Mica fish in schist

Mica fish in schist

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Mica fish are single crystals of mica, most often biotite, with an elongate, lozenge- or lens-like form, mostly as inclusions in micaceous-quartzitic mylonites and ultramylonites. Mylonites are metamorphic rocks, formed by intense recrystallization combined with ductile deformation, resulting in a fine grain size of the rock and a foliated texture. Mica fish often serve well as shear sense indicators.

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Keywords: biotite, deformation, ductile, foliation, metamorphic rock, mica, mica fish, mylonite, recrystallization

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