metamorphic

Serpentine-rich metamorphic rock

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

AI-generated identification · may be incorrect

Typically soft to moderately hard (Mohs 2.5–4), mottled olive-green, yellow-green, brown, and black; waxy to greasy luster, fine-grained massive texture, and no obvious cleavage. The specimen’s weathered rusty areas likely reflect iron oxidation.

Identified September 13, 2026More metamorphic →

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At a glance

Common name: Serpentine-rich metamorphic rock
Scientific name: Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, chrysotile) with possible magnetite, talc, and carbonate
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common rough specimen; $30–$150 for attractive polished or display-quality 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 hydrate during hydrothermal alteration, commonly along faults and tectonic plate boundaries. Most examples are Paleozoic to younger, depending on the tectonic belt.

Uses & applications

Used as decorative facing stone, carvings, and teaching specimens; historically used for ornamental objects. Chrysotile-bearing material may contain hazardous asbestos fibers and should not be cut or powdered.

Geological facts

Serpentinite commonly contains magnetite, making some pieces weakly magnetic; its green coloration results from serpentinization rather than abundant emerald or copper.

Field identification & locations

Identify by its greasy/waxy green appearance, low hardness, dense massive texture, and occasional magnetism; common in California, New Zealand, Italy, the Alps, and many ophiolite belts. A precise identification requires hardness, streak, magnetism, and thin-section or chemical testing.