data_global
_chemical_name_mineral 'Weeksite'
loop_
_publ_author_name
'Baturin S V'
_journal_name_full 'Doklady Akademii Nauk SSSR'
_journal_volume 282 
_journal_year 1985
_journal_page_first 1132
_journal_page_last 1136
_publ_section_title
;
 Crystal-structure of weeksite
;
_database_code_amcsd 0018510
_chemical_formula_sum 'U Si2.5 O10 K.62 Na.38 H3'
_cell_length_a 7.092
_cell_length_b 17.888
_cell_length_c 7.113
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 902.367
_exptl_crystal_density_diffrn      3.712
_symmetry_space_group_name_H-M 'C m m m'
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'
  '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
U   0.00000   0.19820   0.00000   1.00000   0.01456
Si1   0.00000   0.37440   0.00000   1.00000   0.01393
Si2   0.00000   0.00000   0.11700   0.50000   0.01267
Si3   0.09500   0.50000   0.28200   0.50000   0.01393
O1   0.00000   0.19900   0.24800   1.00000   0.01393
O2   0.17400   0.31600   0.00000   1.00000   0.01646
O3   0.00000   0.42700   0.19000   1.00000   0.03040
O4   0.00000   0.07100   0.00000   1.00000   0.13932
O5   0.00000   0.50000   0.50000   1.00000   0.03673
O6   0.17900   0.00000   0.26800   0.50000   0.03546
Wat1   0.00000   0.00000   0.50000   1.00000   0.08106
Wat2   0.17900   0.32500   0.50000   0.50000   0.04813
K   0.17900   0.32500   0.50000   0.31000   0.04813
Na   0.17900   0.32500   0.50000   0.19000   0.04813