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Full Definition of SCHISM. 1. 2. a: formal division in or separation from a church or religious body b: the offense of promoting schism. See schism defined for English-language learners.
Schist (pronounced /ÊÉªst/ SHIST) is a medium-grade metamorphic rock with medium to large, flat, sheet-like grains in a preferred orientation (nearby grains are roughly parallel). It is defined by having more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.