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phylliteA metamorphosed mudstone with a silky sheen, more coarse-grained than a slate and less coarse-grained than a schist.
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2 |
phylliteA very fine-grained, foliated
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3 |
phylliteA very fine-grained, foliated metamorphic rock, generally derived from shale or fine-grained sandstone. Phyllites are usually black or dark gray; the foliation is commonly crinkled or wavy. Differs from less recrystallized slate by its sheen, which is produced by barely visible flakes of muscovite (mica).
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4 |
phylliteA cleaved metamorphic rock midway between slate and schist.
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