mineral

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

AI-generated identification · may be incorrect

Pale gold to silvery, pearly sheen, and thin flaky sheets with perfect basal cleavage; Mohs hardness 2–2.5, monoclinic crystal structure, specific gravity about 2.8–2.9. The specimen’s appearance is consistent with mica, though an image alone cannot confirm the identification.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-rich igneous rocks such as granite and pegmatite, and in metamorphic rocks such as schist; crystals grow during magma cooling or metamorphism. It occurs in rocks spanning a wide range of geological ages.

Uses & applications

Used as an electrical and thermal insulator, in some paints and cosmetics, and as a collectible mineral; this small rough piece has little jewelry or construction use.

Geological facts

Mica’s sheets split into exceptionally thin, flexible layers, a property that historically made muscovite useful for window panes.

Field identification & locations

Look for shiny, sheet-like flakes that peel along flat surfaces; common sources include granites, pegmatites, and schists worldwide. The pictured grain size and color are suggestive, not diagnostic.