metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 6.5-7 on Mohs scale; Color: Dull to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. Exhibits 'aventurescence' (glistening effect).
- Hardness
- 6
- Color
- Dull to medium green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dull to medium green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. Exhibits 'aventurescence' (glistening effect).
Formation & geological history
Formed in metamorphic rocks where quartz is subjected to high pressure and heat, allowing for the inclusion of Fuchsite (chromium-rich mica) platey crystals which provide the green color.
Uses & applications
Widely used for cabochons, beads, ornamental carvings, figurines, and as a popular pocket stone in the crystal healing and collecting community.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental 18th-century Italian glass production that mimicked this natural stone's glitter.
Field identification & locations
Identify by its characteristic green color and the presence of tiny, platey shimmering inclusions. Common locations include India, Brazil, Russia, and Tanzania.
