mineral
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite)
Hardness: 7 (Mohs scale), Color: Translucent to opaque green, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 (Mohs scale), Color: Translucent to opaque green, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks (phyllites or schists) where quartz crystallization occurs alongside chrome-rich micas like fuchsite. This process typically happens over millions of years during regional metamorphism.
Uses & applications
Commonly used for lapidary work including beads, cabochons, carvings, and tumbled stones. Often used in jewelry and for ornamental display.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', which originally referred to a type of Italian glass (Goldstone) discovered accidentally that looked like this natural stone.
Field identification & locations
Check for 'aventurescence,' a shimmering effect caused by plate-like inclusions. Found frequently in India, Brazil, and Russia. Collectors look for uniform color and strong glitter.
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