ES2 Metamorphic Rocks - Metamorphic Microstructures #9
This rock has a schistose fabric defined by a strong alignment of mica flakes. Since the shapes of mica flakes are controlled by the well-developed {001} crystal form, this is an example of lattice preferred orientation in addition to the dimensional preferred orientation of the flakes.

Crossed polars. Field of view is 2.5 mm across.

Sample DW0524, Austrian Eastern Alps

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DJW - August 1997