metamorphic

Micaceous schist (likely quartz–mica schist)

Quartz–mica schist; chiefly quartz (SiO₂), muscovite/biotite micas, with possible feldspar and accessory iron oxides

AI-generated identification · may be incorrect

Gray to silvery, strongly foliated and sparkly, with platy mica grains and uneven fracture; mica hardness is ~2–3 Mohs, quartz ~7, with pearly to glassy luster. Exact identification is limited by the photograph.

Identified September 13, 2026More metamorphic →

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At a glance

Common name: Micaceous schist (likely quartz–mica schist)
Scientific name: Quartz–mica schist; chiefly quartz (SiO₂), muscovite/biotite micas, with possible feldspar and accessory iron oxides
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Typically $5–$25 for a hand specimen; larger, unusually attractive or locality-labeled pieces may sell for $30–$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

Formed when shale or another clay-rich sediment was subjected to elevated temperature and pressure during regional metamorphism, commonly during mountain building; age depends on locality and may range from Precambrian to younger Paleozoic rocks.

Uses & applications

Used locally as decorative stone, fill, landscaping material, and occasionally dimension stone; attractive micaceous pieces are collected but are generally not gem material.

Geological facts

The glitter comes from aligned mica flakes reflecting light. Its foliation records directed pressure and commonly causes the rock to split into thin, irregular slabs.

Field identification & locations

Look for visible aligned mica, a layered or flaky texture, and sparkly cleavage surfaces; a streak test is usually white to gray. Common in metamorphic belts worldwide, including the Appalachians, New England, Scotland, Scandinavia, and parts of India.