metamorphic

Rounded metamorphic pebble, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification requires testing

AI-generated identification · may be incorrect

Light gray, fine- to medium-grained, with dark mica-rich streaks and possible foliation; vitreous quartz and dull feldspar are likely. Approximate hardness 6–7 Mohs, nonmetallic luster, weak cleavage/foliation, and moderate density around 2.6–2.8 g/cm³.

Identified September 2, 2026More metamorphic →

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At a glance

Common name: Rounded metamorphic pebble, likely gneiss or mica schist
Scientific name: Quartz–feldspar–mica metamorphic rock; exact identification requires testing
Category: metamorphic
Identified: September 2, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as a common collected pebble; potentially $10–$30 if unusually attractive, locality-labeled, or polished.

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 preexisting rock underwent substantial heat and pressure, producing mineral alignment and banding; likely Precambrian to Paleozoic in age, then rounded by stream or glacial transport.

Uses & applications

Commonly used as decorative landscaping stone, aggregate, and occasionally as a polished ornamental material; this small pebble has minimal commercial value.

Geological facts

The dark streaks may be biotite or amphibole, while the pale matrix is probably quartz and feldspar. Surface weathering and abrasion obscure the original foliation.

Field identification & locations

Look for alternating light and dark mineral bands, visible mica flakes, and a scratch resistance near quartz; a streak, hardness, and acid test would refine identification. Such rocks are widespread in ancient continental shields, mountain belts, and glacial deposits.