mineral

Tumbled dark green stone, likely nephrite jade or green serpentine

Probably nephrite (interlocking tremolite–actinolite amphibole); alternatively massive serpentine (Mg₃Si₂O₅(OH)₄)

AI-generated identification · may be incorrect

Smooth, rounded, opaque dark green surface with waxy-to-vitreous luster; nephrite hardness 6–6.5 and specific gravity 2.9–3.1, while serpentine is softer at 2.5–4. It lacks visible crystals and has no obvious cleavage.

Identified August 21, 2026More mineral →

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At a glance

Common name: Tumbled dark green stone, likely nephrite jade or green serpentine
Scientific name: Probably nephrite (interlocking tremolite–actinolite amphibole); alternatively massive serpentine (Mg₃Si₂O₅(OH)₄)
Category: mineral
Identified: August 21, 2026
Method: Standard

AI Estimated Value

As an unverified tumbled stone, about $2–$20; confirmed attractive nephrite may range from $20 to several hundred dollars, with exceptional material worth much more.

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

Nephrite forms through metamorphism and metasomatic alteration of magnesium-rich rocks; serpentine forms by hydration of ultramafic mantle rocks. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used for carvings, beads, ornamental objects, and occasionally jewelry; serpentine is commonly sold as a jade look-alike. Value depends strongly on confirmed identity, color, translucency, and lack of fractures.

Geological facts

Nephrite is exceptionally tough because of its densely interwoven amphibole fibers. Dark green color may also occur in chlorite-rich rocks, basalt, or glass, so visual identification alone is unreliable.

Field identification & locations

Check for natural grain, translucency, hardness, and specific gravity; a gemological test or laboratory analysis is needed for confirmation. Common nephrite sources include British Columbia, Wyoming, New Zealand, China, and Siberia.