Citation: Simonov, M.A.; Belokoneva, E.L.; Egorov-Tismenko, Yu.K.; Belov, N.V. (1977). The crystal structures of natural rhodonite Ca Mn4 (Si5 O15) and synthetic Na H Cd4 (Ge5 O15) and Li H Cd4 (Ge5 O15). Doklady Akademii Nauk SSSR, 234, pp. 586-589.