1. Clayey metamorphic rock with rock cleavage intermediate between slate and schist. Commonly formed by the regional metamorphism of shale or tuff. Micas characteristically impart a pronounced sheen to rock cleavage surfaces. Has phyllitic cleavage.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. A metamorphic rock, intermediate in grade between slate and mica schist. Minute crystals of sericite and chlorite impart a silky sheen to the surfaces of cleavage (or schistosity). Phyllites commonly exhibit corrugated cleavage surfaces. CF: illite; phyllonite. AGI
    b. A general term for minerals with a layered crystal structure. AGI
    c. A general term used by some French authors for the scaly minerals, such as micas, chlorites, clays, and vermiculites.
    Source: Dictionary of Mining, Mineral, and Related Terms











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