metamorphic

Unidentified gray-green rock, possibly serpentinite or altered basalt

Tentatively serpentinite (serpentine-group minerals), but identification is uncertain from the blurred image

AI-generated identification · may be incorrect

Dull to waxy luster; mottled gray-green and pale patches; likely fine-grained and massive, with no visible crystal faces or cleavage. If serpentinite, hardness is about 2.5–4 and specific gravity about 2.5–2.6.

Identified August 15, 2026More metamorphic →

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At a glance

Common name: Unidentified gray-green rock, possibly serpentinite or altered basalt
Scientific name: Tentatively serpentinite (serpentine-group minerals), but identification is uncertain from the blurred image
Category: metamorphic
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Approximately $2–$20 for a small common specimen; $20–$75 if attractively patterned, polished, or locality-labeled.

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 hydrate during low-temperature metamorphism, commonly along fault zones and ophiolites; age depends on locality. The specimen may alternatively be weathered basalt or another altered rock.

Uses & applications

Serpentinite is used as decorative stone, carvings, countertops, and a collector specimen; altered basalt is mainly used as aggregate or dimension stone.

Geological facts

The image is insufficient for a confident species-level identification; a fresh surface, hardness test, streak, and magnified texture would help distinguish serpentinite from basalt or chlorite-rich rock.

Field identification & locations

Commonly found in ophiolite belts and tectonic collision zones, including California, Italy, New Zealand, and the Alps. A waxy feel, green veins, and very low hardness favor serpentinite; acid reaction would suggest carbonate-bearing rock.