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Bismuth Selenide - Bi₂Se₃

Classification: Selenide
Atomic numbers: 83 & 34
Atomic weight: 654.9
Melting point (C): 710
Boiling point (C):
Density (g/cm3): 6.25-6.98
Refractive index (n=):
Coefficient of thermal expansion (x exp10(-6) cm/cm/C):
Hardness (Mosh-scratch): 2.5-3.5
Crystal structure: Orthorhombic-normal: (010) b-pinacoid
Color (solid): Bluish grey
Cleavage: Pinacoidal-distinct: b(010)