metamorphic

Tumbled green-yellow stone, likely serpentine or nephrite jade

Serpentine-group mineral aggregate, commonly lizardite/antigorite; possible nephrite (interlocking tremolite-actinolite)

AI-generated identification · may be incorrect

Opaque olive-green to yellow, fine-grained, waxy to greasy luster, rounded and polished; estimated Mohs hardness 3–6 depending on composition. No visible crystals or cleavage; apparent density is moderate to high.

Identified August 13, 2026More metamorphic →

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At a glance

Common name: Tumbled green-yellow stone, likely serpentine or nephrite jade
Scientific name: Serpentine-group mineral aggregate, commonly lizardite/antigorite; possible nephrite (interlocking tremolite-actinolite)
Category: metamorphic
Identified: August 13, 2026
Method: Standard

AI Estimated Value

About $2–$15 as a common tumbled serpentine pebble; roughly $20–$200+ if confirmed as quality nephrite jade, depending on color, translucency, size, 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 mantle rocks hydrate during metamorphism, commonly in oceanic crust and subduction zones; nephrite forms by metamorphic alteration of magnesium-rich rocks. Exact age and identity require testing.

Uses & applications

Used as a decorative carving stone, lapidary material, ornamental pebble, and occasionally jewelry; true nephrite has greater commercial value than common serpentine.

Geological facts

The image alone cannot reliably distinguish serpentine from jade, dyed stone, or another green rock. A refractive index, specific-gravity, hardness, and microscopic examination would improve identification.

Field identification & locations

Look for mottled green color, waxy polish, and absence of obvious grains; serpentine is typically softer and scratches with a steel blade, while nephrite resists scratching and feels notably tough. Common sources include California, New Zealand, Canada, Russia, China, and Central Asia.