metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock (quartzite) where quartz is recrystallized under heat and pressure. The green color and 'aventurescence' sparkle are caused by platy inclusions of green chromium-rich mica known as Fuchsite.
Uses & applications
Used widely in lapidary work for cabochons, beads, figurines, and tumbled stones. Also popular in ornamental carvings, architectural accents, and the metaphysical gemstone market.
Geological facts
The name comes from the Italian 'a ventura' (by chance), originally referring to accidental discovery of aventurine glass. Natural aventurine is often called the 'Stone of Opportunity' in folklore. Its distinct shimmer is an optical effect called aventurescence.
Field identification & locations
Identified by its grainy quartz texture combined with a shimmering green sheen. To distinguish from green jade, check for the granular/sugary texture of quartz. It is commonly found in India, Brazil, Russia, and Austria.
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