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epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity. Schistosity is a thin layering of the rock produced by metamorphism (a foliation) that permits the rock to easily be split into flakes or slabs less than 5 to 10 mm 1 sp=us thick. This arises from the presence of chlorite or other platy minerals that

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