metamorphic

Polished serpentine-rich rock (probable serpentinite)

Serpentinite; primarily serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible calcite, magnetite, and altered host minerals

AI-generated identification · may be incorrect

Typically green to yellow-green, mottled, waxy to greasy luster, and opaque; Mohs hardness about 2.5–4, with poor cleavage and massive texture. The specimen appears polished or naturally smoothed, with pale mineral veins and weathered brown margins.

Identified August 16, 2026More metamorphic →

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At a glance

Common name: Polished serpentine-rich rock (probable serpentinite)
Scientific name: Serpentinite; primarily serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible calcite, magnetite, and altered host minerals
Category: metamorphic
Identified: August 16, 2026
Method: Standard

AI Estimated Value

About $10–$50 for a common hand specimen; $50–$200+ for attractive, well-polished, locality-documented 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 hydrothermal metamorphism and hydration, commonly along faults and tectonic plate boundaries. Serpentinization ranges from ancient Precambrian terrains to active modern oceanic settings.

Uses & applications

Used as an ornamental and carving stone, countertop or tile material, and lapidary rough; softer pieces are mainly collected rather than used for jewelry.

Geological facts

Serpentinite can contain magnetite and may be weakly magnetic. Some varieties are associated with chrysotile asbestos, so avoid cutting, drilling, or generating dust unless its composition is confirmed and proper precautions are used.

Field identification & locations

Identify by its mottled green color, waxy feel, low hardness, veining, and inability to scratch glass; a steel knife may scratch it. Common localities include California, Italy, New Zealand, Canada, and Oman.