metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Pale to medium green, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Pale to medium green, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) align within the quartz structure. Most specimens are from the Proterozoic or Phanerozoic eras.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, landscaping stones, and as a popular specimen for crystal collectors.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental glass production that mimicked this stone's appearance known as aventurescence.
Field identification & locations
Identify by its distinctive shimmering effect (aventurescence) caused by green mica flakes. Commonly found in India, Brazil, and Russia. Used by collectors for its calming aesthetic.
