AM_Brownmillerite_3 Formula: Ca2 (Fe1.724 Al.276) O5 Name: Brownmillerite Unit cell: 5.4071 14.6949 5.5941 90.0 90.0 90.0 , V=444.49 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)