mineral
Muscovite
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectMohs hardness 2-2.5, white to colorless with pearly luster, monoclinic crystal system, perfect basal cleavage, specific gravity 2.7-3.0.
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Physical properties
Mohs hardness 2-2.5, white to colorless with pearly luster, monoclinic crystal system, perfect basal cleavage, specific gravity 2.7-3.0.
Formation & geological history
Forms in igneous rocks like granite and pegmatites, as well as metamorphic schists and gneisses through regional metamorphism.
Uses & applications
Used in electrical insulators, paints, plastics, and drywall joint compounds due to its heat resistance and insulating properties.
Geological facts
Also known as common mica, it was historically used as a glass substitute in windows, particularly in Russia where it was called Muscovy glass.
Field identification & locations
Easily identified by its ability to split into extremely thin, flexible, transparent sheets. Found worldwide in pegmatite dikes and metamorphic terrains.
