mineral

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Hardness: 6.5-7.0 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal system); Cleavage: None; Specific Gravity: 2.64-2.69; Distinctive Aventurescence effect.

Hardness: 6
Color: Green
Luster: Vitreous to waxy

Identified June 24, 2026More mineral →

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Physical properties

Hardness: 6.5-7.0 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal system); Cleavage: None; Specific Gravity: 2.64-2.69; Distinctive Aventurescence effect.

Formation & geological history

Forms in magmatic or hydrothermal environments where silica-rich fluids cool. The green color and shimmer are caused by chromium-rich mica (fuchsite) inclusions within the quartz matrix.

Uses & applications

Mainly used for decorative carvings, cabochons for jewelry, interior design accents, and by collectors for metaphysical purposes.

Geological facts

The name Aventurine comes from the Italian 'a ventura', meaning 'by chance', originally referring to the 18th-century discovery of aventurine glass. Naturally occurring aventurine is one of the most popular varieties of chalcedony.

Field identification & locations

Identify by its 'aventurescence' (metallic glitter or shimmer when moved under light). Commonly found in India, Brazil, and Russia. Used by collectors to identify mica-rich quartz deposits.

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