mineral

Aventurine (Green Quartz)

Quartz with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)

Hardness: 6.5-7 (Mohs), Color: Pale to medium green with speckles, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.64-2.69

Hardness: 6

Identified February 5, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Pale to medium green with speckles, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.64-2.69

Formation & geological history

Formed in metamorphic environments where silica-rich fluids crystallize around inclusions of chromium-rich mica (fuchsite). Most deposits are Proterozoic in age.

Uses & applications

Primarily used for jewelry cabochons, ornamental carvings, decorative stones, and as a popular gemstone for crystal collecting and metaphysical purposes.

Geological facts

The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to an 18th-century accidental discovery of goldstone glass that looks similar to this mineral.

Field identification & locations

Identified by its 'aventurescence' (a shimmering or glistening effect caused by platy mineral inclusions). Common locations include India, Brazil, and Russia. Collectors should look for the distinctive green mica flakes under magnification.

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