Any of a variety of coarse-grained crystalline metamorphic rocks with a foliated structure that allows easy division into slabs or slates.
1915, Charles Will Wright, Geology and Ore Deposits of Copper Mountain and Kasaan Peninsula, Alaska, US Geological Survey, Professional Paper 87, page 29,
Narrow bands of schist are interstratified with these limestones, and in turn narrow beds of limestone are interstratified with the schists.
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