Citation: Redhammer, G.J.; Roth, G. (2002). Single-crystal structure refinements and crystal chemistry of synthetic trioctahedral micas K M3 (Al(3+), Si(3+))4 O10 = Ni(2+), Mg(2+), Co(2+), Fe(2+) or Al(3+). American Mineralogist, 87, pp. 1464-1476.
Formula: Al2.209 Fe2.301 H2 K O12 Si2.49
Chemical name:K (Fe2.301 Al0.699) (Al1.51 Si2.49 O10) (O H)2