metamorphic

Mica-rich schist, likely lepidolite or muscovite schist

Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite

AI-generated identification · may be incorrect

Pale gray to pink, highly reflective platy mica with pronounced schistosity and irregular quartz/feldspar-rich patches. Mica has Mohs hardness 2–3, perfect basal cleavage, pearly to vitreous luster; the rock’s bulk hardness is roughly 5–6, with variable specific gravity around 2.6–2.9.

Identified August 10, 2026More metamorphic →

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At a glance

Common name: Mica-rich schist, likely lepidolite or muscovite schist
Scientific name: Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite
Category: metamorphic
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$150+ if unusually colorful, crystal-rich, or confirmed as lepidolite.

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

Formed when clay-rich sedimentary or granitic material was subjected to regional metamorphism, aligning mica flakes under heat and pressure. The specimen’s exact geological age cannot be determined visually; mica schists occur in Precambrian through younger metamorphic belts.

Uses & applications

Used mainly as decorative stone, lapidary material, and mineral specimens; mica may have industrial uses as electrical insulation and filler, but strongly foliated pieces have limited construction value.

Geological facts

The glitter comes from light reflecting off thousands of mica cleavage surfaces, not metallic minerals. Pink coloration may indicate iron-bearing muscovite or lithium-rich lepidolite, but chemical testing is needed for confirmation.

Field identification & locations

Look for easily separating, glittery sheets and a layered/fissile texture; a glassy streak or acid reaction would suggest other minerals. Common in regional metamorphic terrains worldwide, including the Appalachians, Brazil, India, and Madagascar.