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Metamorphic rock

Phyllite

Low to medium grade, hotter than slate, from mudrock. Larger micas give a satiny sheen, and the cleavage is slightly wavy.

Phyllite hand sample and outcrop
Phyllite hand sample and outcrop. Karla Panchuk (2018), CC BY-SA 4.0. Source

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More photos and thin sections

Alex Strekeisen: Phyllite

Other metamorphic rocks

Slate · Schist · Gneiss · Amphibolite · Marble · Quartzite · Hornfels · Migmatite

Sources

Panchuk, Physical Geology 10.3: Classification of Metamorphic Rocks