of, resembling, or in the form of schist.
Also, schistous [shis-tuhs] .

1785–95; schist + -ose1

schistosity [shi-stos-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
schist (ʃɪst)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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')
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Blue, thin-bedded, finely crystalline schistose limestone and calcareous slate.
Two generations of cleavage are evident in the more schistose rocks, the older schistosity being transected by a slip cleavage.
The western part of these metamorphic rocks are mainly phyllite, grading eastward into quartzitic and schistose rocks.
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