metamorphic
Green Aventurine
Quartzite (Silicon Dioxide, SiO2 + Fuchsite)
Hardness: 7 (Mohs scale); Color: Green (from Fuchsite inclusions); Luster: Vitreous to waxy; Texture: Granular with a characteristic shimmer called aventurescence. Non-cleavage, conchoidal fracture.
- Hardness
- 7 (Mohs scale)
- Color
- Green (from Fuchsite inclusions)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Green (from Fuchsite inclusions); Luster: Vitreous to waxy; Texture: Granular with a characteristic shimmer called aventurescence. Non-cleavage, conchoidal fracture.
Formation & geological history
Formed when quartz-rich sedimentary rocks (sandstone) undergo metamorphism. The distinct green color comes from chromium-rich mica (fuchsite) platey inclusions that become trapped within the quartz matrix during recrystallization.
Uses & applications
Widely used for ornamental carvings, beads, tumbled stones for the metaphysical market, and occasionally as a minor gemstone in jewelry. It is also used in decorative landscaping and aquarium decor.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance,' referencing the accidental discovery of aventurine glass (Goldstone) in the 18th century, which this natural stone resembles.
Field identification & locations
Identified by its characteristic green 'platy' shimmering effect when turned in the light. It is commonly found in India, Brazil, Russia, and Tanzania. Collectors look for uniform color and strong 'sparkle' (aventurescence).
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