metamorphic

Tumbled green-gray stone, possibly serpentinite

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, waxy to greasy luster, green-gray to brown coloration, mottled appearance, and commonly massive rather than visibly crystalline; the specimen appears rounded and polished/tumbled.

Identified September 1, 2026More metamorphic →

Explore Tumbled green-gray stone, possibly serpentinite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled green-gray stone, possibly serpentinite
Scientific name: Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
Category: metamorphic
Identified: September 1, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common tumbled specimen; $30–$150+ for attractive large polished or patterned pieces.

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

Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, often along tectonic plate boundaries; formation ages vary widely by locality.

Uses & applications

Used as decorative or architectural stone, carvings, lapidary material, and occasionally jewelry; polished pieces are valued mainly for color and pattern.

Geological facts

Serpentinite is named for its resemblance to snakeskin and may contain magnetite, producing dark patches or weak magnetism. Some varieties can contain chrysotile asbestos, so avoid cutting or generating dust without proper testing and controls.

Field identification & locations

Common in ophiolite belts and subduction-related mountain regions, including California, Italy, New Zealand, and Canada. A waxy feel, low hardness, green mottling, and possible magnetism support identification; similar stones include jade and soapstone.