metamorphic

Likely greenstone (serpentine or altered jade-like rock)

Serpentinite, chiefly serpentine-group minerals; exact identification requires testing

AI-generated identification · may be incorrect

Pale gray-green, opaque, dull to slightly waxy luster, fine-grained and rounded/tumbled. Serpentine has Mohs hardness about 2.5–4; jadeite or nephrite would be considerably tougher and harder (about 6–7).

Identified September 7, 2026More metamorphic →

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At a glance

Common name: Likely greenstone (serpentine or altered jade-like rock)
Scientific name: Serpentinite, chiefly serpentine-group minerals; exact identification requires testing
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common unidentified specimen; potentially $20–$100+ if verified as quality jade or an attractive collectible stone.

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

Typically forms when ultramafic mantle rocks are hydrated during metamorphism, often in ophiolite belts; formation ages vary widely from Precambrian to Recent tectonic settings.

Uses & applications

Used as carving stone, ornamental material, aggregate, and occasionally jewelry. This small unpolished piece has modest commercial value.

Geological facts

The appearance is insufficient to distinguish serpentine from nephrite, jadeite, chlorite-rich schist, or other green altered rocks. A hardness test, streak, specific gravity, and microscope examination are recommended.

Field identification & locations

Commonly found in tectonic mountain belts and near faults or ophiolites. Serpentine is usually softer and may scratch with a steel knife; jade is notably tough and resists chipping. Avoid acid or destructive testing without permission.