mineral

Polished green cabochon, likely aventurine or serpentine

Quartz aventurine (SiO₂) or serpentine-group mineral; visual identification is uncertain

AI-generated identification · may be incorrect

Opaque to translucent dark green, vitreous-to-waxy luster, smoothly polished cabochon with no visible crystal faces. Aventurine has Mohs hardness 6.5–7; serpentine is softer, about 2.5–5.5, and typically shows a waxier surface.

Identified September 9, 2026More mineral →

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At a glance

Common name: Polished green cabochon, likely aventurine or serpentine
Scientific name: Quartz aventurine (SiO₂) or serpentine-group mineral; visual identification is uncertain
Category: mineral
Identified: September 9, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a common polished cabochon; $20–$75 if it proves to be attractive natural aventurine or high-quality serpentine.

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 veins; serpentine forms by hydration of ultramafic rocks. Both are generally Precambrian to younger, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry; serpentine is also used decoratively as a soapstone-like material.

Geological facts

The even dark-green color and lack of obvious glitter make serpentine or dyed chalcedony possible; a scratch, specific-gravity, or refractive-index test is needed for confident identification.

Field identification & locations

Common sources include India, Brazil, Russia, China, and the United States. Check for tiny mica sparkles, hardness, and translucency; glassy conchoidal fracture favors chalcedony, while waxy softness favors serpentine.