mineral

Tumbled green stones, likely green aventurine or serpentine

Quartzite with fuchsite inclusions (green aventurine), or serpentine-group minerals; exact identification requires testing

AI-generated identification · may be incorrect

Opaque green-gray, rounded and polished, with waxy to subtly sparkling luster; likely Mohs 3–7 depending on composition, with no obvious cleavage and granular or fibrous texture

Identified August 23, 2026More mineral →

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At a glance

Common name: Tumbled green stones, likely green aventurine or serpentine
Scientific name: Quartzite with fuchsite inclusions (green aventurine), or serpentine-group minerals; exact identification requires testing
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

$2–$15 for this small mixed lot; attractive, well-identified individual pieces may sell for $1–$10 each

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

Opaque green-gray, rounded and polished, with waxy to subtly sparkling luster; likely Mohs 3–7 depending on composition, with no obvious cleavage and granular or fibrous texture

Formation & geological history

Green aventurine forms when quartz recrystallizes with mica inclusions, commonly during metamorphism; serpentine forms by hydrothermal alteration of ultramafic rocks. Specimens may be geologically ancient, but age depends on locality

Uses & applications

Used as inexpensive lapidary material, carvings, cabochons, tumbled stones, décor, and occasionally construction aggregate; typically modest collector value

Geological facts

Aventurine’s green color commonly comes from fuchsite mica, while serpentine’s color comes from iron and nickel-bearing minerals; a glassy sparkle favors aventurine

Field identification & locations

Common sources include India, Brazil, Russia, China, and the United States. Aventurine scratches glass weakly to readily (about Mohs 6–7); serpentine is much softer and may be scratched by a steel knife