data_global
_chemical_name_mineral 'Niter'
loop_
_publ_author_name
'Nimmo J'
'Lucas B'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 32 
_journal_year 1976
_journal_page_first 1968
_journal_page_last 1971
_publ_section_title
;
 The crystal structures of gamma- and beta-KNO3 and
 the alpha-gamma-beta phase transformations
 _cod_database_code 1000051
;
_database_code_amcsd 0009568
_chemical_formula_sum 'K N O3'
_cell_length_a 5.487
_cell_length_b 5.487
_cell_length_c 9.156
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 238.730
_exptl_crystal_density_diffrn      2.110
_symmetry_space_group_name_H-M 'R 3 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '2/3+x,1/3+y,1/3+z'
  '1/3+x,2/3+y,2/3+z'
  'x,x-y,z'
  '2/3+x,1/3+x-y,1/3+z'
  '1/3+x,2/3+x-y,2/3+z'
  '-y,-x,z'
  '2/3-y,1/3-x,1/3+z'
  '1/3-y,2/3-x,2/3+z'
  '-x+y,y,z'
  '2/3-x+y,1/3+y,1/3+z'
  '1/3-x+y,2/3+y,2/3+z'
  '-y,x-y,z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  '-x+y,-x,z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K   0.00000   0.00000   0.00000
N   0.00000   0.00000   0.40500
O   0.13100  -0.13100   0.43400