data_[Cu4As4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  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 [C2/m]
_cell_length_a [7.5071]
_cell_length_b [8.3540]
_cell_length_c [5.0197]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.8179]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Cu2As2O7]
_chemical_formula_sum '[Cu4 As4 O14]'
_cell_volume [290.1731]
_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
[
  Cu  Cu0  4  0.0000  0.3142  0.5000  1.0
  As  As1  4  0.2014  0.0000  0.9054  1.0
  O  O2  8  0.2032  0.1687  0.7167  1.0
  O  O3  4  0.1006  0.5000  0.7663  1.0
  O  O4  2  0.0000  0.0000  0.0000  1.0
]