metamorphic

Serpentinite

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, chrysotile; approximately Mg₃Si₂O₅(OH)₄)

AI-generated identification · may be incorrect

Typically dark green to mottled green-black, with waxy to subtly greasy luster and a fine, often fibrous or veined texture; Mohs hardness is about 2.5–4, with no consistent cleavage. The specimen appears massive and unpolished, with pale serpentine or carbonate veining.

Identified September 12, 2026More metamorphic →

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At a glance

Common name: Serpentinite
Scientific name: Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, chrysotile; approximately Mg₃Si₂O₅(OH)₄)
Category: metamorphic
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common rough hand specimen; $30–$150 or more for unusually patterned, polished, or collectible material.

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, commonly along oceanic crust, subduction zones, and major faults. Its formation age varies widely with the host tectonic terrane.

Uses & applications

Used as decorative stone, carvings, countertops, and historically as a source rock for asbestos-bearing material; attractive pieces may be sold as lapidary rough or polished stone.

Geological facts

Serpentinite commonly contains magnetite and may be weakly magnetic. Chrysotile-bearing varieties can release hazardous fibers when cut or abraded, so avoid dust and do not test by grinding.

Field identification & locations

Identify it by its green color, waxy surface, soft hardness, irregular mesh-like texture, and pale veins; common worldwide in ophiolites and metamorphic belts, including California, Italy, New Zealand, and Canada.