The structure described by MgSiO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(1) atoms to form distorted MgO6 octahedra that share corners with nine equivalent Si(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, and  a faceface with one Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-60°. Si(1) is bonded to six equivalent O(1) atoms to form SiO6 octahedra that share corners with nine equivalent Mg(1)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-60°. O(1) is bonded in a distorted see-saw-like geometry to two equivalent Mg(1) and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_MgSiO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.346
_cell_length_b   5.346
_cell_length_c   5.346
_cell_angle_alpha   53.190
_cell_angle_beta   53.190
_cell_angle_gamma   53.190
_symmetry_Int_Tables_number   1
_cell_volume   90.811
_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  0.360  0.360  0.360  1.0
  Mg  Mg1  1  0.640  0.640  0.640  1.0
  Si  Si2  1  0.158  0.158  0.158  1.0
  Si  Si3  1  0.842  0.842  0.842  1.0
  O  O4  1  0.797  0.045  0.438  1.0
  O  O5  1  0.438  0.797  0.045  1.0
  O  O6  1  0.045  0.438  0.797  1.0
  O  O7  1  0.203  0.955  0.562  1.0
  O  O8  1  0.955  0.562  0.203  1.0
  O  O9  1  0.562  0.203  0.955  1.0
[/CIF]
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The structure described by MgSiO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(1) atoms to form distorted MgO6 octahedra that share corners with nine equivalent Si(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, and  a faceface with one Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-60°. Si(1) is bonded to six equivalent O(1) atoms to form SiO6 octahedra that share corners with nine equivalent Mg(1)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-60°. O(1) is bonded in a distorted see-saw-like geometry to two equivalent Mg(1) and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_MgSiO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.346
_cell_length_b   5.346
_cell_length_c   5.346
_cell_angle_alpha   53.190
_cell_angle_beta   53.190
_cell_angle_gamma   53.190
_symmetry_Int_Tables_number   1
_cell_volume   90.811
_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  0.360  0.360  0.360  1.0
  Mg  Mg1  1  0.640  0.640  0.640  1.0
  Si  Si2  1  0.158  0.158  0.158  1.0
  Si  Si3  1  0.842  0.842  0.842  1.0
  O  O4  1  0.797  0.045  0.438  1.0
  O  O5  1  0.438  0.797  0.045  1.0
  O  O6  1  0.045  0.438  0.797  1.0
  O  O7  1  0.203  0.955  0.562  1.0
  O  O8  1  0.955  0.562  0.203  1.0
  O  O9  1  0.562  0.203  0.955  1.0
[/CIF]
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