metamorphic
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs), Color: 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), Color: Green, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None, Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the metamorphic transformation of sandstone into quartzite, where high pressure and temperature cause mineral impurities like Fuchsite to distribute within the quartz structure.
Uses & applications
Used widely in lapidary work for cabochons, beads, ornamental carvings, and 'metaphysical' healing stones. Occasionally used in interior decor.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental-gold-flecked glass made in Venice in the 18th century.
Field identification & locations
Identify by its distinctive 'aventurescence' (a shimmering or glistening effect caused by platy mineral inclusions). Common locations include India, Brazil, and Russia.
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