Citation: Redhammer, G. J.; Tippelt, G.; Roth, G.; Amthauer, G. (2004). 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) Sample: bht120n2. American Mineralogist, 89, pp. 405-420.