data_global
_chemical_name_mineral 'Bradaczekite'
loop_
_publ_author_name
'Krivovichev S V'
'Filatov S K'
'Burns P C'
_journal_name_full 'Zapiski Vserossijskogo Mineralogicheskogo Obshchestva'
_journal_volume 2001 
_journal_year 2001
_journal_page_first 1
_journal_page_last 8
_publ_section_title
;
 The Jahn-Teller distortion of copper coordination polyhedra in the alluaudite
 structural type: Crystal structure of bradaczekite, NaCu4(AsO4)3
;
_database_code_amcsd 0015718
_chemical_formula_sum 'Na Cu4 As3 O12'
_cell_length_a 12.053
_cell_length_b 12.432
_cell_length_c 7.2529
_cell_angle_alpha 90
_cell_angle_beta 117.793
_cell_angle_gamma 90
_cell_volume 961.421
_exptl_crystal_density_diffrn      4.794
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-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_U_iso_or_equiv
Na   0.00000   0.49240   0.25000   0.02090
Cu1   0.00000   0.00439   0.25000   0.00990
Cu2   0.78021   0.34367   0.86019   0.01080
Cu3   0.00000   0.76511   0.25000   0.01400
As1   0.22752   0.38288   0.12152   0.00710
As2   0.00000   0.22278   0.25000   0.00760
O1   0.16720   0.50530   0.11800   0.01280
O2   0.89700   0.12300   0.24180   0.01070
O3   0.38190   0.38930   0.17630   0.01360
O4   0.22120   0.30750   0.30800   0.01060
O5   0.14560   0.33280   0.87860   0.01080
O6  -0.04300   0.29710   0.03650   0.01440