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Chromium Trioxide - Cr₂O₃

Classification: Oxide
Atomic numbers: 24 & 8
Atomic weight: 152.03
Melting point (C): 1990
Boiling point (C):
Density (g/cm3): 5.21
Hardness (Mosh-scratch): 8-9
Crystal structure: Hexagonal-normal: (10T0) prism
Color (solid): Green
Cleavage: (0001)