data_[Fe4Cu2As4O28]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Fe  1.8300  1.4000  0.8525
  Cu  1.9000  1.3500  0.8200
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [10.0414]
_cell_length_b [9.4221]
_cell_length_c [5.6301]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.0306]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Fe2Cu(AsO7)2]
_chemical_formula_sum '[Fe4 Cu2 As4 O28]'
_cell_volume [532.5802]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Fe  Fe0  4  0.4502  0.6423  0.8472  1
  Cu  Cu1  2  0.0000  0.0000  0.0000  1
  As  As2  4  0.2979  0.5657  0.3633  1
  O  O3  4  0.0222  0.7347  0.6170  1
  O  O4  4  0.0767  0.1959  0.3274  1
  O  O5  4  0.1436  0.0097  0.8085  1
  O  O6  4  0.2815  0.7470  0.3441  1
  O  O7  4  0.3560  0.5091  0.6366  1
  O  O8  4  0.3924  0.5038  0.1272  1
  O  O9  4  0.4776  0.2379  0.9280  1
]