Citation: Clark, J. R.; Papike, J. J. (1968). Crystal-chemical characterization of omphacites. American Mineralogist, 53, pp. 840-868.
Formula: Al0.885 Ca1.165 Fe0.31 Mg0.805 Na0.835 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