Rock Identifier
Green Aventurine (Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral
mineral

Green Aventurine

Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Hardness: 7 (Mohs list); Color: Light to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69

Hardness
7 (Mohs list)
Color
Light to dark green with a shimmering effect
Luster
Vitreous to waxy
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Physical properties

Hardness: 7 (Mohs list); Color: Light to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69

Formation & geological history

Formed in metamorphic rocks (phyllites and schists) through the recrystallization of quartz around mica minerals, primarily during orogenic (mountain-building) events.

Uses & applications

Primary use is in jewelry, carvings, and as decorative stones in aquariums or landscaping. It is highly popular in the metaphysical and gemstone collecting community.

Geological facts

The name comes from the Italian 'a ventura' meaning 'by chance,' originally referring to the discovery of aventurine glass in the 18th century. Green aventurine owes its color to tiny inclusions of chromium-rich fuchsite mica.

Field identification & locations

Identify by its 'aventurescence'—a glittering metallic effect caused by light reflecting off platy mineral inclusions. Commonly found in India (the largest producer), Brazil, and Russia.

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