the hexagonal symmetry and reduces it to monoclinic symmetry. However, the original hexahedral symmetry is discernible in the pseudohexagonal character of mica crystals. The short-range order of K⁺ ions on cleaved muscovite mica has been resolved.

Classification

Chemically, micas can be given the general formula
:X₂Y_4-6Z₈O₂₀(OH, F)₄,in which
:X is K,

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