mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
Hardness: 2-2.5 on the Mohs scale, Color: Silver, white, grey, or colorless, Luster: Vitreous, pearly, or metallic on cleavage faces, Crystal System: Monoclinic, Cleavage: Perfect basal cleavage allowing it to split into extremely thin, flexible sheets, Specific Gravity: 2.77-2.88
- Hardness
- 2-2
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Physical properties
Hardness: 2-2.5 on the Mohs scale, Color: Silver, white, grey, or colorless, Luster: Vitreous, pearly, or metallic on cleavage faces, Crystal System: Monoclinic, Cleavage: Perfect basal cleavage allowing it to split into extremely thin, flexible sheets, Specific Gravity: 2.77-2.88
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 and hydrothermal processes.
Uses & applications
Used in electrical insulators, paints, plastics, cosmetics for pearlescent shimmer, drywall joint compounds, and as a heat-resistant window material in older stoves.
Geological facts
Muscovite gets its name from 'Muscovy-glass', as it was historically used in medieval Russia as a cheaper alternative to glass for windows.
Field identification & locations
Easily identified in the field by its distinct sheet-like structure, perfect basal cleavage, and shiny, reflective surfaces. Common in pegmatite dikes worldwide.
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