mineral
Muscovite
Muscovite mica, KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectMohs hardness 2-2.5, colorless to pale silver or brown, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage.
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Physical properties
Mohs hardness 2-2.5, colorless to pale silver or brown, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage.
Formation & geological history
Forms in igneous rocks like pegmatites, as well as metamorphic schists and gneisses through regional metamorphism.
Uses & applications
Used in electrical insulation, paints, plastics, cosmetics for pearlescent shimmer, and as a refractory material.
Geological facts
Also known as potash mica, it was historically used as a glass substitute in windows called muscovy glass.
Field identification & locations
Easily identified by its flexible, elastic sheets that peel off in transparent, highly reflective layers.
