data_global
_chemical_name_mineral 'Natrite'
loop_
_publ_author_name
'Arakcheeva A'
'Bindi L'
'Pattison P'
'Meisser N'
'Chapuis G'
'Pekov I'
_journal_name_full 'American Mineralogist'
_journal_volume 95 
_journal_year 2010
_journal_page_first 574
_journal_page_last 581
_publ_section_title
;
 The incommensurately modulated structures of natural natrite at 120
 and 293 K from synchrotron X-ray data
 T = 293 K
;
_database_code_amcsd 0005044
_chemical_compound_source 'Mt. Koashva, Lovozero massif, Kola peninsula, Russia'
_chemical_formula_sum 'Na1.947 C O3'
_cell_length_a 8.8818
_cell_length_b 5.235
_cell_length_c 6.0455
_cell_angle_alpha 90
_cell_angle_beta 101.464
_cell_angle_gamma 90
_cell_volume 275.485
_exptl_crystal_density_diffrn      2.526
_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_occupancy
_atom_site_U_iso_or_equiv
Na1   0.00000   0.00000   0.00000   0.97800   0.01890
Na2   0.00000   0.00000   0.50000   0.97500   0.01820
Na3   0.17065   0.50000   0.74801   0.97000   0.02640
C   0.16426   0.50000   0.24910   1.00000   0.01330
O1   0.10165   0.29451   0.28529   1.00000   0.02830
O2   0.28932   0.50000   0.17760   1.00000   0.02570