Etymology
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schist (n.)

type of closely layered metamorphic rock, 1784 (earlier schistus, c. 1600), from French schiste (16c.), from Latin schistos lapis "stone that splits easily" (Pliny), from Greek skhistos "divided, separated," from skhizein "to split" (from PIE root *skei- "to cut, split"). The rock splits easily in layers. Related: Schistic.

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Definitions of schist

schist (n.)
any metamorphic rock that can be split into thin layers;
From wordnet.princeton.edu