metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 Mohs; Color: Pale to dark green with aventurescence; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal); Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to dark green with aventurescence
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Pale to dark green with aventurescence; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal); Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a quartzite through the regional metamorphism of sandstone, where chromium-rich Fuchsite mica inclusions impart the green color and signature shimmer.
Uses & applications
Used widely for ornamental carvings, statues, cabochons for jewelry, tumbled stones for collectors, and as a decorative stone in landscaping and flooring.
Geological facts
Known as the 'Stone of Opportunity', its name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass. The shimmer effect is specifically called aventurescence.
Field identification & locations
Identify by its grainy, sugary quartzite texture and the metallic green glints visible under direct light. Commonly found in India, Brazil, and Russia. Beginners should look for the characteristic mica inclusions that distinguish it from green glass or jade.
