data_Mg2TaAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.02
_cell_length_b   3.02
_cell_length_c   9.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   106.58
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2TaAs
_chemical_formula_sum   'Mg2 Ta1 As1'
_cell_volume   79.79
_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
  Mg  Mg1  1  0.81  0.0  0.12  1.0
  Mg  Mg2  1  0.0  0.0  0.68  1.0
  Ta  Ta3  1  0.81  0.0  0.36  1.0
  As  As0  1  0.0  0.0  0.49  1.0

data_Mg2TaAs
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.02
_cell_length_b   3.02
_cell_length_c   9.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   106.58
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2TaAs
_chemical_formula_sum   'Mg2 Ta1 As1'
_cell_volume   79.79
_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
  Mg  Mg0  1  0.0  0.0  0.68  1.0
  Mg  Mg1  1  0.81  0.0  0.12  1.0
  Ta  Ta2  1  0.81  0.0  0.36  1.0
  As  As3  1  0.0  0.0  0.49  1.0

Mg Mg Ta As
Mg Mg Ta As 0 2 o o o 1 3 o o o 2 3 + o o 