metamorphic
Green Aventurine (Fuchsite-bearing Quartzite)
Silicon Dioxide (SiO2) with Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Green (pale to forest green); Luster: Vitreous to greasy with a distinctive shimmering effect known as aventurescence; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green (pale to forest green)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Green (pale to forest green); Luster: Vitreous to greasy with a distinctive shimmering effect known as aventurescence; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. During this high-pressure process, platy inclusions of Fuchsite (green mica) are trapped within the quartz matrix, providing the signature color and shimmer. Most deposits are Proterozoic in age.
Uses & applications
Predominantly used for ornamental purposes, including cabochons for jewelry, figurines, decorative carvings, and landscape stones. In metaphysical trades, it is highly sought as a 'stone of opportunity'.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century, which this natural stone resembles.
Field identification & locations
Identify in the field by its distinct 'glittery' appearance under sunlight and its ability to scratch glass. It is commonly found in India (the primary commercial source), Brazil, Russia, and Tanzania. Collectors should look for even color distribution and a strong schiller effect.
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