metamorphic
Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
Hardness: 6.5-7 (Mohs); Color: Light to dark green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Light to dark green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where small mica flakes (specifically green fuchsite) become trapped, creating a shimmering effect.
Uses & applications
Widely used for tumbled stones, beads, cabochons for jewelry, ornamental carvings, and occasionally for interior design accents.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to an 18th-century accidental discovery of 'aventurine glass'.
Field identification & locations
Identify by its characteristic green color and 'aventurescence' (shimmering metallic glints). Commonly found in India, Brazil, and Russia. Used by collectors as a common decorative heart stone or palm stone.
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