Pickeringite

Al₂H₄₄Mg_0.93Mn_0.07O₃₈S₄

Quartieri, S.Triscari, M.Viani, A.

European Journal of Mineralogy (2000) 12, 1131-1138

a=6.1844Å   b=24.2715Å   c=21.2265Å

α=90°   β=100.326°   γ=90°