metamorphic

Dark green metamorphic stone, likely serpentinite

Serpentinite; primarily serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chlorite, or talc

AI-generated identification · may be incorrect

Fine- to medium-grained, massive, dark green to gray-green, with dull to waxy luster and no obvious crystals or cleavage; Mohs hardness typically 2.5–4, specific gravity about 2.5–2.6. The photograph is consistent with serpentinite, though a definitive identification requires testing.

Identified September 11, 2026More metamorphic →

Explore Dark green metamorphic stone, likely serpentinite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Dark green metamorphic stone, likely serpentinite
Scientific name: Serpentinite; primarily serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chlorite, or talc
Category: metamorphic
Identified: September 11, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; $30–$150 or more for attractive polished or patterned 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 metamorphism, commonly along faults and seafloor subduction zones; specimens may range from Precambrian to modern tectonic settings.

Uses & applications

Used as decorative facing stone, carvings, countertops, and occasionally jewelry; softer material is mainly valued for ornamental and lapidary work rather than structural construction.

Geological facts

Serpentinite commonly contains mesh-like serpentine textures and may weather to a smooth, dark-green surface. Some specimens contain asbestos-form serpentine minerals, so avoid cutting or generating dust unless composition is confirmed.

Field identification & locations

Field clues include green color, low hardness, waxy feel, and association with ophiolites or ultramafic rocks; a steel knife may scratch it, while dilute acid typically produces little reaction. Common localities include California, Italy, New Zealand, and Canada.