what is the chemical formula for mica?
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The general formula for minerals of the micagroup is XY 2–3Z 4O 10(OH, F) 2 with X = K, Na, Ba, Ca, Cs, (H 3O), (NH 4); Y = Al, Mg, Fe2+, Li, Cr, Mn, V, Zn; and Z = Si, Al, Fe 3+, Be, Ti. Few natural micas have end-member compositions.
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