data_[Li4Cu2As2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Li  0.9800  1.4500  0.9000
  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]
_cell_length_a [6.0286]
_cell_length_b [5.1743]
_cell_length_c [6.3256]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.1131]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [4]
_chemical_formula_structural [Li2CuAsO4]
_chemical_formula_sum '[Li4 Cu2 As2 O8]'
_cell_volume [197.2856]
_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
[
  Li  Li0  2  0.0389  0.0240  0.8270  1.0
  Li  Li1  2  0.2094  0.5316  0.5392  1.0
  Cu  Cu2  2  0.3825  0.4091  0.9990  1.0
  As  As3  2  0.2590  0.0136  0.2970  1.0
  O  O4  2  0.0971  0.8705  0.1043  1.0
  O  O5  2  0.1494  0.9241  0.5335  1.0
  O  O6  2  0.2535  0.3513  0.2641  1.0
  O  O7  2  0.4629  0.4219  0.7168  1.0
]