metamorphic

Polished green stone, likely nephrite jade

Nephrite, an interlocking tremolite–actinolite amphibole aggregate (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

AI-generated identification · may be incorrect

Opaque, mottled dark-to-medium green with a polished, waxy-to-greasy luster; nephrite has Mohs hardness about 6–6.5 and tough, fibrous texture. The image alone cannot confirm jade or distinguish it from similar green stones such as serpentine.

Identified September 28, 2026More metamorphic →

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At a glance

Common name: Polished green stone, likely nephrite jade
Scientific name: Nephrite, an interlocking tremolite–actinolite amphibole aggregate (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
Category: metamorphic
Identified: September 28, 2026
Method: Standard

AI Estimated Value

About $10–$100 for a small polished cabochon of uncertain identity; confirmed quality and provenance can raise value substantially.

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 metamorphic alteration, commonly in contact or subduction-related settings; deposits range from ancient to geologically young. The pictured piece has been shaped and polished.

Uses & applications

Used for carvings, beads, ornaments, and jewelry; high-quality material is valued for its toughness and color.

Geological facts

Nephrite and jadeite are the two distinct minerals traditionally called jade; nephrite is notably resistant to breaking because of its interlocking fibers.

Field identification & locations

Check for a dense feel, waxy luster, and fibrous structure; definitive identification may require gemological testing. Nephrite occurs in places including British Columbia, New Zealand, Siberia, and China.