schist

[shist]
noun
any of a class of crystalline metamorphic rocks whose constituent mineral grains have a more or less parallel or foliated arrangement.

Origin:
1775–85; < Neo-Latin schistus, Latin (lapis) schistos < Greek schistós divided, curdled, divisible, derivative of schízein to split, with -tos adj. suffix

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World English Dictionary
schist (ʃɪst)
 
n
any metamorphic rock that can be split into thin layers because its micaceous minerals have become aligned in thin parallel bands
 
[C18: from French schiste, from Latin lapis schistos stone that may be split, from Greek skhizein to split]
 
'schistose
 
adj
 
schistosity
 
n

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Etymonline
Word Origin & History

schist
1795 (earlier schistus, 1601), from Fr. schiste, from L. schistos lapis "stone that splits easily" (Pliny), from Gk. skhistos "divided, separated," from skhizein "to split" (see shed (v.)). The rock splits easily in layers. Liddell and Scott says Gk. skhistos lithos was "probably talc."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
schist   (shĭst)  Pronunciation Key 
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')
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Example sentences for schists
Porphyritic rocks occur between the schists and the quartzites.
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