The material described by MgSi crystallizes in the monoclinic P2_1/m 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 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 8-coordinate geometry to three equivalent Mg(1), three equivalent Mg(2), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_MgSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.869
_cell_length_b   4.388
_cell_length_c   6.166
_cell_angle_alpha   71.924
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   150.977
_cell_formula_units_Z   4
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  0.750  0.910  0.634  1.0
  Mg  Mg1  1  0.250  0.771  0.935  1.0
  Mg  Mg2  1  0.250  0.090  0.366  1.0
  Mg  Mg3  1  0.750  0.229  0.065  1.0
  Si  Si4  1  0.046  0.378  0.699  1.0
  Si  Si5  1  0.454  0.378  0.699  1.0
  Si  Si6  1  0.546  0.622  0.301  1.0
  Si  Si7  1  0.954  0.622  0.301  1.0
[/CIF]
.
The material described by MgSi crystallizes in the monoclinic P2_1/m 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 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 8-coordinate geometry to three equivalent Mg(1), three equivalent Mg(2), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_MgSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.869
_cell_length_b   4.388
_cell_length_c   6.166
_cell_angle_alpha   71.924
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   150.977
_cell_formula_units_Z   4
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  0.750  0.910  0.634  1.0
  Mg  Mg1  1  0.250  0.771  0.935  1.0
  Mg  Mg2  1  0.250  0.090  0.366  1.0
  Mg  Mg3  1  0.750  0.229  0.065  1.0
  Si  Si4  1  0.046  0.378  0.699  1.0
  Si  Si5  1  0.454  0.378  0.699  1.0
  Si  Si6  1  0.546  0.622  0.301  1.0
  Si  Si7  1  0.954  0.622  0.301  1.0
[/CIF]
.