mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Hardness: 2-2.5 on Mohs scale; Color: Colorless, silvery, or light brown; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.76-3.00

Hardness: 2-2
Color: Colorless, silvery, or light brown
Luster: Pearly to vitreous

Identified July 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in igneous rocks like pegmatites and granites, as well as metamorphic rocks such as schists and gneisses through regional metamorphism.

Uses & applications

Used as an electrical insulator in electronics, as a dry lubricant, in paints and cosmetics for shimmer, and in joint compounds for drywall.

Geological facts

Historically, muscovite was used as a glass substitute for windows in Russia, leading to the name 'Muscovy glass.' Because it is heat-resistant, it was later used for wood stove windows.

Field identification & locations

Identified in the field by its distinct ability to be peeled into flexible, elastic, paper-thin transparent sheets. Found globally in mountainous regions with granitic intrusions.