metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69; Features a characteristic shimmering effect called aventurescence.
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69; Features a characteristic shimmering effect called aventurescence.
Formation & geological history
Formed in metamorphic rocks as quartz undergoes recrystallization while containing platy mineral inclusions like chromium-rich fuchsite mica. This can occur in regional metamorphic environments over millions of years.
Uses & applications
Predominantly used for ornamental purposes, carvings, jewelry (cabochons and beads), and as a popular specimen for crystal healing and mineral collecting.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass. The 'sparkle' in green aventurine is specifically caused by chromium-rich mica known as fuchsite.
Field identification & locations
Identify in the field by its sugary/granular texture and the 'aventurescence' (internal glitter). Unlike jade, it is harder and more translucent with more obvious crystalline grains. Found commonly in India, Brazil, and Russia.
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