metamorphic

Unidentified dark green rock, possibly serpentinite

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image

AI-generated identification · may be incorrect

Dark green, dull to waxy luster, fine-grained and massive; serpentine has Mohs hardness about 2.5–4 and typically no visible crystals. The specimen appears rounded and weathered, but color and texture are insufficient for confident identification.

Identified August 15, 2026More metamorphic →

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At a glance

Common name: Unidentified dark green rock, possibly serpentinite
Scientific name: Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image
Category: metamorphic
Identified: August 15, 2026
Method: Standard

AI Estimated Value

$1–$10 for a small common fragment; $20–$100+ for polished or attractive collector-quality 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

Serpentinite forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly in oceanic crust and subduction zones; ages vary widely from Precambrian to modern tectonic settings.

Uses & applications

Used as decorative and carving stone, aggregate, and historically as “green marble”; attractive pieces may be collected, though fibrous varieties can contain asbestos minerals.

Geological facts

Common look-alikes include greenstone, basalt, chlorite schist, and weathered copper-bearing rock. A sharp image, streak, hardness test, and specific-gravity or mineral analysis would be needed for confirmation.

Field identification & locations

Common in ophiolite belts and metamorphic terrains, including California, Italy, New Zealand, and Canada. Waxy texture, greasy feel, pale-green streak, and softness support serpentine identification; avoid sawing unknown fibrous material.