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Muscovite - (OH)2KAl₂(AlSi₃O₁₀)

Classification: Mica
Atomic numbers: 1, 16, 13, 19 & 14
Atomic weight: 342.1
Melting point (C): 1300
Boiling point (C):
Density (g/cm3): 2.7-3
Refractive index (n=): 1.552-1.588
Hardness (Mosh-scratch): 2-2.25
Crystal structure: Monoclinic-normal: (001) pseudo-hex sheet
Color (solid): Solid: Olive-green variable, thin section: transparent/clear
Cleavage: Basal-perfect: (001)