metamorphic

Mica schist (likely biotite–muscovite schist)

Schist dominated by quartz, feldspar, and mica (biotite/muscovite); composition varies by locality

AI-generated identification · may be incorrect

Coarse, strongly foliated rock with glittering platy mica, gray-white quartz/feldspar, and darker biotite. Hardness is roughly 2–3 for mica surfaces and 6–7 for quartz; pearly to vitreous luster, with schistosity and mica cleavage.

Identified September 14, 2026More metamorphic →

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At a glance

Common name: Mica schist (likely biotite–muscovite schist)
Scientific name: Schist dominated by quartz, feldspar, and mica (biotite/muscovite); composition varies by locality
Category: metamorphic
Identified: September 14, 2026
Method: Standard

AI Estimated Value

About $5–$25 for an ordinary hand specimen; $25–$100+ for unusually colorful, large, or well-preserved display pieces.

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 shale or another clay-rich sediment was subjected to regional metamorphism, typically during mountain building; age depends on its source terrane and may range from Precambrian to much younger.

Uses & applications

Used locally as decorative stone, landscaping material, flagstone, and sometimes aggregate; attractive pieces may be collected, but it is generally unsuitable for high-strength construction because foliation promotes splitting.

Geological facts

The visible sparkle comes from aligned mica flakes, which record directed pressure during metamorphism. Alternating light and dark bands may indicate compositional layering or deformation.

Field identification & locations

Identify it by its thin, flaky foliation and abundant mica glitter; unlike granite, it splits readily along planar layers. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalaya.