mineral

Tumbled green-blue stone, likely serpentine or aventurine

Serpentine-group minerals, chiefly antigorite/lizardite; possible quartz-rich green aventurine

AI-generated identification · may be incorrect

Typically Mohs 2.5–4 (serpentine) or about 7 (aventurine quartz); translucent to opaque green-blue, waxy to glassy luster, massive rather than visibly crystalline, with no prominent cleavage. The rounded, polished form and mottled color obscure diagnostic features, so identification is provisional.

Identified September 12, 2026More mineral →

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At a glance

Common name: Tumbled green-blue stone, likely serpentine or aventurine
Scientific name: Serpentine-group minerals, chiefly antigorite/lizardite; possible quartz-rich green aventurine
Category: mineral
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a common tumbled stone; $20–$100+ if laboratory-confirmed as high-quality jade or an unusually fine lapidary specimen.

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 hydrothermal or tectonic alteration, commonly in ophiolite belts; geological ages vary widely. Green aventurine forms from quartz veins containing fuchsite or other green inclusions.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and tumbling; serpentine is also used decoratively and occasionally in construction. Common tumbled pieces have modest value.

Geological facts

The blue-green color may result from serpentine minerals, chlorite, or other inclusions; color alone cannot distinguish it from jade, aventurine, chrysoprase, or dyed stone.

Field identification & locations

Common sources include California, Vermont, Italy, New Zealand, Russia, and Afghanistan for serpentine, while aventurine is notably found in India and Brazil. A steel scratch test, magnification, streak, and specific-gravity/refractive-index testing are needed for reliable identification; jade should not be confirmed from appearance alone.