mineral
Green Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 on Mohs scale; Color: Green to grey-green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.64-2.69
- Hardness
- 7 on Mohs scale
- Color
- Green to grey-green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Green to grey-green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific gravity: 2.64-2.69
Formation & geological history
Formed in magmatic and hydrothermal environments, as well as metamorphic rocks like phyllites and schists. The green color is caused by chrome-bearing mica called fuchsite.
Uses & applications
Used extensively in jewelry for beads, cabochons, and carvings, as well as an ornamental stone in landscaping and aquariums.
Geological facts
Aventurine is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions. It is often mistaken for jade but is much harder.
Field identification & locations
Identified by its sandy/sparkly appearance (aventurescence) and conchoidal fracture. Commonly found in India, Brazil, and Russia. Collectors look for a deep green color and high translucency.
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