Hypertext Webster Gateway: "schist"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Schist \Schist\ (sh[i^]st), n. [Gr. ? divided, divisible, fr. ?
to divide: cf. F. schiste. See {Schism}.] (Geol.)
Any crystalline rock having a foliated structure (see
{Foliation}) and hence admitting of ready division into slabs
or slates. The common kinds are mica schist, and hornblendic
schist, consisting chiefly of quartz with mica or hornblende
and often feldspar.
From WordNet (r) 1.7 (wn)
schist
n : any metamorphic rock that can be split into thin layers
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