metamorphic
Aventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Green with shimmering spots; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69.
- Hardness
- 6
- Color
- Green with shimmering spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Green with shimmering spots; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (usually fuchsite) align to create a shimmering effect known as aventurescence. Dates back to various geological eras depending on location.
Uses & applications
Extensively used in jewelry making (beads, cabochons), ornamental carvings, figurines, and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century. It is known as the 'Stone of Opportunity.'
Field identification & locations
Identify in the field by its distinct platter-like shimmering inclusions (aventurescence) and its toughness compared to glass. Found commonly in India, Brazil, Russia, and Tanzania. Collectors should look for even color distribution.
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