metamorphic

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), with possible brucite, magnetite, and carbonate

AI-generated identification · may be incorrect

Typically olive-green to yellow-green, waxy or dull luster, fine-grained and massive; Mohs hardness about 2.5–4, with poor cleavage and variable density. The specimen appears weathered and may contain pale yellow serpentine or carbonate veins.

Identified September 7, 2026More metamorphic →

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At a glance

Common name: Serpentinized ultramafic rock (likely serpentinite)
Scientific name: Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), with possible brucite, magnetite, and carbonate
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small common specimen; $30–$150+ for polished, vividly patterned, or provenance-rich 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 mantle-derived peridotite is hydrated and metamorphosed by circulating water, commonly along oceanic crust and tectonic fault zones. Serpentinization ranges from ancient Precambrian occurrences to modern tectonic settings.

Uses & applications

Used as decorative facing stone, carvings, countertops, and a minor source of magnesium; attractive pieces are collected. Chrysotile-bearing material should not be cut, drilled, or powdered because of asbestos risk.

Geological facts

Serpentinite often has a slick, waxy feel and may show mesh-like veining, magnetism from magnetite, and a pale green streak. It is commonly associated with chromite and talc deposits.

Field identification & locations

Common in ophiolites and alpine metamorphic belts, including California, Italy, New Zealand, and the Himalaya; distinguish it from jade by its lower hardness and waxier texture. A confirmed identification requires hardness, streak, magnetism, and thin-section or chemical testing.