Gneis - Types - Augen Gneiss

Augen Gneiss

Augen gneiss, from the German: Augen, meaning "eyes", is a coarse-grained gneiss, interpreted as resulting from metamorphism of granite, which contains characteristic elliptic or lenticular shear bound feldspar porphyroclasts, normally microcline, within the layering of the quartz, biotite and magnetite bands.

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