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Talc - H₂Mg₃(SiO₃)₄

Classification: Silicate
Atomic numbers: 1, 12, 14 & 8
Atomic weight: 418
Melting point (C): >1500
Boiling point (C):
Density (g/cm3): 2.7-2.8
Refractive index (n=): 1.539-1.589
Hardness (Mosh-scratch): 1-1.5
Crystal structure: Orthorhombic-normal: (100) pinacoid, monoclinic-normal: (100) pinacoid
Color (solid): White/greenish
Cleavage: Basal-perfect: (001)