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Silicon Dioxide - SiO₂

Classification: Oxide
Atomic numbers: 14 & 8
Atomic weight: 60
Melting point (C): 600-800 (1400)
Boiling point (C): 2500 (2350)
Density (g/cm3): 2.0-2.7 (2.65)
Refractive index (n=): 1.46-1.47
Hardness (Mosh-scratch): 7
Crystal structure: Hexagonal-rhombohedral: (10T0) rhromb (alpha Qtz), (amorphous) obsidian/glass: none, (colloidal) silica suspension: none.
Color (solid): Clear/colors
Cleavage: Imperfect:none