metamorphic
Green Aventurine
Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69.
- Hardness
- 6
- Color
- Translucent to opaque green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone), where high pressure and temperature cause recrystallization. The green color is derived from inclusions of chromium-rich Fuchsite mica.
Uses & applications
Primarily used for ornamental carvings, jewelry (cabochons and beads), landscaping stones, and as a popular specimen for crystal collecting and lapidary work.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura,' meaning 'by chance.' This refers to the lucky discovery of aventurine glass (goldstone) in the 18th century, which looks similar to the natural mineral.
Field identification & locations
Identify in the field by its distinct 'aventurescence,' which is a metallic glitter or shimmer caused by light reflecting off platy mineral inclusions. It is most commonly found in India, Brazil, Russia, and Austria.
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