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Mercuric Iodide - HgI₂

Classification: Iodide
Atomic numbers: 80 & 53
Atomic weight: 454.45
Melting point (C): 250
Boiling point (C): 354
Density (g/cm3): 6.27
Refractive index (n=):
Hardness (Mosh-scratch): 1-2
Crystal structure: Hexagonal-rhombohedral: (10T1) rhomb, tetragonal-normal: (100) a-pinacoid
Color (solid): Yellow-reddish
Cleavage: Basal: (0001)/(001)