metamorphic
Blue Aventurine
Quartzite with Dumortierite inclusions (SiO2)
Hardness: 7 (Mohs scale); Color: Deep blue to indigo; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None; Specific gravity: 2.6–2.7
- Hardness
- 7 (Mohs scale)
- Color
- Deep blue to indigo
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Deep blue to indigo; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None; Specific gravity: 2.6–2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstones where inclusions of fibrous Dumortierite provide the blue coloration. It originates in metamorphic terrains across various geological ages.
Uses & applications
Primarily used for ornamental carvings, polished cabochons, metaphysical practices, and as a decorative collector's stone.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to Italian glass with copper inclusions. Blue aventurine is less common than the green variety.
Field identification & locations
Identify by its deep blue hue and 'aventurescence' (a shimmering effect caused by mineral inclusions). Commonly found in Brazil, India, and Russia. Collectors should look for uniform color and absence of fractures.
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