metamorphic

Rounded green-gray pebble, possibly serpentinite

Undetermined; appearance is consistent with serpentine-rich rock, but a photograph cannot confirm the mineral identification

AI-generated identification · may be incorrect

Fine-grained, smooth and water-worn, with mottled dark and pale green-gray patches. Serpentinite commonly has Mohs hardness of about 2.5–5 and a waxy to dull luster; crystal structure and cleavage are not discernible here.

Identified October 4, 2026More metamorphic →

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At a glance

Common name: Rounded green-gray pebble, possibly serpentinite
Scientific name: Undetermined; appearance is consistent with serpentine-rich rock, but a photograph cannot confirm the mineral identification
Category: metamorphic
Identified: October 4, 2026
Method: Standard

AI Estimated Value

About $0–$5 for an ordinary pebble; higher value would require confirmed identity or notable quality.

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

If serpentinite, it formed through hydration and metamorphic alteration of ultramafic rock, commonly in ancient oceanic crust or mountain belts. The pebble’s age and source cannot be determined from the image.

Uses & applications

A small pebble is mainly suitable for collecting or decoration; serpentinite may also be used as ornamental stone and, historically, as a source of decorative material.

Geological facts

Its rounded shape indicates abrasion during transport by water or other sediment-moving processes.

Field identification & locations

Green mottling supports a possible serpentinite identification, but many rocks look similar; hardness, streak, and close examination would help distinguish it. Pebbles occur in river and beach gravels worldwide.