data_[Ca4Ac2Mg2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Ac  1.1000  1.9500  1.2600
  Mg  1.3100  1.5000  0.8600
]
_symmetry_space_group_name_H-M [P4/nmm]
_cell_length_a [5.7797]
_cell_length_b [5.7797]
_cell_length_c [9.1565]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [129]
_chemical_formula_structural [Ca2AcMg]
_chemical_formula_sum '[Ca4 Ac2 Mg2]'
_cell_volume [305.8730]
_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
[
  Ca  Ca0  2  0.0000  0.0000  0.5000  1
  Ca  Ca1  2  0.0000  0.5000  0.7878  1
  Ac  Ac2  2  0.0000  0.5000  0.2101  1
  Mg  Mg3  2  0.0000  0.0000  0.0000  1
]