data_global
_amcsd_formula_title 'Cu2 Er0.667 S2'
loop_
_publ_author_name
'Ballestracci R'
'Bertaut E'
_journal_name_full 'Bulletin de la Societe Francaise de Mineralogie et de Cristallographie'
_journal_volume 88 
_journal_year 1965
_journal_page_first 575
_journal_page_last 579
_publ_section_title
;
 Etude cristallographique de nouveaux sulfures de terres rares et de cuivre(I)
 _cod_database_code 1008078
;
_database_code_amcsd 0016020
_chemical_formula_sum 'Er.667 S2 Cu2'
_cell_length_a 3.874
_cell_length_b 3.874
_cell_length_c 6.332
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 82.298
_exptl_crystal_density_diffrn      6.108
_symmetry_space_group_name_H-M 'P -3'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,-x+y,-z'
  '-x+y,-x,z'
  '-x,-y,-z'
  '-y,x-y,z'
  'x-y,x,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Er1   0.00000   0.00000   0.00000   0.66670
S1   0.33333   0.66667   0.74500   1.00000
Cu1   0.33333   0.66667   0.36500   1.00000