metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs scale); Color: Green with aventurescence (shimmer); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green with aventurescence (shimmer)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green with aventurescence (shimmer); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks (quartzite) through the recrystallization of quartz, where chromium-rich muscovite mica (fuchsite) provides the green color and signature shimmer.
Uses & applications
Used primarily for lapidary work, including figurines, beads, cabochons for jewelry, and as a popular pocket stone for collectors and metaphysical practitioners.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of goldstone glass in the 18th century which looks similar.
Field identification & locations
Identify by its characteristic 'aventurescence,' a metallic glitter caused by tiny inclusions of green mica. Commonly found in India, Brazil, and Russia. It is harder than glass and steel.
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