metamorphic

Polished greenstone (likely serpentine or altered basalt)

Serpentinite, mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

AI-generated identification · may be incorrect

Dark green to gray-green, matte to waxy luster, fine-grained and rounded with pinkish veins or patches. Mohs hardness about 2.5–5.5; cleavage generally absent, density commonly 2.5–2.7 g/cm³.

Identified September 13, 2026More metamorphic →

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At a glance

Common name: Polished greenstone (likely serpentine or altered basalt)
Scientific name: Serpentinite, mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Approximately $5–$40 as a common polished specimen; exceptional carving-grade material may sell for $50–$200.

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

Dark green to gray-green, matte to waxy luster, fine-grained and rounded with pinkish veins or patches. Mohs hardness about 2.5–5.5; cleavage generally absent, density commonly 2.5–2.7 g/cm³.

Formation & geological history

Likely formed by hydrothermal alteration of magnesium-rich ultramafic rock, commonly during ancient oceanic or tectonic processes; geological age cannot be determined from the image.

Uses & applications

Used as ornamental stone, carvings, cabochons, and occasionally architectural facing; attractive green varieties are collected but usually modestly priced.

Geological facts

Serpentinite can resemble jade, but it is generally softer and less dense. Pink veins may consist of carbonate minerals or iron-rich alteration products.

Field identification & locations

Look for a greasy or waxy surface, green coloration, low hardness, and pale or pink veining; a steel nail may scratch many specimens. Common in ophiolite belts and metamorphic terrains worldwide.