igneous
Muscovite in Pegmatite
KAl2(AlSi3O10)(F,OH)2
AI-generated identification · may be incorrectMohs hardness 2-2.5, silver-white to greyish color with a pearly to vitreous luster, monoclinic crystal system with perfect basal cleavage yielding flexible sheets.
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Physical properties
Mohs hardness 2-2.5, silver-white to greyish color with a pearly to vitreous luster, monoclinic crystal system with perfect basal cleavage yielding flexible sheets.
Formation & geological history
Formed during the late stages of crystallization of granitic magmas in pegmatite dykes, typically Precambrian in age.
Uses & applications
Used in electrical insulation, paints, plastics, and as a mineral specimen for collectors.
Geological facts
Muscovite is the most common member of the mica group and was historically used as window glass.
Field identification & locations
Identified by its distinctive sheet-like cleavage and sparkling metallic to pearly luster; found worldwide in pegmatites.
