metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 Mohs; Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal (massive); Cleavage: None; Specific gravity: 2.64-2.69. It features aventurescence (a shimmering effect).
- Hardness
- 7 Mohs
- Color
- Pale to dark green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal (massive); Cleavage: None; Specific gravity: 2.64-2.69. It features aventurescence (a shimmering effect).
Formation & geological history
Formed through regional metamorphism where quartz-rich sediments are subjected to heat and pressure. The green color comes from inclusions of chromium-rich fuchsite mica. Commonly formed in ancient metamorphic terrains.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons, beads), decorative carvings, and as a popular stone for gemstone collecting and metaphysical practices.
Geological facts
Aventurine is often called the 'Stone of Opportunity.' Its name is derived from the Italian 'a ventura,' meaning 'by chance,' originally referring to a type of glass discovered accidentally in the 18th century that looked similar.
Field identification & locations
Identify by its characteristic green color and shimmering 'spangles' (aventurescence) beneath the surface. It is commonly found in India, Brazil, Russia, and Tanzania. Look for a glassy surface that resists scratching by a steel knife.
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