metamorphic

Tumbled dark-green stone, likely nephrite jade

Nephrite jade, a compact tremolite–actinolite amphibole aggregate (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); identification from the photo is uncertain

AI-generated identification · may be incorrect

Opaque to slightly translucent, dark green with a polished, waxy-to-greasy luster; nephrite has interlocking fibrous crystals and Mohs hardness 6–6.5. The rounded shape and surface shine indicate tumbling or polishing.

Identified September 29, 2026More metamorphic →

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At a glance

Common name: Tumbled dark-green stone, likely nephrite jade
Scientific name: Nephrite jade, a compact tremolite–actinolite amphibole aggregate (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); identification from the photo is uncertain
Category: metamorphic
Identified: September 29, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a small common tumbled stone; verified high-quality jade can be substantially more valuable.

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 when magnesium-rich rocks are altered by metamorphic fluids, commonly along tectonic boundaries; deposits range from ancient to geologically recent. A single photo cannot establish this specimen’s exact composition or age.

Uses & applications

Used for carvings, beads, cabochons, and ornamental objects; nephrite is also valued for its toughness.

Geological facts

Nephrite is exceptionally tough because its fine, interlocking amphibole fibers resist breaking; dark-green serpentine or other stones can look similar.

Field identification & locations

A gemological test is needed to distinguish jade from lookalikes; notable sources include China, British Columbia, New Zealand, and Siberia. The visible polish and dark color alone do not confirm jade.