mineral
Muscovite
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness of 2-2.5 on the Mohs scale, colorless to silver-gray, pearly to vitreous luster, monoclinic crystal system, and perfect basal cleavage yielding flexible sheets.
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Physical properties
Hardness of 2-2.5 on the Mohs scale, colorless to silver-gray, pearly to vitreous luster, monoclinic crystal system, and perfect basal cleavage yielding flexible sheets.
Formation & geological history
Forms in igneous rocks like granites and pegmatites, as well as in metamorphic rocks such as schists and gneisses through regional metamorphism.
Uses & applications
Used in electrical insulation, paints, dry lubricants, and as a filler in plastics and rubber.
Geological facts
Muscovite is the most common member of the mica family and was historically used as a glass substitute in furnace windows.
Field identification & locations
Easily identified in the field by its distinct sheet-like structure and extreme flexibility.
