AM_Omphacite_7 Formula: (Ca.5 Na.5) Mg.46 Al.51 Fe.06 Si1.97 O6 Name: Omphacite Unit cell: 9.569 8.759 5.256 90.0 106.96 90.0 , V=421.37 Space group: P12/N1 (13)

Pavese A , Bocchio R , Ivaldi G , Mineralogical Magazine , 64 (2000) p.983-993, In situ high temperature single crystal X-ray diffraction study of a natural omphacite, Locality: Gorduno, Lepontine Alps, Switzerland, Note: structure at room temperature (T=298K)