data_global
_amcsd_formula_title 'Eu.92Al1.76Si2.24O8'
loop_
_publ_author_name
'Kimata M'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 52 
_journal_year 1988
_journal_page_first 257
_journal_page_last 265
_publ_section_title
;
 The crystal structure of non-stoichiometric Eu-anorthite:
 an explanation of the Eu-positive anomaly
;
_database_code_amcsd 0014487
_chemical_formula_sum 'Eu.92 (Al1.76 Si2.24) O8'
_cell_length_a 8.373
_cell_length_b 12.959
_cell_length_c 7.124
_cell_angle_alpha 90
_cell_angle_beta 115.51
_cell_angle_gamma 90
_cell_volume 697.635
_exptl_crystal_density_diffrn      3.601
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-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
Eu   0.26935   0.00000   0.13114   0.92000   0.01995
Al1   0.00508   0.17674   0.22466   0.47000   0.01350
Si1   0.00508   0.17674   0.22466   0.53000   0.01350
Al2   0.68983   0.11664   0.34260   0.41000   0.01241
Si2   0.68983   0.11664   0.34260   0.59000   0.01241
OA1   0.00000   0.13110   0.00000   1.00000   0.01785
OA2   0.59262   0.00000   0.28742   1.00000   0.01681
OB   0.81856   0.12704   0.21942   1.00000   0.02438
OC   0.01577   0.30427   0.24947   1.00000   0.02271
OD   0.19207   0.12259   0.40145   1.00000   0.02034
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Eu 0.00836 0.02357 0.02390 0.00000 0.00320 0.00000
Al1 0.00963 0.01166 0.01644 -0.00207 0.00300 -0.00017
Si1 0.00963 0.01166 0.01644 -0.00207 0.00300 -0.00055
Al2 0.00929 0.01157 0.01412 0.00099 0.00295 -0.00055
Si2 0.00929 0.01157 0.01412 0.00099 0.00295 -0.00055
OA1 0.01640 0.01914 0.01581 0.00000 0.00487 0.00000
OA2 0.01082 0.00995 0.02748 0.00000 0.00615 0.00000
OB 0.02164 0.01931 0.02938 -0.00451 0.00834 0.00013
OC 0.01603 0.01906 0.03120 -0.00268 0.00844 0.00409
OD 0.01608 0.02229 0.01918 -0.00035 0.00433 0.00135