The compound described by MgSi2 is Magnesium tetraboride-like structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent Si(1) and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to four equivalent Mg(1) and three equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Mg(1), one Si(2), and three equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_MgSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.290
_cell_length_b   5.290
_cell_length_c   6.286
_cell_angle_alpha   63.975
_cell_angle_beta   63.975
_cell_angle_gamma   44.248
_symmetry_Int_Tables_number   1
_cell_volume   108.097
_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  0.149  0.149  0.714  1.0
  Mg  Mg1  1  0.851  0.851  0.286  1.0
  Si  Si2  1  0.854  0.854  0.720  1.0
  Si  Si3  1  0.595  0.595  0.088  1.0
  Si  Si4  1  0.405  0.405  0.912  1.0
  Si  Si5  1  0.146  0.146  0.280  1.0
[/CIF]
.
The compound described by MgSi2 is Magnesium tetraboride-like structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent Si(1) and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to four equivalent Mg(1) and three equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Mg(1), one Si(2), and three equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_MgSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.290
_cell_length_b   5.290
_cell_length_c   6.286
_cell_angle_alpha   63.975
_cell_angle_beta   63.975
_cell_angle_gamma   44.248
_symmetry_Int_Tables_number   1
_cell_volume   108.097
_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  0.149  0.149  0.714  1.0
  Mg  Mg1  1  0.851  0.851  0.286  1.0
  Si  Si2  1  0.854  0.854  0.720  1.0
  Si  Si3  1  0.595  0.595  0.088  1.0
  Si  Si4  1  0.405  0.405  0.912  1.0
  Si  Si5  1  0.146  0.146  0.280  1.0
[/CIF]
.