mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness 2-2.5 on Mohs scale, colorless to grey or brownish, pearly to vitreous luster, perfect basal cleavage yielding flexible elastic sheets, specific gravity 2.7-3.0.
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Physical properties
Hardness 2-2.5 on Mohs scale, colorless to grey or brownish, pearly to vitreous luster, perfect basal cleavage yielding flexible elastic sheets, specific gravity 2.7-3.0.
Formation & geological history
Forms in igneous rocks like granites and pegmatites, as well as metamorphic schists and gneisses, through hydrothermal activity and regional metamorphism.
Uses & applications
Used in electrical insulators, paints, plastics, drywall joint compound, and cosmetics for its pearly sheen.
Geological facts
Muscovite is the most common member of the mica family and was historically used as a glass substitute in windows, known as muscovy glass.
Field identification & locations
Easily identified in the field by its distinct sheet-like structure and extreme cleavage allowing it to be peeled into transparent flakes.
