metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 Mohs; Color: Forest green to sea green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.7
- Hardness
- 6
- Color
- Forest green to sea green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Forest green to sea green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.7
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where small mica flakes (usually Fuchsite) become embedded in the quartz matrix, creating a characteristic aventurescence.
Uses & applications
Used widely for ornamental carvings, polished cabochons, jewelry, and as a popular stone for 'crystal healing' and decorative home goods.
Geological facts
The name 'Aventurine' comes from 'a ventura', meaning 'by chance', which originally referred to the accidental discovery of Italian aventurine glass (Goldstone) in the 18th century.
Field identification & locations
Identify by its green color and 'aventurescence' (a shimmering effect caused by light reflecting off mica flakes). Found commonly in India, Brazil, and Russia. It can be distinguished from Jade by its grainy texture and lower density.
