data_Na2SrMg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.43
_cell_length_b   6.43
_cell_length_c   6.43
_cell_angle_alpha   134.22
_cell_angle_beta   128.41
_cell_angle_gamma   71.41
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2SrMg
_chemical_formula_sum   'Na2 Sr1 Mg1'
_cell_volume   145.87
_cell_formula_units_Z   1
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
  Na  Na1  1  0.0  0.8  0.17  1.0
  Na  Na2  1  0.0  0.0  0.52  1.0
  Sr  Sr3  1  0.0  0.8  0.01  1.0
  Mg  Mg0  1  0.0  0.0  0.95  1.0

data_Na2SrMg
_symmetry_space_group_name_H-M   P1
_cell_length_a   5.0
_cell_length_b   5.59
_cell_length_c   6.43
_cell_angle_alpha   115.8
_cell_angle_beta   112.89
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2SrMg
_chemical_formula_sum   'Na2 Sr1 Mg1'
_cell_volume   145.87
_cell_formula_units_Z   1
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
  Na  Na0  1  0.48  0.48  0.48  1.0
  Na  Na1  1  0.83  0.62  0.62  1.0
  Sr  Sr2  1  0.99  0.79  0.79  1.0
  Mg  Mg3  1  0.05  0.05  0.05  1.0

Na Na Sr Mg