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A cohesive fault-rock which is characterised by tectonic reduction of grain size and recrystallisation, and commonly contains lensoidal to rounded porphyroclasts and lithic fragments of similar composition to minerals in the matrix.

A compact, chert-like rock without cleavage, but with a streaky or banded structure, produced by the extreme granulation and shearing of rocks that have been pulverized and rolled during overthrusting or intense dynamic metamorphism. Mylonite may also be described as a microbreccia with flow texture.

See Also: cataclasite, protomylonite, mylonite gneiss, ultramylonite

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Classification of MyloniteHide

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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

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