mineral

Tumbled green-blue glassy mineral, possibly fluorite or aventurine

Uncertain from image; possible fluorite (CaF₂) or quartz aventurine (SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent, blue-green, vitreous luster, rounded/polished surface; fluorite has Mohs hardness 4 and cubic cleavage, while quartz has hardness 7 and no cleavage. The photograph is insufficient for reliable identification.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

If fluorite, it formed in hydrothermal veins; if aventurine, it is quartz containing green mica or fuchsite inclusions. Both commonly formed in veins and cavities over varied geological ages.

Uses & applications

Used as a lapidary or decorative stone; fluorite is also an industrial flux, while quartz is used in glass, abrasives, and electronics.

Geological facts

Color and shape alone cannot distinguish mineral from dyed glass or slag. A hardness, streak, and specific-gravity test would be needed.

Field identification & locations

Check for internal bubbles or perfectly uniform color, which suggest glass; scratch testing and cleavage are more diagnostic. Comparable material occurs in China, Mexico, South Africa, India, and Brazil.