metamorphic

Likely muscovite-bearing mica schist

Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz; exact identification is uncertain from the image alone.

AI-generated identification · may be incorrect

Pale silvery-gray with a pearly sheen and flaky, foliated texture. Muscovite has Mohs hardness 2–2.5 and perfect basal cleavage; quartz is harder (7).

Identified October 17, 2026More metamorphic →

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At a glance

Common name: Likely muscovite-bearing mica schist
Scientific name: Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz; exact identification is uncertain from the image alone.
Category: metamorphic
Identified: October 17, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small, common hand specimen; more if unusually attractive 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

Pale silvery-gray with a pearly sheen and flaky, foliated texture. Muscovite has Mohs hardness 2–2.5 and perfect basal cleavage; quartz is harder (7).

Formation & geological history

Forms when clay-rich sedimentary rocks undergo regional metamorphism, aligning mica flakes into layers. Its age cannot be determined from appearance; schists occur in many ancient mountain belts.

Uses & applications

Mica is used in electrical and heat-resistant products; schist is mainly a decorative or landscaping stone, and attractive specimens are collected.

Geological facts

The reflective plates are consistent with mica, which splits into extremely thin, flexible sheets.

Field identification & locations

Look for platy flakes that glint and separate along foliation; a scratch or cleavage test can help distinguish mica-rich schist from other silvery rocks. Mica schists occur worldwide in metamorphic terrains.