View source for Mica fish

{{Short description|Roughly fish-shaped mica crystal}}
[[File:Mica-fish.jpg|thumb|[[Thin section]] of a mica fish in mylonitic quartzite from the Italian Alps]]
'''Mica fish''' are lenticular, elongate lozenge, parallelogram-shaped, or lens-shaped (roughly fish-shaped) single [[mica]] [[crystal]]s that are often used as [[shear (geology)|shear]] sense indicators.<ref>[http://archimed.uni-mainz.de/pub/2001/0033/diss.pdf Mica fish in mylonites]</ref> They commonly occur in micaceous quartzitic [[mylonite]]s. They characteristically lie with their longest dimension at a small angle to the mylonitic [[Foliation (geology)|foliation]].
==References==
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[[Category:Metamorphic petrology]]
[[Category:Structural geology]]
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