Citation: Armbruster, T.; Hetherington, C.J.D.; Berlepsch, P.; Gnos, E. (2002). Crystal chemistry and structure refinements of barian muscovites from the Berisal complex, Simplon region, Switzerland. Schweizerische Mineralogische und Petrographische Mitteilungen, 82, pp. 537-547.
Formula: Al2.94 Ba0.05 H2 K0.74 Na0.2 O12 Si3.06
Chemical name:(K0.74 Na0.20 Ba0.05) Al2 (Si3.06 Al0.94 O10) (O H)2