metamorphic
Blue Quartzite (Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 7 (Mohs scale); Color: Light blue to lavender-blue; Luster: Vitreous to waxy; Structure: Granular/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.7
- Hardness
- 7 (Mohs scale)
- Color
- Light blue to lavender-blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Light blue to lavender-blue; Luster: Vitreous to waxy; Structure: Granular/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 - 2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. High heat and pressure reciprocal to tectonic activity cause quartz grains to recrystallize, often trapping Dumortierite or Crocidolite inclusions which provide the blue hue.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, countertops, and luxury interior flooring due to its high durability and aesthetic appeal.
Geological facts
While pure quartzite is white or gray, the 'Blue Aventurine' variety gets its name from its shimmering effect (aventurescence) caused by light reflecting off platy mineral inclusions.
Field identification & locations
Identify in the field by its inability to be scratched by steel, its sugary/granular crystalline appearance on broken surfaces, and its origin in metamorphic belts. Major deposits are found in Brazil, India, and South Africa.
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