Rock Identifier
Green Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)) — Mineral (variety of Quartz)
Mineral (variety of Quartz)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)

Hardness: 7 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.69. It features a distinctive 'aventurescence' (shimmer) caused by mica flakes.

Hardness
7 on Mohs scale
Color
Translucent to opaque green
Luster
Vitreous to waxy
Identified More mineral (variety of quartz) →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.69. It features a distinctive 'aventurescence' (shimmer) caused by mica flakes.

Formation & geological history

Formed in metamorphic rocks (schists) or igneous environments where silica-rich fluids cool and crystallize, entrapping mineral inclusions like fuchsite over millions of years.

Uses & applications

Predominantly used for jewelry (cabochons, beads), decorative carvings, aquarium gravel, and within the gemstone collection and metaphysical communities as a 'stone of opportunity.'

Geological facts

The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of 'aventurine glass' in the 18th century, which the stone later came to resemble.

Field identification & locations

Identify by its green color, quartz-like hardness (won't be scratched by steel), and the internal metallic shimmer (aventurescence). Commonly found in India, Brazil, Russia, and Tanzania. Often mistaken for jade or emerald but lacks their specific gravity and refractive index.

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