metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5–7; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.63–2.69
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.63–2.69
Formation & geological history
Formed as a metamorphic quartzite which crystallized over millions of years under high pressure and temperature. The green color is primarily caused by platy inclusions of chromium-rich mica (fuchsite) during its formation.
Uses & applications
Predominantly used for lapidary work, jewelry, ornamental carvings, and as a popular 'healing stone' in metaphysical collections. Occasionally used as an architectural stone.
Geological facts
It is famous for the 'aventurescence' effect, which is the shimmering or glistening caused by tiny inclusions reflecting light. The name is derived from the Italian word 'a ventura', meaning 'by chance'.
Field identification & locations
Identify by its distinct glistening schiller effect (aventurescence) when turned under light. Found commonly in Brazil, India, Russia, and Tanzania. Unlike jade, it often has a more grainy, sugary appearance on raw surfaces.
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