Augen Gneiss
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Augen Gneiss is a foliated metamorphic rock with large crystals of lenticular or eliptical shear bound microcline.
Augen gneiss, from the German: Augen meaning "eyes", is a coarse-grained gneiss 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. Specimens are supplied in labelled card trays.
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