data_global
_chemical_name_mineral 'Rickardite'
loop_
_publ_author_name
'Forman S A'
'Peacock M A'
_journal_name_full 'American Mineralogist'
_journal_volume 34 
_journal_year 1949
_journal_page_first 441
_journal_page_last 451
_publ_section_title
;
 Crystal structure of rickardite, Cu4-xTe2
;
_database_code_amcsd 0000047
_chemical_formula_sum 'Cu1.4 Te'
_cell_length_a 3.98
_cell_length_b 3.98
_cell_length_c 6.12
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 96.943
_exptl_crystal_density_diffrn      7.419
_symmetry_space_group_name_H-M 'P 4/n m m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-y,1/2-x,z'
  'y,x,-z'
  'y,-x,-z'
  '1/2-y,1/2+x,z'
  'x,-y,z'
  '1/2-x,1/2+y,-z'
  '1/2+x,1/2+y,-z'
  '-x,-y,z'
  '1/2+y,1/2+x,z'
  '-y,-x,-z'
  '-y,x,-z'
  '1/2+y,1/2-x,z'
  '-x,y,z'
  '1/2+x,1/2-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
Cu1   0.00000   0.00000   0.00000   1.00000
Cu2   0.00000   0.50000   0.27000   0.40000
Te   0.00000   0.50000   0.71500   1.00000