The structure described by MgSi2 crystallizes in the orthorhombic Imma space group. Mg(1) is bonded in a 10-coordinate geometry to ten equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to five equivalent Mg(1) and four equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.466
_cell_length_b   5.466
_cell_length_c   5.466
_cell_angle_alpha   136.798
_cell_angle_beta   107.532
_cell_angle_gamma   88.271
_symmetry_Int_Tables_number   1
_cell_volume   102.025
_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  0.829  0.579  0.250  1.0
  Mg  Mg1  1  0.171  0.421  0.750  1.0
  Si  Si2  1  0.211  0.150  0.061  1.0
  Si  Si3  1  0.789  0.850  0.939  1.0
  Si  Si4  1  0.589  0.150  0.439  1.0
  Si  Si5  1  0.411  0.850  0.561  1.0
[/CIF]
.
The structure described by MgSi2 crystallizes in the orthorhombic Imma space group. Mg(1) is bonded in a 10-coordinate geometry to ten equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to five equivalent Mg(1) and four equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.466
_cell_length_b   5.466
_cell_length_c   5.466
_cell_angle_alpha   136.798
_cell_angle_beta   107.532
_cell_angle_gamma   88.271
_symmetry_Int_Tables_number   1
_cell_volume   102.025
_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  0.829  0.579  0.250  1.0
  Mg  Mg1  1  0.171  0.421  0.750  1.0
  Si  Si2  1  0.211  0.150  0.061  1.0
  Si  Si3  1  0.789  0.850  0.939  1.0
  Si  Si4  1  0.589  0.150  0.439  1.0
  Si  Si5  1  0.411  0.850  0.561  1.0
[/CIF]
.