The material structure described by Mg4Si3 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 5-coordinate geometry to one Si(1) and four equivalent Si(2) atoms. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent Mg(1) and four equivalent Mg(2) atoms to form distorted edge-sharing SiMg6 octahedra. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg4Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.362
_cell_length_b   5.533
_cell_length_c   6.477
_cell_angle_alpha   78.952
_cell_angle_beta   71.881
_cell_angle_gamma   68.206
_symmetry_Int_Tables_number   1
_cell_volume   137.432
_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  0.610  0.713  0.098  1.0
  Mg  Mg1  1  0.172  0.202  0.444  1.0
  Mg  Mg2  1  0.828  0.798  0.556  1.0
  Mg  Mg3  1  0.390  0.287  0.902  1.0
  Si  Si4  1  0.500  0.500  0.500  1.0
  Si  Si5  1  0.832  0.140  0.168  1.0
  Si  Si6  1  0.168  0.860  0.832  1.0
[/CIF]
.
The material structure described by Mg4Si3 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 5-coordinate geometry to one Si(1) and four equivalent Si(2) atoms. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent Mg(1) and four equivalent Mg(2) atoms to form distorted edge-sharing SiMg6 octahedra. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg4Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.362
_cell_length_b   5.533
_cell_length_c   6.477
_cell_angle_alpha   78.952
_cell_angle_beta   71.881
_cell_angle_gamma   68.206
_symmetry_Int_Tables_number   1
_cell_volume   137.432
_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  0.610  0.713  0.098  1.0
  Mg  Mg1  1  0.172  0.202  0.444  1.0
  Mg  Mg2  1  0.828  0.798  0.556  1.0
  Mg  Mg3  1  0.390  0.287  0.902  1.0
  Si  Si4  1  0.500  0.500  0.500  1.0
  Si  Si5  1  0.832  0.140  0.168  1.0
  Si  Si6  1  0.168  0.860  0.832  1.0
[/CIF]
.