metamorphic

Tumbled yellow-green stone, likely serpentine or nephrite jade

Serpentine-group mineral, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate

AI-generated identification · may be incorrect

Hardness is typically 2.5–4 for serpentine and 6–6.5 for nephrite; olive-yellow to green, waxy to greasy luster, opaque, and fine-grained with no visible cleavage. The smoothly polished, rounded form is human-tumbled.

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Tumbled yellow-green stone, likely serpentine or nephrite jade
Scientific name: Serpentine-group mineral, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $2–$15 as a common tumbled serpentine; roughly $10–$75 if confirmed as attractive, 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 by hydration and metamorphism of ultramafic rocks, while nephrite forms through metamorphic alteration involving magnesium-rich rocks; ages vary widely by locality.

Uses & applications

Serpentine is used for carvings, ornamental stone, and decorative objects; nephrite is valued for jewelry and sculpture. This specimen’s modest size and uncertain identity limit commercial value.

Geological facts

Yellow-green color and waxy polish strongly suggest serpentine, though visual identification alone cannot distinguish it reliably from low-grade jade or other greenstone.

Field identification & locations

Common sources include California, New Zealand, China, Russia, Canada, and Afghanistan. Check hardness, translucency, heft, and streak; acid testing and laboratory analysis are more reliable than appearance.