Citation: Hassan, I.; Grundy, H. D. (1985). The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2. American Mineralogist, 70, pp. 186-192.
Formula: Be3 Mn4 O12 S Si3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Mn8 O24 S2 Si6 (Mn4 O12 S Si3)
Multiplicity: 1
Coordination sequences: