metamorphic

Rounded gray-green stone, likely serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, opaque, waxy to dull luster, gray-green mottled color, and massive rather than visibly crystalline texture; the rounded shape appears tumbled or naturally water-worn.

Identified August 16, 2026More metamorphic →

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At a glance

Common name: Rounded gray-green stone, likely serpentinite
Scientific name: Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite
Category: metamorphic
Identified: August 16, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a small common tumbled specimen; $25–$100+ for attractive polished or locality-labeled 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

Typically Mohs 2.5–4, opaque, waxy to dull luster, gray-green mottled color, and massive rather than visibly crystalline texture; the rounded shape appears tumbled or naturally water-worn.

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo hydration and low-temperature metamorphism, commonly along oceanic crust and tectonic fault zones. Exact age cannot be determined from the photograph.

Uses & applications

Used as decorative and architectural stone, carvings, countertops, and collectible specimens; fibrous chrysotile-bearing material should not be cut or powdered because of asbestos hazards.

Geological facts

Serpentinite often contains magnetite and may be weakly magnetic. Its mottled, “scaly” appearance resembles snakeskin, inspiring the name.

Field identification & locations

Field clues include green-gray color, greasy or waxy feel, low hardness, and possible magnetism; it can be confused with green marble, soapstone, or altered basalt. Common in California, Italy, New Zealand, and ophiolite belts worldwide.