mineral

Tumbled green stone, possibly serpentine or nephrite jade

Tentative: serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or nephrite, a fibrous amphibole aggregate

AI-generated identification · may be incorrect

Small rounded green specimen with a dull to waxy luster and mottled pale coloration. Serpentine is Mohs 2.5–4; nephrite is tougher and harder, about 6–6.5; crystal structure is generally concealed by fine-grained aggregates.

Identified September 1, 2026More mineral →

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At a glance

Common name: Tumbled green stone, possibly serpentine or nephrite jade
Scientific name: Tentative: serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or nephrite, a fibrous amphibole aggregate
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unidentified tumbled stone; approximately $20–$200+ if verified as attractive nephrite jade, depending on color, translucency, and workmanship.

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 hydration and alteration; nephrite forms through metamorphism and metasomatism in serpentinite-related rocks. Both commonly formed in ancient ophiolites and metamorphic belts.

Uses & applications

Used as decorative tumbled stone, carvings, and occasionally jewelry; confirmed jade can be valuable, while serpentine is mainly ornamental.

Geological facts

Color alone cannot reliably distinguish jade from serpentine, chrysoprase, or other green stones. Nephrite commonly shows interlocking fibrous texture under magnification and resists scratching better than serpentine.

Field identification & locations

Common sources include China, New Zealand, Canada, Russia, and the western United States. Test cautiously: a steel point may scratch serpentine but usually not quality nephrite; laboratory density, refractive index, and microscopy are more reliable.