metamorphic

Likely serpentinite (rough green serpentinite rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, and chrysotile)

AI-generated identification · may be incorrect

The specimen appears massive, fractured, and pale green to gray, with a dull to slightly waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5; exact texture and composition cannot be confirmed from the image.

Identified September 24, 2026More metamorphic →

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At a glance

Common name: Likely serpentinite (rough green serpentinite rock)
Scientific name: Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, and chrysotile)
Category: metamorphic
Identified: September 24, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common rough hand specimen; larger or unusually attractive pieces may sell for more.

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 water alters ultramafic rocks such as peridotite, commonly in oceanic crust and subduction zones. This process has occurred throughout geological history; the specimen’s age cannot be determined visually.

Uses & applications

Serpentinite is used as decorative and carving stone and, historically, as a building material. It may also be collected as a geological specimen.

Geological facts

Serpentinization can release hydrogen and produce distinctive mesh-like textures, though none is clearly identifiable here.

Field identification & locations

The green-gray color and massive, fractured appearance are consistent with serpentinite, but visual identification is uncertain; a hardness test and mineral analysis would help confirm it. Serpentinite occurs in ultramafic belts worldwide, including California, Italy, and New Zealand.