AM_Brownmillerite_7 Formula: Ca2 (Fe1.54 Al.46) O5 Name: Brownmillerite Unit cell: 5.3876 14.6302 5.5877 90.0 90.0 90.0 , V=440.43 Space group: PNMA (62)

Redhammer G J , Tippelt G , Roth G , Amthauer G , American Mineralogist , 89 (2004) p.405-420, Structural variations in the brownmillerite series Ca2(Fe2-xAlx)O5:, Single-crystal X-ray diffraction at 25 deg C and high temperature, X-ray powder diffraction (25 C <= T <= 1000 C)