quartz
Quartz - Crystalline silica (SiO₂), a network_solid with tetrahedral structure. Shows polymorphism.
Structure:
- Si-O-Si angle: 144°
- Si-O length: 1.61 Å
- crystal_system: trigonal
- Density: 2.65 g/cm³
Transitions:
- α → β at 573°C
- Tridymite: 867°C
- Cristobalite: 1470°C
- Melting: 1713°C
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