data_global
_chemical_name_mineral 'Corundum'
loop_
_publ_author_name
'Saalfeld H'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 120 
_journal_year 1964
_journal_page_first 342
_journal_page_last 348
_publ_section_title
;
 Strukturuntersuchungen im system Al2O3-Cr2O3
;
_database_code_amcsd 0010607
_chemical_formula_sum '(Al1.82 Cr.18) O3'
_cell_length_a 5.128
_cell_length_b 5.128
_cell_length_c 5.128
_cell_angle_alpha 55.27
_cell_angle_beta 55.27
_cell_angle_gamma 55.27
_cell_volume 84.870
_exptl_crystal_density_diffrn      4.166
_symmetry_space_group_name_H-M 'R -3 c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,1/2-z,1/2-y'
  '-z,-x,-y'
  '1/2+y,1/2+x,1/2+z'
  'y,z,x'
  '1/2-z,1/2-y,1/2-x'
  '-x,-y,-z'
  '1/2+x,1/2+z,1/2+y'
  'z,x,y'
  '1/2-y,1/2-x,1/2-z'
  '-y,-z,-x'
  '1/2+z,1/2+y,1/2+x'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Al   0.14500   0.14500   0.14500   0.91000
Cr   0.14500   0.14500   0.14500   0.09000
O  -0.05300   0.25000   0.55300   1.00000