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schist

[shist] /ʃɪst/
noun
1.
any of a class of crystalline metamorphic rocks whose constituent mineral grains have a more or less parallel or foliated arrangement.
Origin
1775-1785
1775-85; < New Latin schistus, Latin (lapis) schistos < Greek schistós divided, curdled, divisible, derivative of schízein to split, with -tos adj. suffix
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for schists
  • Porphyritic rocks occur between the schists and the quartzites.
British Dictionary definitions for schists

schist

/ʃɪst/
noun
1.
any metamorphic rock that can be split into thin layers because its micaceous minerals have become aligned in thin parallel bands
Derived Forms
schistose, adjective
schistosity (ʃɪˈstɒsɪtɪ) noun
Word Origin
C18: from French schiste, from Latin lapis schistos stone that may be split, from Greek skhizein to split
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for schists

schist

n.

type of layered metamorphic rock, 1795 (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" (see shed (v.)). The rock splits easily in layers. Liddell and Scott says Greek skhistos lithos was "probably talc."

Online Etymology Dictionary, © 2010 Douglas Harper
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schists in Science
schist
  (shĭst)   
A highly foliated, medium-grained metamorphic rock that splits easily into flakes or slabs along well-defined planes of mica. The mineral composition of schist is varied and is often reflected in the name given to the rock. For example, a schist that contains garnet is called a garnet schist. A schist containing chlorite is called a chlorite schist.

schistose adjective (shĭs'tōs')
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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