Citation: Matsumoto, T.; Tokonami, M.; Morimoto, N. (1975). The crystal structure of omphacite. American Mineralogist, 60, pp. 634-641.
Formula: Al0.868 Ca1.03 Fe0.317 Mg0.815 Na0.97 O12 Si4
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al2 Fe4 Mg2 O24 Si8 (Al Fe2 Mg O12 Si4)
Multiplicity: 1