data_global
_chemical_name_mineral 'Stokesite'
loop_
_publ_author_name
'Vorma A'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 33 
_journal_year 1963
_journal_page_first 615
_journal_page_last 617
_publ_section_title
;
 Crystal structure of stokesite, CaSnSi3O9*2H2O
;
_database_code_amcsd 0014440
_chemical_formula_sum 'Ca Sn Si3 O11 H4'
_cell_length_a 14.465
_cell_length_b 11.625
_cell_length_c 5.235
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 880.295
_exptl_crystal_density_diffrn      3.192
_symmetry_space_group_name_H-M 'P n n a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,1/2+y,1/2+z'
  'x,1/2-y,1/2-z'
  '1/2+x,y,-z'
  '1/2-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca   0.40000   0.25000   0.75000
Sn   0.00000   0.00000   0.50000
Si1   0.06480   0.25000   0.75000
Si2   0.14150   0.03170   0.00000
O1   0.11750   0.00900   0.29500
O2   0.13150   0.16680   0.91900
O3   0.42350   0.04800   0.81300
O4   0.00100   0.17200   0.57050
Wat   0.28700   0.17700   0.47800
O5   0.25000   0.00000   0.95200