metamorphic

Polished greenstone (probable nephrite jade)

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

AI-generated identification · may be incorrect

Hardness about 6–6.5 Mohs; opaque olive-green to brown, waxy to greasy luster, very tough and typically noncrystalline to the naked eye. The rounded, polished form obscures cleavage; density is commonly 2.9–3.1.

Identified September 17, 2026More metamorphic →

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At a glance

Common name: Polished greenstone (probable nephrite jade)
Scientific name: Nephrite jade; interlocking tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
Category: metamorphic
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Approximately $10–$75 for a small common polished piece; $100–$1,000+ if verified, finely worked, high-quality, or culturally documented.

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

Forms when magnesium-rich rocks undergo metamorphism, commonly in serpentinite-associated zones; deposits range from Paleozoic to younger tectonic settings. This appears human-shaped and polished, possibly a tool or ornamental piece.

Uses & applications

Used for carvings, beads, jewelry, tools, and cultural objects; quality depends on color, translucency, texture, size, and provenance.

Geological facts

Nephrite is renowned for exceptional toughness due to its felted amphibole fibers. Similar-looking jadeite is a different mineral and is generally harder and more valuable.

Field identification & locations

Field clues include unusually high toughness, waxy polish, fibrous texture, and resistance to scratching by a steel knife; definitive identification requires density, microscopy, or Raman/X-ray testing. Common sources include New Zealand, British Columbia, Siberia, Wyoming, and China.