metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 (Mohs scale); Color: Pale to dark green with sparkly aventurescence; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69
- Hardness
- 7 (Mohs scale)
- Color
- Pale to dark green with sparkly aventurescence
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale to dark green with sparkly aventurescence; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69
Formation & geological history
Formed through the metamorphism of quartz-rich sedimentary rocks (quartzite) combined with mica inclusions. Most specimens are from the Precambrian or Paleozoic eras, formed under high pressure and temperature in the Earth's crust.
Uses & applications
Predominantly used for jewelry, lapidary carvings, decorative figurines, tumbled stones for metaphysical collecting, and occasionally as a surfacing material for high-end furniture.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance.' This refers to the 18th-century discovery of Goldstone glass, which looks similar to this natural mineral. Its signature shimmer is caused by platy inclusions of green Fuchsite mica.
Field identification & locations
Identify in the field by its distinct 'shimmer' or 'glitter' (aventurescence) beneath the surface, its green color, and its ability to scratch glass. It is commonly found in India, Brazil, and Russia.
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