metamorphic
Aventurine Quartz
Silicon dioxide with inclusions (KAl2(AlSi3O10)(OH,F)2)
Hardness: 6.5-7 (Mohs), Color: Pale to medium green, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: None, Specific gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Pale to medium green, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: None, Specific gravity: 2.64-2.69
Formation & geological history
Forms in metamorphic environments where quartz sandstone is subjected to heat and pressure, with high concentrations of fuchsite (green mica) providing the color. Often found in Precambrian and Paleozoic formations.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), ornamental figurines, and as a popular 'healing stone' in metaphysical practices.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura' meaning 'by chance,' referencing the discovery of aventurine glass in the 18th century which mimics the natural stone's shimmer.
Field identification & locations
Identify by its 'aventurescence' (a metallic glitter or shimmer caused by mica platelets). Commonly found in India, Brazil, and Russia. It can be distinguished from jade by its lower toughness and shimmering inclusions.
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