Brownmillerite Redhammer G J, Tippelt G, Roth G, Amthauer G American Mineralogist 89 (2004) 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) Sample: bht50_2 Locality: synthetic _database_code_amcsd 0003434 5.3832 14.6214 5.5916 90 90 90 I2mb atom x y z occ Uiso Ca .4912 .10820 .02655 .0063 FeM .0011 0 0 .849 .0030 AlM .0011 0 0 .151 .0030 FeT .9523 .25 .9300 .561 .0023 AlT .9523 .25 .9300 .439 .0023 O1 .2494 .98593 .2531 .0060 O2 .0238 .1426 .0697 .0085 O3 .6102 .25 .8677 .0072