metamorphic

Serpentine (likely polished serpentine-rich rock)

Serpentinite; predominantly serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor chlorite/talc

AI-generated identification · may be incorrect

Typically green to yellow-green, mottled or veined, with waxy to greasy luster; Mohs hardness about 2.5–4, opaque, massive rather than visibly crystalline, and specific gravity roughly 2.5–2.7. The rounded, glossy surface appears polished or naturally water-worn.

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Serpentine (likely polished serpentine-rich rock)
Scientific name: Serpentinite; predominantly serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor chlorite/talc
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common polished pebble; $30–$150 for attractive carved or patterned specimens.

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 low-temperature metamorphism, commonly along oceanic crust and tectonic fault zones. Most examples are Paleozoic to younger, though the specimen’s age cannot be determined visually.

Uses & applications

Used as a decorative stone, carvings, cabochons, and occasionally architectural facing; historically used for ornamental objects. Chrysotile-rich varieties can contain asbestos and should not be cut or abraded without proper precautions.

Geological facts

The green color results from hydrated magnesium silicate minerals, often with iron-bearing veins or red-brown alteration zones. Serpentinite is California’s state rock.

Field identification & locations

Identify by its smooth waxy green appearance, dark veining, low hardness, and ability to scratch with a steel blade; acid generally causes no reaction. Common localities include California, Italy, New Zealand, Canada, and the Appalachian region.