data_global
_chemical_name_mineral 'Briartite'
loop_
_publ_author_name
'Wintenberger M'
_journal_name_full 'Materials Research Bulletin'
_journal_volume 14 
_journal_year 1979
_journal_page_first 1195
_journal_page_last 1202
_publ_section_title
;
 Etude de la structure cristallographique et magnetique de Cu2FeGeS4 et remarque
 sur la structure magnetique de Cu2MnSnS4
;
_database_code_amcsd 0014274
_chemical_formula_sum 'Cu2 Fe Ge S4'
_cell_length_a 5.325
_cell_length_b 5.325
_cell_length_c 10.51
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 298.018
_exptl_crystal_density_diffrn      4.277
_symmetry_space_group_name_H-M 'I -4 2 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '-y,-x,z'
  '1/2-y,1/2-x,1/2+z'
  'y,-x,-z'
  '1/2+y,1/2-x,1/2-z'
  '-x,y,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,z'
  '1/2-x,1/2-y,1/2+z'
  'y,x,z'
  '1/2+y,1/2+x,1/2+z'
  '-y,x,-z'
  '1/2-y,1/2+x,1/2-z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Cu   0.00000   0.50000   0.25000   0.01545
Fe   0.00000   0.00000   0.00000   0.01115
Ge   0.00000   0.00000   0.50000   0.00532
S   0.25900   0.25900  -0.12450   0.00925