Migmatite,  Auvergne, France. Thin section.

 

 

   Migmatite is a partly molten rock consisting of a solidified liquid (clear color) + a refractory residue (dark color).

   The picture below is a crossed polars view of the black part of the rock: the solid  residue. The picture shows amphiboles and weathered feldspars.

 

 

    Plane polarized view.