data_global
_amcsd_formula_title 'Na(NH4)CrO4*2H2O'
loop_
_publ_author_name
'Khan A A'
'Baur W H'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 28 
_journal_year 1972
_journal_page_first 683
_journal_page_last 693
_publ_section_title
;
 Salt hydrates. VIII. The crystal structures of sodium ammonium orthochromate
 dihydrate and magnesium diammonium bis(hydrogen orthophosphate) tetrahydrate
 and a discussion of the ammonium ion
;
_database_code_amcsd 0009428
_chemical_formula_sum 'Na N Cr O6 H4'
_cell_length_a 8.413
_cell_length_b 13.039
_cell_length_c 6.219
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 682.206
_exptl_crystal_density_diffrn      1.840
_symmetry_space_group_name_H-M 'P 21 21 21'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,1/2+y,1/2-z'
  '1/2+x,1/2-y,-z'
  '1/2-x,-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Na   0.26100   0.49000   0.90000   0.03166
NH4   0.15600   0.85600   0.37600   0.03293
Cr   0.09700   0.12810   0.38320   0.02406
O1   0.08100   0.20600   0.18300   0.03926
O2   0.08200   0.18900   0.60700   0.04559
O3   0.27200   0.07200   0.37500   0.05066
O4   0.03900   0.53900   0.13400   0.03673
Wat5   0.19700   0.63300   0.67100   0.03546
Wat6   0.09000   0.40400   0.65400   0.03040