mineral

Muscovite mica (mica schist fragment)

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly intergrown with quartz and feldspar

AI-generated identification · may be incorrect

Pale silvery-gray, pearly to vitreous luster, platy/flaky texture, and perfect basal cleavage; Mohs hardness 2–2.5, monoclinic crystal structure, specific gravity about 2.8–2.9. The specimen appears sparkly and foliated, consistent with mica-rich metamorphic rock.

Identified August 24, 2026More mineral →

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At a glance

Common name: Muscovite mica (mica schist fragment)
Scientific name: Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly intergrown with quartz and feldspar
Category: mineral
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 for a common rough specimen; larger, exceptionally clean crystal books or aesthetic specimens may sell for $20–$100.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Muscovite commonly forms during regional metamorphism of clay-rich sediments, typically in schist and gneiss, or in granitic pegmatites. Its exact age and locality cannot be determined from the photograph.

Uses & applications

Used in electrical insulation, joint compound, paints, plastics, cosmetics, and heat-resistant materials; attractive flakes are collected but this rough piece has modest value.

Geological facts

Mica splits into extremely thin, flexible, transparent sheets because of its layered silicate structure. Silver muscovite is often called “white mica.”

Field identification & locations

Identify it by elastic sheets, strong basal cleavage, pearly sheen, and low hardness; a steel blade may scratch it easily. Common occurrences include granite pegmatites and metamorphic belts worldwide.