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Quartz - SiO₂

Classification: Oxide
Atomic numbers: 14 & 8
Atomic weight: 60.06
Melting point (C): 1470
Boiling point (C): 2230 (2500)
Density (g/cm3): 2.6-2.66
Refractive index (n=): 1.54418/1.55328
Hardness (Mosh-scratch): 7
Crystal structure: Hexagonal-rhombohedral: (10T1) rhomb
Color (solid-rock crystal): Colorless
Cleavage: Rhomb-indistinct: r(10T1)
Fracture (solid): Conhoidal