Abstract
In this paper the writer presents some considerations of the genesis of some cordierites in the cordierite bearing biotite migmatite and in the biotite bearing spinel cordierite oligoclasite and in the garnet bearing cordierite hypersthene biotite gneiss as well. The cordierite occurs as a product between the sheared porphyroclast of the plagioclase and the younger biotite which concentrates at the mechanical movement in the later stage of formation of every metamorphic rock.
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