The structure described by MgLaSe3 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form distorted edge-sharing MgSe6 octahedra. La(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one La(1) atom. In the second Se site, Se(2) is bonded to two equivalent Mg(1) and two equivalent La(1) atoms to form edge-sharing SeLa2Mg2 tetrahedra. is represented by the CIF card [CIF]
data_LaMgSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.366
_cell_length_b   7.366
_cell_length_c   6.818
_cell_angle_alpha   76.795
_cell_angle_beta   76.795
_cell_angle_gamma   113.956
_symmetry_Int_Tables_number   1
_cell_volume   306.939
_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
  La  La0  1  0.195  0.195  0.693  1.0
  La  La1  1  0.805  0.805  0.307  1.0
  Mg  Mg2  1  0.334  0.666  0.000  1.0
  Mg  Mg3  1  0.666  0.334  0.000  1.0
  Se  Se4  1  0.097  0.755  0.791  1.0
  Se  Se5  1  0.903  0.245  0.209  1.0
  Se  Se6  1  0.245  0.903  0.209  1.0
  Se  Se7  1  0.755  0.097  0.791  1.0
  Se  Se8  1  0.467  0.467  0.256  1.0
  Se  Se9  1  0.533  0.533  0.744  1.0
[/CIF]
.
The structure described by MgLaSe3 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form distorted edge-sharing MgSe6 octahedra. La(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one La(1) atom. In the second Se site, Se(2) is bonded to two equivalent Mg(1) and two equivalent La(1) atoms to form edge-sharing SeLa2Mg2 tetrahedra. is represented by the CIF card [CIF]
data_LaMgSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.366
_cell_length_b   7.366
_cell_length_c   6.818
_cell_angle_alpha   76.795
_cell_angle_beta   76.795
_cell_angle_gamma   113.956
_symmetry_Int_Tables_number   1
_cell_volume   306.939
_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
  La  La0  1  0.195  0.195  0.693  1.0
  La  La1  1  0.805  0.805  0.307  1.0
  Mg  Mg2  1  0.334  0.666  0.000  1.0
  Mg  Mg3  1  0.666  0.334  0.000  1.0
  Se  Se4  1  0.097  0.755  0.791  1.0
  Se  Se5  1  0.903  0.245  0.209  1.0
  Se  Se6  1  0.245  0.903  0.209  1.0
  Se  Se7  1  0.755  0.097  0.791  1.0
  Se  Se8  1  0.467  0.467  0.256  1.0
  Se  Se9  1  0.533  0.533  0.744  1.0
[/CIF]
.