mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness of 2 to 2.5 on the Mohs scale, silvery-green to colorless, pearly to vitreous luster, monoclinic crystal system, and exhibits perfect basal cleavage allowing it to split into extremely thin, flexible sheets.
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Physical properties
Hardness of 2 to 2.5 on the Mohs scale, silvery-green to colorless, pearly to vitreous luster, monoclinic crystal system, and exhibits perfect basal cleavage allowing it to split into extremely thin, flexible sheets.
Formation & geological history
Forms in igneous rocks like granites and pegmatites, as well as in metamorphic schists and gneisses through regional metamorphism.
Uses & applications
Used widely in electrical insulators, drywall joint compounds, paints, plastics, and cosmetics for its pearly sheen.
Geological facts
Muscovite is the most common mineral in the mica family and was historically used as a glass substitute in lantern windows called 'muscovy glass'.
Field identification & locations
Easily identified in the field by its distinct sheet-like cleavage and flexible, elastic flakes. Commonly found in pegmatite dikes worldwide.
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