mineral

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or chrysotile; approximate composition Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Dark green, opaque, and waxy to dull with a smooth tumbled surface; Mohs hardness about 2.5–4, generally massive rather than visibly crystalline, with no obvious cleavage. The photograph is insufficient for definitive identification; nephrite jade, aventurine, or dyed stone are alternatives.

Identified August 23, 2026More mineral →

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At a glance

Common name: Tumbled green stone, likely serpentine
Scientific name: Serpentine-group minerals, commonly antigorite or chrysotile; approximate composition Mg₃Si₂O₅(OH)₄
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Typically $1–$15 for a small tumbled piece; attractive carvings or confirmed jade-quality material may sell for $20–$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

Formation & geological history

Serpentine forms when ultramafic rocks undergo hydrothermal alteration and hydration, commonly in ancient and modern plate-boundary settings. Individual specimens may range from Precambrian to much younger, depending on locality.

Uses & applications

Used as decorative stone, carvings, beads, and ornamental objects; some varieties are sold as “new jade.” Industrial serpentine has limited applications, while asbestos-bearing varieties require safety precautions.

Geological facts

Serpentine is a mineral group, not one single mineral, and its green color comes mainly from iron and crystal defects. Avoid cutting or abrading unknown material because some serpentine contains fibrous chrysotile asbestos.

Field identification & locations

Common in California, New Zealand, Italy, Canada, and tectonic belts worldwide; identify by green waxy appearance, low hardness, and unusually low density. A hardness test, streak, specific gravity, and laboratory analysis would distinguish it from jade.