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: Gamma phase, T = 295 K
;
_database_code_amcsd 0009928
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na2 C O3'
_cell_length_a 8.920
_cell_length_b 5.245
_cell_length_c 6.050
_cell_angle_alpha 90
_cell_angle_beta 101.35
_cell_angle_gamma 90
_cell_volume 277.516
_exptl_crystal_density_diffrn      2.537
_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   0.01731
Na2   0.00000   0.00000   0.50000   0.01673
Na3   0.17055   0.50000   0.74801   0.02554
C   0.16446   0.50000   0.24914   0.01155
O1   0.10159   0.29384   0.28535   0.02607
O2   0.28987   0.50000   0.17757   0.02274
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 0.01757 0.01860 0.01713 0.00000 0.00672 0.00000
Na2 0.01919 0.01561 0.01686 0.00000 0.00714 0.00000
Na3 0.02174 0.02568 0.03070 0.00000 0.00888 0.00000
C 0.01110 0.01219 0.01190 0.00000 0.00370 0.00000
O1 0.03180 0.01881 0.02990 -0.00956 0.01172 0.00055
O2 0.01480 0.03240 0.02370 0.00000 0.01040 0.00000