metamorphic
Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Green (due to Fuchsite), Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Green (due to Fuchsite), Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock (Quartzite) from sandstone, where high heat and pressure fuse quartz grains. The green color comes from platy inclusions of chromium-rich mica (fuchsite) during the metamorphic process.
Uses & applications
Mainly used for decorative purposes including jewelry (beads, cabochons), ornamental carvings, figurines, and as a common stone for tumbling and crystal healing practices.
Geological facts
Aventurine is famous for its 'aventurescence,' a shimmering effect caused by light reflecting off tiny mineral inclusions within the quartz. The name comes from the Italian 'a ventura,' meaning 'by chance.'
Field identification & locations
Identify by its characteristic soapy feel despite being hard, and its distinctive metallic shimmering inclusions. It is commonly found in India, Brazil, Russia, and Austria.
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