The structure described by Mg2Si3 is Magnesium tetraboride-like structured and 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 9-coordinate geometry to one Mg(1), one Mg(2), one Si(1), two equivalent Si(2), and four equivalent Si(3) atoms. In the second Mg site, Mg(2) is bonded in a 7-coordinate geometry to one Mg(1), two equivalent Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Mg(1), three equivalent Mg(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), one Si(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_Mg2Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.822
_cell_length_b   5.883
_cell_length_c   7.302
_cell_angle_alpha   97.871
_cell_angle_beta   102.371
_cell_angle_gamma   107.588
_symmetry_Int_Tables_number   1
_cell_volume   188.311
_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  0.193  0.810  0.896  1.0
  Mg  Mg1  1  0.807  0.190  0.104  1.0
  Mg  Mg2  1  0.677  0.241  0.687  1.0
  Mg  Mg3  1  0.323  0.759  0.313  1.0
  Si  Si4  1  0.196  0.417  0.562  1.0
  Si  Si5  1  0.804  0.583  0.438  1.0
  Si  Si6  1  0.640  0.777  0.693  1.0
  Si  Si7  1  0.360  0.223  0.307  1.0
  Si  Si8  1  0.282  0.314  0.915  1.0
  Si  Si9  1  0.718  0.686  0.085  1.0
[/CIF]
.
The structure described by Mg2Si3 is Magnesium tetraboride-like structured and 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 9-coordinate geometry to one Mg(1), one Mg(2), one Si(1), two equivalent Si(2), and four equivalent Si(3) atoms. In the second Mg site, Mg(2) is bonded in a 7-coordinate geometry to one Mg(1), two equivalent Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Mg(1), three equivalent Mg(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), one Si(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_Mg2Si3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.822
_cell_length_b   5.883
_cell_length_c   7.302
_cell_angle_alpha   97.871
_cell_angle_beta   102.371
_cell_angle_gamma   107.588
_symmetry_Int_Tables_number   1
_cell_volume   188.311
_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  0.193  0.810  0.896  1.0
  Mg  Mg1  1  0.807  0.190  0.104  1.0
  Mg  Mg2  1  0.677  0.241  0.687  1.0
  Mg  Mg3  1  0.323  0.759  0.313  1.0
  Si  Si4  1  0.196  0.417  0.562  1.0
  Si  Si5  1  0.804  0.583  0.438  1.0
  Si  Si6  1  0.640  0.777  0.693  1.0
  Si  Si7  1  0.360  0.223  0.307  1.0
  Si  Si8  1  0.282  0.314  0.915  1.0
  Si  Si9  1  0.718  0.686  0.085  1.0
[/CIF]
.