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foliation
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schistosity

geology
Also known as: schistose foliation

schistosity, mode of foliation that occurs in certain metamorphic rocks as a consequence of the parallel alignment of platy and lath-shaped mineral constituents. It reflects a considerable intensity of metamorphism—i.e., changes resulting from high temperatures, pressures, and deformation.

This article was most recently revised and updated by John P. Rafferty.