data_[Ca4Mg4Cu4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Mg  1.3100  1.5000  0.8600
  Cu  1.9000  1.3500  0.8200
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [12.4716]
_cell_length_b [4.1827]
_cell_length_c [5.5229]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.3186]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [CaMgCu]
_chemical_formula_sum '[Ca4 Mg4 Cu4]'
_cell_volume [282.5020]
_cell_formula_units_Z [4]
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
[
  Ca  Ca0  4  0.1327  0.0000  0.3201  1.0
  Mg  Mg1  4  0.0855  0.5000  0.7859  1.0
  Cu  Cu2  4  0.2273  0.0000  0.8731  1.0
]