mineral

Tumbled green stone, likely serpentine or green aventurine

Uncertain; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or quartz-rich aventurine

AI-generated identification · may be incorrect

Small polished/tumbled, olive-green, translucent-to-opaque stone with a waxy to subvitreous luster and no visible crystal faces. Likely hardness is about 2.5–4 for serpentine or 6.5–7 for aventurine; cleavage is absent or poorly developed.

Identified September 22, 2026More mineral →

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At a glance

Common name: Tumbled green stone, likely serpentine or green aventurine
Scientific name: Uncertain; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or quartz-rich aventurine
Category: mineral
Identified: September 22, 2026
Method: Standard

AI Estimated Value

$2–$15 for a common tumbled stone; $20–$100+ if confirmed as high-quality jade or an attractive collectible mineral.

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 rocks undergo hydrothermal alteration, commonly during Paleozoic–Mesozoic tectonic activity; aventurine forms in quartz veins and metamorphic environments. Exact identification requires testing.

Uses & applications

Used as a decorative tumbled stone, cabochon, carving material, and collectible; serpentine is also used for ornamental stone, while aventurine is used in jewelry.

Geological facts

The smooth shape indicates human tumbling and polishing. Color alone cannot distinguish serpentine, aventurine, jade, prehnite, or other green minerals.

Field identification & locations

Check hardness with a steel nail or glass, inspect for quartz sparkle, and use a specific-gravity or refractive-index test; avoid calling it jade without laboratory confirmation. Green serpentine is common in California, Italy, New Zealand, and ultramafic belts worldwide.