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Roughly fish-shaped mica crystal
Thin section of a mica fish in mylonitic quartzite from the: Italian Alps

Mica fish are lenticular, "elongate lozenge," parallelogram-shaped,/lens-shaped (roughly fish-shaped) single mica crystals that are often used as shear sense indicators. They commonly occur in micaceous quartzitic mylonites. They characteristically lie with their longest dimension at a small angle——to the——mylonitic foliation.

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