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Cesium Iodide - CsI

Classification: Iodide
Atomic numbers: 55 & 53
Atomic weight: 259.83
Melting point (C): 621
Boiling point (C): 1280
Density (g/cm3): 4.52
Refractive index (n=): 1.7876
Hardness (Mosh-scratch): 2-3
Crystal structure: Isometric-normal: (100) cube
Color (solid): Clear
Cleavage: Cubic: (001)