metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale). Color: translucent to opaque green with silvery sheen. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None. Specific Gravity: 2.64-2.69.
- Hardness
- 6
- Color
- translucent to opaque green with silvery sheen
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: translucent to opaque green with silvery sheen. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal). Cleavage: None. Specific Gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of sandstone or siltstone into quartzite, involving the inclusion of mica flakes (Fuchsite) which provide the green color and aventurescence.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), carvings, tumble stones, and as an ornamental stone in gardening or tiling.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura', meaning 'by chance,' referring to an 18th-century accidental discovery of aventurine glass. The sparkle seen in the stone is specifically known as aventurescence.
Field identification & locations
Identify by its characteristic green color combined with sparkling mica inclusions visible just beneath the surface. It is commonly found in India, Brazil, Russia, and Tanzania.
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