mineral

Aventurine

Silicon Dioxide (SiO2) with inclusions

Hardness: 6.5-7 (Mohs scale); Color: Light to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.69

Hardness: 6
Color: Light to medium green
Luster: Vitreous to waxy

Identified February 7, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Light to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.69

Formation & geological history

Formed in magmatic and metamorphic environments where silica-rich fluids crystallize. The green color and sparkly effect (aventurescence) are caused by platy inclusions of green fuchsite mica.

Uses & applications

Commonly used for ornamental carvings, beads, cabochons for jewelry, and as a popular tumbled stone for collectors and metaphysical practices.

Geological facts

The name 'aventurine' comes from the Italian 'a ventura', meaning 'by chance', referring to the accidental discovery of aventurine glass in the 18th century. It is often called the 'Stone of Opportunity'.

Field identification & locations

Identify by its characteristic 'aventurescence'—a shimmering or glistening effect when rotated under light. Commonly found in India, Brazil, Russia, and Tanzania. Collectors should look for uniform color and strong shimmer.

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