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Zirconium Dioxide - ZrO₂

Classification: Oxide
Atomic numbers: 40 & 8
Atomic weight: 123
Melting point (C): 2700
Boiling point (C):
Density (g/cm3): 5.5-6
Refractive index (n=): 2.13-2.20
Hardness (Mosh-scratch): 6.5
Crystal structure: Monoclinic-normal: (100) a-pinacoid, tetragonal-normal, >1000 C: (100) 2nd order prism
Color (solid): Colorless/tinted
Cleavage: Basal: (0001)