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Thallium Selenide - Tl₂Se

Classification: Selenide
Atomic numbers: 81 & 34
Atomic weight: 487.74
Melting point (C): 340
Boiling point (C):
Density (g/cm3):
Refractive index (n=):
Hardness (Mosh-scratch): 4-5
Crystal structure: Isometric-normal: (100) cube
Color (solid): Grey
Cleavage: Cubic: (001)