metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5–7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.64–2.69. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
- Hardness
- 6
- Color
- Pale green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.64–2.69. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Formed as a quartzite through regional metamorphism where quartz-rich sandstones are subjected to high pressure and temperature. The green color is derived from inclusions of chromium-rich mica called fuchsite. Geological age varies by deposit location.
Uses & applications
Primarily used in jewelry (beads, cabochons), carvings, ornamental objects, and as a popular 'healing stone' in metaphysical communities. Can also be used for interior design accents.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the 18th-century accidental discovery of 'aventurine glass' or goldstone, which looks similar to the natural mineral.
Field identification & locations
Identify in the field by its green color, sandpaper-like texture in raw form, and the presence of 'sparkles' (aventurescence) when turned in the light. Commonly found in India (the largest producer), Brazil, Russia, and Austria.
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