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Cristobalite - SiO₂

Classification: Oxide
Atomic numbers: 14 & 8
Atomic weight: 60.08
Melting point (C): >1200
Boiling point (C):
Density (g/cm3): 2.27
Refractive index (n=): 1.486
Hardness (Mosh-scratch): 7
Crystal structure: Tetragonal-normal alpha: (110) prism, Isometric-normal beta: (111) octahedron
Color (solid): White
Cleavage: Cubic-poor: (001)