data_global
_chemical_name_mineral 'Brownmillerite'
loop_
_publ_author_name
'Redhammer G J'
'Tippelt G'
'Roth G'
'Amthauer G'
_journal_name_full 'American Mineralogist'
_journal_volume 89 
_journal_year 2004
_journal_page_first 405
_journal_page_last 420
_publ_section_title
;
 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: bht095_2
;
_database_code_amcsd 0003437
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Ca2 (Fe1.134 Al.866) O5'
_cell_length_a 5.3510
_cell_length_b 14.5256
_cell_length_c 5.5685
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 432.820
_exptl_crystal_density_diffrn      3.788
_symmetry_space_group_name_H-M 'I 2 m b'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'x,1/2+y,-z'
  '1/2+x,+y,1/2-z'
  'x,1/2-y,z'
  '1/2+x,-y,1/2+z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Ca   0.49130   0.10859   0.02718   1.00000   0.00620
FeM   0.00050   0.00000   0.00000   0.78300   0.00370
AlM   0.00050   0.00000   0.00000   0.21700   0.00370
FeT   0.95270   0.25000   0.92830   0.35100   0.00270
AlT   0.95270   0.25000   0.92830   0.64900   0.00270
O1   0.24940   0.98640   0.25290   1.00000   0.00620
O2   0.02160   0.14330   0.06860   1.00000   0.00880
O3   0.61460   0.25000   0.86330   1.00000   0.00700