Leptynite
Of the Greek leptunô , to thin.
A leptynite is a metamorphic Roche of the gneissic type to fine grain, made up of quartz, alkaline Feldspath, often of Grenat and low in Mica and Amphibole. It is often of clear color and is output in paving stone. Its Foliation is marked little.
A leptynite is resulting from the metamorphism:
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