mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
AI-generated identification · may be incorrectMohs hardness 2-2.5, silver-white or grey color, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage yielding flexible elastic sheets, specific gravity 2.7-3.0.
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Physical properties
Mohs hardness 2-2.5, silver-white or grey color, pearly to vitreous luster, monoclinic crystal system, perfect basal cleavage yielding flexible elastic sheets, specific gravity 2.7-3.0.
Formation & geological history
Formed in igneous pegmatites, metamorphic schists and gneisses, and some sedimentary sandstones through crystallization from hydrothermal fluids or regional metamorphism.
Uses & applications
Used in electrical insulators, paints, plastics, drywall joint compound, and cosmetics for its pearly sheen and heat resistance.
Geological facts
Muscovite is the most common mineral of the mica family and was historically used as a glass substitute in stove windows called muscovy glass.
Field identification & locations
Easily identified by its distinctive sheet-like cleavage and ability to peel into thin, flexible, transparent layers. Commonly found globally in pegmatite veins.
