metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions, SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 Mohs; Color: Forest green to sea green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69; Features 'aventurescence' (a shimmering effect caused by platy inclusions).
- Hardness
- 6
- Color
- Forest green to sea green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Forest green to sea green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69; Features 'aventurescence' (a shimmering effect caused by platy inclusions).
Formation & geological history
Formed in metamorphic rocks where quartz recrystallizes under heat and pressure alongside chromium-rich mica (fuchsite). Most deposits are estimated to be millions of years old, typically found in areas with historical tectonic activity.
Uses & applications
Used extensively in jewelry (beads, cabochons), ornamental carvings, tumbled stones for collecting, and as a decorative stone in landscaping or interior design.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental discovery of aventurine glass (goldstone) in the 18th century, which this natural stone resembles.
Field identification & locations
Identify by its shimmering metallic flakes (aventurescence) when rotated under light. Commonly found in India, Brazil, and Russia. Collectors value consistent deep green color and high translucency.
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