metamorphic

Green tumbled stone, possibly serpentine

Likely serpentine-group rock, chiefly serpentine minerals (approx. Mg₃Si₂O₅(OH)₄); identification is uncertain from the photograph.

AI-generated identification · may be incorrect

Small, rounded, translucent-to-opaque pale olive-green pebble with a waxy or dull luster and mottled appearance. Serpentine has Mohs hardness about 2.5–5 and a monoclinic crystal structure; hardness and cleavage cannot be determined from the image.

Identified September 30, 2026More metamorphic →

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At a glance

Common name: Green tumbled stone, possibly serpentine
Scientific name: Likely serpentine-group rock, chiefly serpentine minerals (approx. Mg₃Si₂O₅(OH)₄); identification is uncertain from the photograph.
Category: metamorphic
Identified: September 30, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common tumbled pebble; more only if testing confirms a desirable material such as jade.

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

Serpentine forms when magnesium-rich ultramafic rocks are altered by water, commonly during metamorphism; such rocks range widely in age and occur in mountain belts and oceanic crust.

Uses & applications

Serpentine is used as ornamental stone, carvings, and some jewelry; softer pieces are mainly decorative or collectible.

Geological facts

Green color alone is not diagnostic: jade, quartz, glass, and other stones can look similar. A reliable identification may require hardness, specific-gravity, or laboratory testing.

Field identification & locations

The smooth, rounded shape suggests tumbling or water wear. Serpentine is common in ultramafic-rock belts worldwide; avoid scratch or chemical tests on a potentially valuable piece.