schist

Any of a variety of coarse-grained crystalline metamorphic rocks with a foliated structure that allows easy division into slabs or slates.

Pronounced as (IPA)
/ʃɪst/
Etymology

From French schiste, from Latin schistos lapis (“the stone that is easy to split”), from Ancient Greek σχιστός (skhistós, “splittable”), from σχίζω (skhízō, “to split”).

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