mineral

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

AI-generated identification · may be incorrect

Translucent dark green, rounded/tumbled, with vitreous luster and uneven internal cloudy bands. Apparent hardness is roughly 4–7 Mohs depending on identity; crystal structure and cleavage cannot be determined from the photo.

Identified September 14, 2026More mineral →

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At a glance

Common name: Tumbled green glassy mineral, possibly aventurine or fluorite
Scientific name: Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled piece; $20–$75 if confirmed as attractive natural aventurine, fluorite, or another 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

If aventurine, it formed in silica-rich veins with fuchsite or other inclusions; if fluorite, it crystallized in hydrothermal veins. Green minerals and quartz varieties are plausible around the Andes near Santiago, Chile, but the image alone is insufficient for a firm identification.

Uses & applications

Used mainly as a decorative or lapidary stone; attractive pieces may be made into cabochons, carvings, or jewelry. Common tumbled specimens generally have modest value.

Geological facts

The smooth shape indicates human tumbling or natural abrasion, not a diagnostic crystal form. The specimen could also be green chalcedony or prehnite; color alone is unreliable.

Field identification & locations

Check hardness with a steel blade and glass: fluorite scratches glass poorly, while quartz scratches glass readily. A streak, specific gravity, UV response, and magnification would help; avoid assuming it is jade without testing.