Citation: Clark, J.R.; Appleman, D.E.; Papike, J.J. (1969). Crystal-Chemical Characterization of Clinopyroxenes based on Eight New Structure Refinements. Mineralogical Society of America: Special Papers, 2, pp. 31-50.
Formula: Cr Na O6 Si2
Chemical name: Na Cr Si2 O6
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Cr4 O24 Si8 (Cr O6 Si2)
Multiplicity: 1
Coordination sequences: