schist
Noun

schist

  1. Any of a variety of coarse-grained crystalline metamorphic rocks with a foliated structure that allows easy division into slabs or slates.
    • 1890, George Huntington Williams, The Greenstone Schist Areas of the Menominee and Marquette Regions of Michigan, US Geological Survey, Number 62, page 74 ↗,
      Although it shows under the microscope traces of the original gabbro structure and of the original gabbro minerals, no one would hesitate from a microscopical examination to class it with the schists.
    • 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.
    • 2012, Amy Schoeman, Skeleton Coast, page ii ↗
      Millions of years ago the mica schists surrounding the old Brandberg West Mine became folded and concertinaed by enormous horizontal pressures.
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