The structure described by Mg3Si2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to three equivalent Mg(2), five equivalent Mg(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Mg3Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.348
_cell_length_b   5.348
_cell_length_c   6.870
_cell_angle_alpha   79.633
_cell_angle_beta   79.633
_cell_angle_gamma   86.124
_symmetry_Int_Tables_number   1
_cell_volume   190.040
_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
  Mg  Mg0  1  0.640  0.736  0.519  1.0
  Mg  Mg1  1  0.360  0.264  0.481  1.0
  Mg  Mg2  1  0.842  0.158  0.750  1.0
  Mg  Mg3  1  0.158  0.842  0.250  1.0
  Mg  Mg4  1  0.264  0.360  0.981  1.0
  Mg  Mg5  1  0.736  0.640  0.019  1.0
  Si  Si6  1  0.337  0.901  0.836  1.0
  Si  Si7  1  0.663  0.099  0.164  1.0
  Si  Si8  1  0.099  0.663  0.664  1.0
  Si  Si9  1  0.901  0.337  0.336  1.0
[/CIF]
.
The structure described by Mg3Si2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to five equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to three equivalent Mg(2), five equivalent Mg(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Mg3Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.348
_cell_length_b   5.348
_cell_length_c   6.870
_cell_angle_alpha   79.633
_cell_angle_beta   79.633
_cell_angle_gamma   86.124
_symmetry_Int_Tables_number   1
_cell_volume   190.040
_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
  Mg  Mg0  1  0.640  0.736  0.519  1.0
  Mg  Mg1  1  0.360  0.264  0.481  1.0
  Mg  Mg2  1  0.842  0.158  0.750  1.0
  Mg  Mg3  1  0.158  0.842  0.250  1.0
  Mg  Mg4  1  0.264  0.360  0.981  1.0
  Mg  Mg5  1  0.736  0.640  0.019  1.0
  Si  Si6  1  0.337  0.901  0.836  1.0
  Si  Si7  1  0.663  0.099  0.164  1.0
  Si  Si8  1  0.099  0.663  0.664  1.0
  Si  Si9  1  0.901  0.337  0.336  1.0
[/CIF]
.