data_global
_chemical_name_mineral 'Silver'
loop_
_publ_author_name
'Novgorodova M I'
'Gorshkov A I'
'Mokhov A V'
_journal_name_full 'International Geology Review'
_journal_volume 23 
_journal_year 1981
_journal_page_first 485
_journal_page_last 494
_publ_section_title
;
 Native silver and its new structural modifications
 Note: sample DV-300, known as silver 4H
;
_database_code_amcsd 0018575
_chemical_compound_source 'northeast USSR'
_chemical_formula_sum 'Ag.985 Cu.005'
_cell_length_a 2.88
_cell_length_b 2.88
_cell_length_c 9.62
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 69.102
_exptl_crystal_density_diffrn      5.124
_symmetry_space_group_name_H-M 'P 63/m m c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x,x-y,1/2-z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  '-y,-x,z'
  'y,x,-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x+y,y,1/2-z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x,x-y,z'
  '-x,-x+y,-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x+y,y,z'
  'x-y,-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Ag   0.33333   0.66667   0.25000   0.98550
Cu   0.33333   0.66667   0.25000   0.00460
Fe   0.33333   0.66667   0.25000   0.00010
Cr   0.33333   0.66667   0.25000   0.00010
Ni   0.33333   0.66667   0.25000   0.00010