mineral

Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: Pale to dark green with a shimmering effect (aventurescence); Luster: Vitreous; Crystal Structure: Trigonal (hexagonal); Cleavage: None; Specific Gravity: 2.64-2.69.

Hardness: 7 Mohs
Color: Pale to dark green with a shimmering effect (aventurescence)
Luster: Vitreous

Identified June 27, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Pale to dark green with a shimmering effect (aventurescence); Luster: Vitreous; Crystal Structure: Trigonal (hexagonal); Cleavage: None; Specific Gravity: 2.64-2.69.

Formation & geological history

Aventurine is a form of quartzite, formed through the metamorphism of sandstone. Most green varieties get their color and shimmer from inclusions of chrome-rich Fuchsite mica. It is typically found in metamorphic rocks that have undergone high pressure and temperature.

Uses & applications

Used extensively in jewelry for beads, cabochons, and carvings. Also used as a decorative stone for figurines, bookends, and ornamental objects. In metaphysical circles, it is known as the 'Stone of Opportunity'.

Geological facts

The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance'. This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looks similar to the natural mineral.

Field identification & locations

Identify in the field by its distinct green color and the 'aventurescence' effect—a sparkling or shimmering caused by light reflecting off mica flakes within the stone. Found commonly in India, Brazil, Russia, and Tanzania.