phyllite

(filīt′)

noun

a type of metamorphic rock having tiny mica grains that give it a luster: it is intermediate in crystal development between slate and schist

See phyllite in American Heritage Dictionary 4

noun
A green, gray, or red metamorphic rock, similar to slate but often having a wavy surface and a distinctive micaceous luster.

Related Forms:

  • phyl·litˈic (fĭ-lĭtˈĭk) adjective

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