metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7.0 (Mohs); Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (internal shimmering effect).
- Hardness
- 6
- Color
- Translucent to opaque green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Translucent to opaque green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (internal shimmering effect).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks or during hydrothermal processes where silica-rich fluids cool. The green color is derived from inclusions of chromium-rich chrome-mica (fuchsite).
Uses & applications
Commonly used for tumbled stones, decorative ornaments, jewelry (cabochons and beads), and as a popular 'healing' crystal in metaphysical practices.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' which originally referred to the 18th-century discovery of Goldstone glass that resembles this natural mineral.
Field identification & locations
Identify in the field by its green color paired with a characteristic 'spangled' shimmering effect caused by microscopic mica flakes. It is commonly found in India, Brazil, Russia, and Tanzania.
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