data_Mg2TeSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.91
_cell_length_b   3.91
_cell_length_c   7.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   118.08
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2TeSe
_chemical_formula_sum   'Mg2 Te1 Se1'
_cell_volume   102.73
_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  0.01  0.0  0.85  1.0
  Mg  Mg1  1  0.01  0.0  0.76  1.0
  Te  Te3  1  0.0  0.0  0.81  1.0
  Se  Se2  1  0.0  0.0  0.0  1.0

data_Mg2TeSe
_symmetry_space_group_name_H-M   Cmm2
_cell_length_a   4.02
_cell_length_b   6.71
_cell_length_c   7.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   35
_chemical_formula_structural   Mg2TeSe
_chemical_formula_sum   'Mg4 Te2 Se2'
_cell_volume   205.46
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, z'
  3  '-x, y, z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, z'
  7  '-x+1/2, y+1/2, z'
  8  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.15  1.0
  Mg  Mg1  2  0.0  0.0  0.24  1.0
  Te  Te2  2  0.0  0.0  0.19  1.0
  Se  Se3  2  0.0  0.0  0.0  1.0

Mg Mg Te Se