mineral

Aventurine

Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69

Hardness: 6
Color: Green
Luster: Vitreous to waxy

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69

Formation & geological history

Forms in metamorphic rocks like phyllites or schists and in hydrothermal veins. The color comes from inclusions of green fuchsite mica within the quartz.

Uses & applications

Commonly used for tumbled stones, cabochons, carvings, ornamental jewelry, and decorative objects.

Geological facts

The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of goldstone glass that looks similar.

Field identification & locations

Identify by its 'aventurescence' (a shimmering effect caused by mica inclusions). Found frequently in India, Brazil, and Russia. Often mistaken for jade or emerald.