metamorphic
Blue Quartzite (Blue Aventurine)
SiO2 (Silicon Dioxide with Dumortierite/Crocidolite inclusions)
Hardness: 7 (Mohs scale); Color: Pale to deep blue; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Pale to deep blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale to deep blue; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The blue coloration typically results from inclusions of blue minerals like dumortierite or fibrous amphiboles trapped during recrystallization.
Uses & applications
Used primarily in jewelry as tumbled stones or cabochons, decorative carvings, aquarium gravel, and as ornamental landscaping stone.
Geological facts
Unlike Blue Lace Agate which shows banding, Blue Quartzite has a more uniform, grainy crystalline appearance. It is often referred to as 'Blue Aventurine' when it exhibits a shimmering effect (aventurescence).
Field identification & locations
Identify by its hardness (will scratch glass) and lack of distinct banding found in chalcedony. Commonly found in Brazil, India, and South Africa. For collectors, look for deep color and high translucency.
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