Mica schist from the Alps, France

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This section of mica schist has been cut along the schistosity plane. The rocks is mainly composed of quartz and biotite. Some biotite crystals lie nearly in the orientation of the cleavage plane.

 and show  an acute bisectrix  image in convergent light examination and  low birefringence colors. Some feldspath with alterations can also be observed.

Plane_Polarized view.