metamorphic

Likely mica-bearing metamorphic rock (possibly schist)

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite); identification is approximate from the image

AI-generated identification · may be incorrect

Dark, coarse, glittery specimen with reflective flakes and lighter mineral grains. Mica has Mohs hardness 2–3 and one perfect cleavage; quartz is hardness 7 with glassy luster. The rock’s exact properties cannot be determined from the photo.

Identified October 14, 2026More metamorphic →

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At a glance

Common name: Likely mica-bearing metamorphic rock (possibly schist)
Scientific name: Mica schist, composed mainly of quartz and mica (muscovite and/or biotite); identification is approximate from the image
Category: metamorphic
Identified: October 14, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a small, common hand specimen; higher values require distinctive quality or provenance.

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

Schist forms when clay-rich sedimentary or volcanic material is buried and metamorphosed under heat and pressure, aligning mica into a foliated texture. Its age depends on the locality and cannot be inferred visually.

Uses & applications

Commonly collected as a decorative specimen; some varieties are used as building stone or aggregate. Mica itself is used in electrical, industrial, and cosmetic products.

Geological facts

The sparkling flecks are likely mica reflecting light; schist typically shows platy minerals arranged in layers or a preferred direction.

Field identification & locations

Look for visible, platy mica flakes and a foliated or layered fabric; common in metamorphic mountain belts worldwide. The image alone does not confirm schist versus another mica-rich rock.