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Copper Disulfide - Cu₂S

Classification: Sulfide
Atomic numbers: 29 & 16
Atomic weight: 159.20
Melting point (C): 1100
Boiling point (C):
Density (g/cm3): 5.5-5.8
Refractive index (n=):
Hardness (Mosh-scratch): 2.5-3
Crystal structure: Orthorhombic-normal: (110) a-pinacoid, Isometric-normal >91 C: (100) cube
Color (solid): Lead grey
Cleavage: Pinacoidal-indistinct: (110), Octahedral-poor: (111)