data_global
_chemical_name_mineral 'Fresnoite'
loop_
_publ_author_name
'Masse R'
'Grenier J'
'Durif A'
_journal_name_full 'Bulletin de la Societe Francaise de Mineralogie et de Cristallographie'
_journal_volume 90 
_journal_year 1967
_journal_page_first 20
_journal_page_last 23
_publ_section_title
;
 Structure cristalline de la fresnoite
 _cod_database_code 1007234
;
_database_code_amcsd 0015916
_chemical_formula_sum 'Ba2 Ti Si2 O8'
_cell_length_a 8.52
_cell_length_b 8.52
_cell_length_c 5.21
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 378.196
_exptl_crystal_density_diffrn      4.450
_symmetry_space_group_name_H-M 'P 4 b m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,z'
  '-y,x,z'
  '1/2+x,1/2-y,z'
  '-x,-y,z'
  '1/2+y,1/2+x,z'
  'y,-x,z'
  '1/2-x,1/2+y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ba1   0.17300   0.67300   0.00000
Ti1   0.00000   0.00000   0.54000
Si1   0.63000   0.13000   0.52000
O1   0.09000   0.20600   0.65500
O2   0.61800   0.11800   0.21000
O3   0.50000   0.00000   0.62000
O4   0.00000   0.00000   0.16000