Armbrusterite

H₄₆K₅Mn₁₅Na₆O_104.02Si₃₆

Yakovenchuk, V. N.Krivovichev, S. K.Pakhomovsky, Y. A.Ivanyuk, G. Y.Selivanova, E. A.Men'shikov, Y. P.Britvin, S. N.

American Mineralogist (2007) 92, 416-423

a=17.333Å   b=23.539Å   c=13.4895Å

α=90°   β=115.069°   γ=90°