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Magnesium Fluoride - MgF₂

Classification: Fluoride
Atomic numbers: 12 & 9
Atomic weight: 62.32
Melting point (C): 1396 (1263)
Boiling point (C): 2230 (2227)
Density (g/cm3): 2.9-3.2
Refractive index (n=): 1.378
Hardness (Mosh-scratch): 5-6
Crystal structure: Tetragonal-normal: (110) prism, 1st order
Color (solid): Colorless
Cleavage: Basal: (001)