data_global
_chemical_name_mineral 'Tetradymite'
loop_
_publ_author_name
'Lange P W'
_journal_name_full 'Naturwissenschaften'
_journal_volume 27 
_journal_year 1939
_journal_page_first 133
_journal_page_last 134
_publ_section_title
;
 Ein Vergleich zwischen Bi2Te3 und Bi2Te2S
;
_database_code_amcsd 0014689
_chemical_formula_sum 'Bi2 Te2 S'
_cell_length_a 10.31
_cell_length_b 10.31
_cell_length_c 10.31
_cell_angle_alpha 24.17
_cell_angle_beta 24.17
_cell_angle_gamma 24.17
_cell_volume 161.468
_exptl_crystal_density_diffrn      7.253
_symmetry_space_group_name_H-M 'R -3 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-z,-y'
  '-z,-x,-y'
  'y,x,z'
  'y,z,x'
  '-z,-y,-x'
  '-x,-y,-z'
  'x,z,y'
  'z,x,y'
  '-y,-x,-z'
  '-y,-z,-x'
  'z,y,x'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Bi   0.39200   0.39200   0.39200
Te   0.78800   0.78800   0.78800
S   0.00000   0.00000   0.00000