mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Hardness of 2-2.5 on the Mohs scale, transparent to translucent with a pearly to vitreous luster, sheet silicate (phyllosilicate) structure with perfect basal cleavage allowing it to be split into extremely thin, flexible elastic sheets, specific gravity of 2.77-2.88.
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Physical properties
Hardness of 2-2.5 on the Mohs scale, transparent to translucent with a pearly to vitreous luster, sheet silicate (phyllosilicate) structure with perfect basal cleavage allowing it to be split into extremely thin, flexible elastic sheets, specific gravity of 2.77-2.88.
Formation & geological history
Forms in igneous rocks like granites and pegmatites, as well as metamorphic rocks like schists and gneisses, through the crystallization of cooling magma or regional metamorphism of argillaceous sedimentary rocks.
Uses & applications
Used in electrical insulation, drywall joint compounds, paints, plastics, cosmetics for pearlescent shimmer, and as a thermal and optical window material.
Geological facts
Muscovite was historically known as 'Muscovy glass' because it was used as a substitute for window glass in medieval Russia.
Field identification & locations
Easily identified in the field by its characteristic ability to peel into flexible, transparent sheets with a pearly luster. Commonly found in pegmatite dikes and micaceous schists worldwide.
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