Potash Alum - KAl(SO4)2 x 12H2O

Potash Alum - KAl(SO₄)₂ x 12H₂O

Classification: Alum
Atomic numbers: 19, 13, 16, 8 & 1
Atomic weight: 333.94
Melting point (C): 82
Boiling point (C):
Density (g/cm3): 1.76
Refractive index (n=): 1.43-1.452
Hardness (Mosh-scratch): 2
Crystal structure: Isometric-normal: (111) octahedron
Color (solid): Colorless
Cleavage: Cubic: (001)