AM_Omphacite_3
Formula: Fe.082 Al.758 Mg.205 Ca.286 Na.602 Si2 O6
Name: Omphacite
Unit cell: 9.501 8.654 5.238 90.0 107.23 90.0 , V=411.35
Space group: C12/C1 (15)

McCormick T C , American Mineralogist , 71 (1986) p.1434-1440, Crystal-chemical aspects of nonstoichiometric pyroxenes, Sample: Vacancy model I