TAFIKS GROUP OF COMPANIES
Quartz
| Property | Specification |
| Chemical Formula | SiO₂ (Silicon Dioxide) |
| Crystal System | Hexagonal (trigonal) |
| Crystal Habit | Prismatic, hexagonal crystals, masses |
| Color | Colorless, white, purple, pink, brown, black |
| Streak | White |
| Luster | Vitreous (glassy) |
| Transparency | Transparent to translucent |
| Hardness (Mohs scale) | 7 |
| Specific Gravity | 2.65 |
| Cleavage | None |
| Fracture | Conchoidal |
| Refractive Index | 1.544 - 1.553 |
| Birefringence | 0.009 |
| Optical Properties | Uniaxial (+) |
| Piezoelectricity | Yes |
| Thermal Conductivity | ~1.3 W/m·K (at 300 K) |
| Melting Point | 1,670 °C (3,038 °F) |