Metamorphic rock
Slate
Low-grade metamorphic rock from shale. Microscopic clay and mica crystals grow perpendicular to the maximum stress, giving slaty cleavage that splits into flat sheets.
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More photos and thin sections
Other metamorphic rocks
Phyllite · Schist · Gneiss · Amphibolite · Marble · Quartzite · Hornfels · Migmatite
Sources
Panchuk, Physical Geology 10.3: Classification of Metamorphic Rocks