mineral
Muscovite
Muscovite mica, KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectMohs hardness of 2 to 2.5, translucent to transparent, pearly to vitreous luster, and monoclinic crystal system with perfect basal cleavage.
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Physical properties
Mohs hardness of 2 to 2.5, translucent to transparent, pearly to vitreous luster, and monoclinic crystal system with perfect basal cleavage.
Formation & geological history
Forms in igneous rocks like pegmatites, as well as metamorphic rocks like schists and gneisses through regional metamorphism of argillaceous rocks.
Uses & applications
Used in electrical insulators, drywall joint compounds, paint fillers, and cosmetics for its pearly sheen.
Geological facts
Muscovite is the most common mineral of the mica family and was historically used as a glass substitute called muscovy glass.
Field identification & locations
Easily identified in the field by its ability to peel into extremely thin, flexible, elastic sheets.
