data_global
_chemical_name_mineral 'Perrierite-(Ce)'
loop_
_publ_author_name
'Gottardi G'
_journal_name_full 'American Mineralogist'
_journal_volume 45 
_journal_year 1960
_journal_page_first 1
_journal_page_last 14
_publ_section_title
;
 The crystal structure of perrierite
;
_database_code_amcsd 0000090
_chemical_formula_sum '(Si3.84 Al.16) Ti3.48 Fe.87 Mg.24 Ca.872 Ce2.312 La.5 Y.16 Th.192 Na.312 O22'
_cell_length_a 13.61
_cell_length_b 5.62
_cell_length_c 11.63
_cell_angle_alpha 90
_cell_angle_beta 113.47
_cell_angle_gamma 90
_cell_volume 815.963
_exptl_crystal_density_diffrn      4.801
_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
Si1   0.40850   0.00000   0.73400   0.96000   0.00823
Al1   0.40850   0.00000   0.73400   0.04000   0.00823
Si2   0.16150   0.00000   0.54600   0.96000   0.00823
Al2   0.16150   0.00000   0.54600   0.04000   0.00823
Ti   0.00000   0.25000   0.00000   1.00000   0.00823
Ti   0.27000   0.00000   0.00000   0.74000   0.00823
Fe   0.27000   0.00000   0.00000   0.12000   0.00823
Mg   0.27000   0.00000   0.00000   0.12000   0.00823
Fe   0.00000   0.50000   0.50000   0.63000   0.00823
Ca   0.00000   0.50000   0.50000   0.34000   0.00823
Ce1   0.23800   0.00000   0.26600   0.57800   0.00823
La1   0.23800   0.00000   0.26600   0.12500   0.00823
Y1   0.23800   0.00000   0.26600   0.04000   0.00823
Th1   0.23800   0.00000   0.26600   0.04800   0.00823
Ca1   0.23800   0.00000   0.26600   0.13300   0.00823
Na1   0.23800   0.00000   0.26600   0.07800   0.00823
Ce2   0.04700   0.00000   0.74200   0.57800   0.00823
La2   0.04700   0.00000   0.74200   0.12500   0.00823
Y2   0.04700   0.00000   0.74200   0.04000   0.00823
Th2   0.04700   0.00000   0.74200   0.04800   0.00823
Ca2   0.04700   0.00000   0.74200   0.13300   0.00823
Na2   0.04700   0.00000   0.74200   0.07800   0.00823
O1   0.08500   0.25000   0.19400   1.00000   0.00823
O2   0.29100   0.25000   0.12300   1.00000   0.00823
O3   0.37450   0.25000   0.40000   1.00000   0.00823
O4   0.10300   0.00000   0.99700   1.00000   0.00823
O5   0.39700   0.00000   0.00300   1.00000   0.00823
O6   0.49200   0.00000   0.66000   1.00000   0.00823
O7   0.28600   0.00000   0.65700   1.00000   0.00823
O8   0.13850   0.00000   0.39900   1.00000   0.00823