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Copper Oxide - Cu₂O

Classification: Oxide
Atomic numbers: 29 & 8
Atomic weight: 143.14
Melting point (C): 1235
Boiling point (C): 1800
Density (g/cm3): 5.85-6.15
Refractive index (n=): 2.849
Hardness (Mosh-scratch): 3.5-4
Crystal structure: Isometric-plagiohedral: (111) octahedron
Color (solid): Solid: Black (CuO), solid: copper-red (Cu2O), flame: emerald green
Cleavage: Cubbic-interrupted: (001)