ES2 Metamorphic Rocks - Metamorphic Microstructures #7
Kink-folding in mica.
This large biotite grain has responded to deformation by developing kink-like folds rather than recrystallising. In contrast, the quartz in the same rock is about 80% recrystallised into strain-free polygonal grains. Note the old strained quartz grain at top right.

Crossed polars. Field of view is 2.5 mm across.

Mica schist, Eastern Alps, Sample AK-1

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DJW - August 1997