data_global
_chemical_name_mineral 'Tarapacaite'
loop_
_publ_author_name
'Zachariasen W'
'Ziegler G'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 80 
_journal_year 1931
_journal_page_first 164
_journal_page_last 173
_publ_section_title
;
 The crystal structure of potassium chromate K2 Cr O4
 _cod_database_code 1011186
;
_database_code_amcsd 0018061
_chemical_formula_sum 'K2 Cr O4'
_cell_length_a 5.92
_cell_length_b 10.4
_cell_length_c 7.61
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 468.532
_exptl_crystal_density_diffrn      2.753
_symmetry_space_group_name_H-M 'P m c n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,y,z'
  '1/2+x,-y,-z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.25000   0.08300   0.35500
K2   0.25000  -0.30600   0.50000
Cr1   0.25000   0.08300  -0.23100
O1   0.25000   0.08300  -0.01900
O2   0.25000  -0.06100  -0.30000
O3   0.02800   0.15600  -0.30000