mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
AI-generated identification · may be incorrectHardness of 2 to 2.5 on the Mohs scale, golden-brown to silver color, pearly to vitreous luster, monoclinic crystal system, and exhibits perfect basal cleavage allowing it to split into extremely thin, flexible sheets. Specific gravity is 2.7 to 3.0.
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Physical properties
Hardness of 2 to 2.5 on the Mohs scale, golden-brown to silver color, pearly to vitreous luster, monoclinic crystal system, and exhibits perfect basal cleavage allowing it to split into extremely thin, flexible sheets. Specific gravity is 2.7 to 3.0.
Formation & geological history
Forms in igneous rocks like granites and pegmatites, as well as in metamorphic schists and gneisses, through the crystallization of silica-rich and aluminum-rich magmas or hydrothermal activity under high pressure.
Uses & applications
Used extensively in electrical insulators, paints, plastics, drywall joint compounds, and cosmetics for its reflective pearlescent sheen.
Geological facts
Muscovite is the most common mineral in the mica family and was historically known as 'muscovy glass' because it was used as a glass substitute in windows in medieval Russia.
Field identification & locations
Easily identified by its shiny, flaky appearance and ability to peel into transparent or translucent elastic sheets. Found worldwide in pegmatite veins and metamorphic terranes.
