data_global
_chemical_name_mineral 'Natrite'
loop_
_publ_author_name
'Dusek M'
'Chapuis G'
'Meyer M'
'Petricek V'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 59 
_journal_year 2003
_journal_page_first 337
_journal_page_last 352
_publ_section_title
;
 Sodium carbonate revisited
 Sample: Delta phase, T = 110 K
;
_database_code_amcsd 0009929
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na2 C O3'
_cell_length_a 8.898
_cell_length_b 5.237
_cell_length_c 5.996
_cell_angle_alpha 90
_cell_angle_beta 101.87
_cell_angle_gamma 90
_cell_volume 273.432
_exptl_crystal_density_diffrn      2.575
_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_U_iso_or_equiv
Na1   0.00000   0.00000   0.00000   0.00886
Na2   0.00000   0.00000   0.50000   0.00855
Na3   0.17125   0.50000   0.74784   0.01267
C   0.16454   0.50000   0.24887   0.00695
O1   0.10175   0.29345   0.28667   0.01312
O2   0.28941   0.50000   0.17472   0.01135
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na1 0.00927 0.00910 0.00885 0.00000 0.00338 0.00000
Na2 0.01018 0.00779 0.00831 0.00000 0.00332 0.00000
Na3 0.01204 0.01238 0.01448 0.00000 0.00482 0.00000
C 0.00710 0.00690 0.00720 0.00000 0.00232 0.00000
O1 0.01620 0.00969 0.01463 -0.00452 0.00584 0.00021
O2 0.00874 0.01506 0.01150 0.00000 0.00509 0.00000