metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions
Hardness: 6.5-7.0 (Mohs scale); Color: Green (due to Fuchsite inclusions); Luster: Vitreous to waxy; Crystal structure: Hexagonal; Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green (due to Fuchsite inclusions)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Green (due to Fuchsite inclusions); Luster: Vitreous to waxy; Crystal structure: Hexagonal; Specific gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The characteristic aventurescence is caused by platy mineral inclusions like mica or fuchsite oriented within the quartz matrix.
Uses & applications
Primarily used in jewelry (beads, cabochons), carvings, decorative ornaments, and as a popular semi-precious stone for gemstone collectors and practitioners.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the discovery of aventurine glass in the 18th century which looked similar to this natural stone. It is often mistaken for Jade.
Field identification & locations
Look for a shimmering or glistening effect (aventurescence) when the stone is turned under light. Commonly found in India, Brazil, and Russia. Collectors should check for grainy texture and mica specks.
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