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Calcium Carbonate - CaCO₃

Classification: Carbonate
Atomic numbers: 20, 6 & 8
Atomic weight: 100
Melting point (C): 1339
Boiling point (C): 898.6
Density (g/cm3): 1.71
Refractive index (n=): w=1.65849, e=1.48625
Hardness (Mosh-scratch): 3
Crystal structure: Hexagonal-rhombohedral: (10T1) rhomb
Color (solid): Clear/white
Cleavage: Rhomb-perfect: (10T1)