metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. High aventurescence (shimmering effect).
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. High aventurescence (shimmering effect).
Formation & geological history
Formed through the regional metamorphism of sandstone or other silica-rich rocks, where the presence of mica minerals like fuchsite creates the characteristic green color and shimmering effect during recrystallization.
Uses & applications
Used primarily in ornamental carvings, jewelry (beads, cabochons), landscape architecture, and widely collected as a metaphysical or healing stone.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the 18th-century accidental discovery of goldstone glass which looks similar. It is often misidentified as jade due to its green color.
Field identification & locations
Identify by its platy mineral inclusions that create a glittery effect (aventurescence). Found commonly in India, Brazil, and Russia. Unlike emerald, it is quite hard and lacks distinct cleavage.
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