mineral

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

AI-generated identification · may be incorrect

Silvery to pale gray, vitreous-to-pearly luster, and perfect basal cleavage into thin flexible sheets; Mohs hardness 2–2.5. Monoclinic mica with low specific gravity (about 2.8–2.9).

Identified October 5, 2026More mineral →

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Physical properties

Silvery to pale gray, vitreous-to-pearly luster, and perfect basal cleavage into thin flexible sheets; Mohs hardness 2–2.5. Monoclinic mica with low specific gravity (about 2.8–2.9).

Formation & geological history

Forms during crystallization of silica-rich igneous rocks and metamorphism, especially in granites, pegmatites, schists, and gneisses. Its age depends on the host rock and can range from ancient Precambrian to recent geological periods.

Uses & applications

Used in electrical and thermal insulation, paints, plastics, and cosmetics; attractive sheets and crystals are also collected.

Geological facts

Mica’s exceptionally strong cleavage lets it split into thin, elastic sheets that remain flexible.

Field identification & locations

Look for a shiny, platy specimen that peels into transparent or translucent sheets; common in granitic and metamorphic terrains worldwide. The image is consistent with muscovite, though visual identification alone is not definitive.