metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5–7 Mohs; Color: Pale to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64–2.69
- Hardness
- 6
- Color
- Pale to dark green with a shimmering effect
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 Mohs; Color: Pale to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64–2.69
Formation & geological history
Formed in metamorphic rocks where quartz is recrystallized under heat and pressure, with platelike mineral inclusions (usually chromiferous mica/fuchsite) creating its green color and shimmer.
Uses & applications
Used primarily in jewelry as beads, cabochons, and carvings, as well as for decorative items and popular metaphysical collecting.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura' meaning 'by chance,' referencing the discovery of aventurine glass or goldstone, which looks similar to this natural stone. The shimmering effect is called aventurescence.
Field identification & locations
Identify by its characteristic green color and 'aventurescence' (metallic glitters caused by mica). It is commonly found in India, Brazil, and Russia. Collectors look for even color distribution and strong shimmer.
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