data_global
_chemical_name_mineral 'Poldervaartite'
loop_
_publ_author_name
'Heller L'
_journal_name_full 'Acta Crystallographica'
_journal_volume 5 
_journal_year 1952
_journal_page_first 724
_journal_page_last 728
_publ_section_title
;
 The structure of dicalcium silicate alpha-hydrate
;
_database_code_amcsd 0009148
_chemical_compound_source 'synthetic Ca2SiO3OHOH'
_chemical_formula_sum 'Ca2 Si O5'
_cell_length_a 9.34
_cell_length_b 9.22
_cell_length_c 10.61
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 913.678
_exptl_crystal_density_diffrn      2.737
_symmetry_space_group_name_H-M 'P b c a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca1   0.45200   0.64000   0.75400
Ca2   0.38500   0.02200   0.43000
Si1   0.75400   0.30400   0.97500
O1   0.43900   0.35800   0.66200
O2   0.59500   0.33600   0.92800
O3   0.80900   0.17400   0.88600
O4   0.86500   0.43400   0.96600
O5   0.73900   0.27100   0.12400