Aegirine Ballet O, Coey J M D, Fillion G, Ghose A, Hewat A W, Regnard J R Physics and Chemistry of Minerals 16 (1989) 672-677 Magnetic order in acmite; NaFeSi2O6 Sample: T = 14 K _database_code_amcsd 0007464 9.68 8.83 5.30 90 107.3 90 C2/c atom x y z occ FeM1 0 .8991 .25 .992 NaM2 0 .2971 .25 .978 Si .2890 .0918 .2377 .98 O1 .1141 .0791 .1387 O2 .3592 .2559 .3010 O3 .3540 .0072 .0113