AM_Aegirine_27 Formula: (Na.75 Ca.25) Fe Si2 O6 Name: Aegirine Unit cell: 9.6977 8.8519 5.2861 90.0 106.765 90.0 , V=434.49 Space group: C12/C1 (15)

Redhammer G J , Amthauer G , Lottermoser W , Treutmann W , European Journal of Mineralogy , 12 (2000) p.105-120, Synthesis and structural properties of clinopyroxenes of the, hedenbergite CaFeSi2O6 - aegirine NaFeSi2O6 solid-solution series, Sample: ae75/20