Citation: Freed, R. L.; Peacor, D. R. (1967). Refinement of the crystal structure of johannsenite. American Mineralogist, 52, pp. 709-720.
Formula: Ca Mn O6 Si2
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Mn4 O24 Si8 (Mn O6 Si2)
Multiplicity: 1
Coordination sequences: