Citation: Belokoneva, E. L.; Pletnev, P. A.; Spiridonov, E. M. (1997). Crystal structure of low-manganese tinzenite (severginite) Note: O2 position not included in the paper, so we deduced it from the reported bondlengths Locality: Tungatarovskoe manganese deposit, Izhevsk, Udmurt Republic, Russia. Crystallography Reports, 42, pp. 934-937.
Formula: Al1.8 B Ca1.65 Fe0.2 H Mg0.1 Mn1.2 O16 Si4