mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Hardness: 2-2.5 on Mohs scale. Color: Pale green to silvery white/tan, transparent to translucent. Luster: Pearly to vitreous. Crystal system: Monoclinic. Cleavage: Perfect basal cleavage forming flexible, elastic sheets.

Hardness: 2-2
Color: Pale green to silvery white/tan, transparent to translucent
Luster: Pearly to vitreous

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in regional metamorphic rocks like schists and gneisses, as well as in igneous pegmatites and granites under moderate to high temperatures and pressure.

Uses & applications

Widely used as an electrical and thermal insulator, in makeup/cosmetics for shimmer, as a joint compound filler, and in paint manufacturing.

Geological facts

Muscovite was historically used as a glass substitute for windows in medieval Russia, which inspired its name (derived from Muscovy glass). Sheets can be peeled into paper-thin, see-through layers.

Field identification & locations

Identified by its distinctive micaceous structure, allowing it to split into extremely thin, flexible, transparent sheets. Commonly found in pegmatite deposits worldwide (e.g., Brazil, India, USA, Madagascar).