The material structure described by Mg3Si2 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Mg(2), six 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   4.280
_cell_length_b   5.240
_cell_length_c   5.373
_cell_angle_alpha   97.740
_cell_angle_beta   111.482
_cell_angle_gamma   113.387
_symmetry_Int_Tables_number   1
_cell_volume   97.225
_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  0.002  0.294  0.707  1.0
  Mg  Mg1  1  0.998  0.706  0.293  1.0
  Mg  Mg2  1  0.500  0.000  0.000  1.0
  Si  Si3  1  0.721  0.706  0.710  1.0
  Si  Si4  1  0.279  0.294  0.290  1.0
[/CIF]
.
The material structure described by Mg3Si2 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Mg(2), six 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   4.280
_cell_length_b   5.240
_cell_length_c   5.373
_cell_angle_alpha   97.740
_cell_angle_beta   111.482
_cell_angle_gamma   113.387
_symmetry_Int_Tables_number   1
_cell_volume   97.225
_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  0.002  0.294  0.707  1.0
  Mg  Mg1  1  0.998  0.706  0.293  1.0
  Mg  Mg2  1  0.500  0.000  0.000  1.0
  Si  Si3  1  0.721  0.706  0.710  1.0
  Si  Si4  1  0.279  0.294  0.290  1.0
[/CIF]
.