metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Green with aventurescence (shimmering effect); Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green with aventurescence (shimmering effect)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Green with aventurescence (shimmering effect); Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sediment containing quartz and chromium-rich micas (fuchsite). The shimmering effect is caused by platy inclusions of mica within the quartz matrix.
Uses & applications
Used primarily for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for crystal collecting.
Geological facts
Commonly known as the 'Stone of Opportunity.' The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass in the 18th century which looks very similar.
Field identification & locations
Identify by its distinctive shimmering metallic glints (aventurescence) and grainy, crystalline texture. Found commonly in Brazil, India, Russia, and Tanzania.
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