metamorphic

Mica-rich pegmatite, likely muscovite schist or granite

Muscovite-dominant quartz–feldspar rock; approximate mica formula KAl₂(AlSi₃O₁₀)(OH)₂

AI-generated identification · may be incorrect

Pale tan, silvery, and translucent with sparkling platy cleavage; mica is very soft (Mohs 2–2.5), while quartz and feldspar are harder (about 6–7). The specimen has a flaky, uneven texture and vitreous to pearly luster; exact identification is limited by the image.

Identified September 12, 2026More metamorphic →

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At a glance

Common name: Mica-rich pegmatite, likely muscovite schist or granite
Scientific name: Muscovite-dominant quartz–feldspar rock; approximate mica formula KAl₂(AlSi₃O₁₀)(OH)₂
Category: metamorphic
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common hand specimen; $20–$75 if unusually large, aesthetic, or from a documented locality.

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

Likely formed during high-grade metamorphism or crystallization in a granitic pegmatite, with mica separating along cleavage planes. Such rocks commonly formed in Precambrian to Phanerozoic continental crust.

Uses & applications

Muscovite is used industrially in electrical insulation, fillers, paints, and cosmetics; attractive pieces are sold as mineral specimens. The small, fractured specimen has little construction value.

Geological facts

Mica’s perfect basal cleavage allows it to split into exceptionally thin elastic sheets. Its glitter comes from reflected light off numerous cleavage surfaces.

Field identification & locations

Look for flexible, peelable sheets, a pearly sheen, and light-colored quartz or feldspar intergrowths; a glass scratch test can help distinguish harder quartz. Common localities include pegmatites and metamorphic belts worldwide, especially Brazil, India, Madagascar, and the United States.