Images Formulae: fluorapophyllite-(Cs): CsCa4(Si8O20)F(H2O)8 fluorapophyllite-(K): KCa4Si8O20F.8H2O fluorapophyllite-(Na): NaCa4Si8O20F.8H2O fluorapophyllite-(NH4): (NH4)Ca4Si8O20F.8H2O Back to Minerals