks

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6 Terms

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Foliated metamorphic rocks

Exhibit a planar fabric due to the alignment of minerals under differential stress Examples include slate, phyllite, schist, and gneiss

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Slate

A low-grade metamorphic rock with a protolith of shale or mudstone, characterized by slaty cleavage

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Phyllite

Forms from slate at higher temperatures, showing neocrystallization of mica and chlorite, resulting in phyllite texture

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Schist

A higher-grade metamorphic rock than phyllite, with larger micas and other minerals, exhibiting schistosity

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Gneiss

A high-grade metamorphic rock with a protolith of schist (or other rocks), characterized by gneissic banding

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Metaconglomerate

A foliated metamorphic rock with a protolith of conglomerate, formed at low-to-mid-grade metamorphism