mineral

Tumbled green stone, likely aventurine or serpentine

Likely quartz-bearing green aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing

AI-generated identification · may be incorrect

Opaque to translucent green, rounded and polished with a vitreous-to-waxy luster; likely hardness Mohs 2.5–7 depending on material, with no visible cleavage. The cloudy color and rounded form are consistent with a tumbled specimen, but lighting prevents confident identification.

Identified August 30, 2026More mineral →

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At a glance

Common name: Tumbled green stone, likely aventurine or serpentine
Scientific name: Likely quartz-bearing green aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled piece; roughly $20–$75 for unusually vivid, translucent, or well-finished material.

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

Green aventurine forms when chromium- or fuchsite-bearing quartz crystallizes in metamorphic or hydrothermal settings; serpentine forms by hydration of ultramafic rocks. Geological ages vary widely by locality.

Uses & applications

Used for inexpensive cabochons, beads, carvings, décor, and lapidary practice; quality depends on color, translucency, and lack of fractures.

Geological facts

Aventurine commonly shows sparkling mica inclusions, while serpentine is softer and typically has a waxier luster. A steel scratch test, streak, and refractive or density testing would help distinguish them.

Field identification & locations

Common sources include India, Brazil, Russia, China, and Zimbabwe. Check for mica sparkle, hardness, and specific gravity; the pictured piece appears commercially tumbled.