metamorphic

Polished dark green stone pendant, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (microcrystalline tremolite–actinolite)

AI-generated identification · may be incorrect

Dark olive-green to black, waxy to subvitreous luster, opaque, and irregularly polished; serpentine has Mohs hardness 2.5–4, while nephrite is 6–6.5. No visible crystal cleavage or structure can be confirmed from the image.

Identified August 17, 2026More metamorphic →

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At a glance

Common name: Polished dark green stone pendant, likely serpentine or nephrite jade
Scientific name: Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (microcrystalline tremolite–actinolite)
Category: metamorphic
Identified: August 17, 2026
Method: Standard

AI Estimated Value

Approximately $10–$40 as a common polished serpentine pendant; $50–$300 or more if confirmed as high-quality nephrite.

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 hydrate during metamorphism, while nephrite forms through metamorphic alteration of magnesium-rich rocks. These materials range from Precambrian to recent geologic settings.

Uses & applications

Used for carved ornaments, cabochons, jewelry, and decorative objects; nephrite generally has greater durability and value than serpentine.

Geological facts

The specimen is human-polished and wire-wrapped. Its dark color and mottled green surface are consistent with serpentine, but visual identification alone cannot reliably distinguish it from nephrite or other green stones.

Field identification & locations

Common sources include California, Vermont, New Zealand, China, Canada, and Russia. A scratch test, specific-gravity measurement, magnification, and ideally Raman or X-ray analysis are needed for confirmation.