The material structure described by Mg2SiO4 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Mg(2) and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), two equivalent Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Mg(2), two equivalent Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Mg(2), and one Si(1) atom to form distorted corner-sharing OMg3Si trigonal pyramids. is represented by the CIF file [CIF]
data_Mg2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.482
_cell_length_b   7.392
_cell_length_c   7.549
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.896
_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  0.407  0.744  0.142  1.0
  Mg  Mg1  1  0.907  0.756  0.858  1.0
  Mg  Mg2  1  0.717  0.437  0.041  1.0
  Mg  Mg3  1  0.783  0.563  0.541  1.0
  Mg  Mg4  1  0.217  0.063  0.959  1.0
  Mg  Mg5  1  0.283  0.937  0.459  1.0
  Mg  Mg6  1  0.093  0.256  0.642  1.0
  Mg  Mg7  1  0.593  0.244  0.358  1.0
  Si  Si8  1  0.630  0.144  0.765  1.0
  Si  Si9  1  0.370  0.644  0.735  1.0
  Si  Si10  1  0.130  0.356  0.235  1.0
  Si  Si11  1  0.870  0.856  0.265  1.0
  O  O12  1  0.454  0.713  0.540  1.0
  O  O13  1  0.376  0.487  0.212  1.0
  O  O14  1  0.954  0.787  0.460  1.0
  O  O15  1  0.775  0.718  0.106  1.0
  O  O16  1  0.876  0.013  0.788  1.0
  O  O17  1  0.046  0.287  0.040  1.0
  O  O18  1  0.140  0.927  0.192  1.0
  O  O19  1  0.360  0.073  0.692  1.0
  O  O20  1  0.275  0.782  0.894  1.0
  O  O21  1  0.546  0.213  0.960  1.0
  O  O22  1  0.725  0.282  0.606  1.0
  O  O23  1  0.640  0.573  0.808  1.0
  O  O24  1  0.860  0.427  0.308  1.0
  O  O25  1  0.124  0.513  0.712  1.0
  O  O26  1  0.225  0.218  0.394  1.0
  O  O27  1  0.624  0.987  0.288  1.0
[/CIF]
.
The material structure described by Mg2SiO4 crystallizes in the orthorhombic P2_12_12_1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to two equivalent Mg(2) and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), two equivalent Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Mg(2), two equivalent Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Mg(2), and one Si(1) atom to form distorted corner-sharing OMg3Si trigonal pyramids. is represented by the CIF file [CIF]
data_Mg2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.482
_cell_length_b   7.392
_cell_length_c   7.549
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   305.896
_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  0.407  0.744  0.142  1.0
  Mg  Mg1  1  0.907  0.756  0.858  1.0
  Mg  Mg2  1  0.717  0.437  0.041  1.0
  Mg  Mg3  1  0.783  0.563  0.541  1.0
  Mg  Mg4  1  0.217  0.063  0.959  1.0
  Mg  Mg5  1  0.283  0.937  0.459  1.0
  Mg  Mg6  1  0.093  0.256  0.642  1.0
  Mg  Mg7  1  0.593  0.244  0.358  1.0
  Si  Si8  1  0.630  0.144  0.765  1.0
  Si  Si9  1  0.370  0.644  0.735  1.0
  Si  Si10  1  0.130  0.356  0.235  1.0
  Si  Si11  1  0.870  0.856  0.265  1.0
  O  O12  1  0.454  0.713  0.540  1.0
  O  O13  1  0.376  0.487  0.212  1.0
  O  O14  1  0.954  0.787  0.460  1.0
  O  O15  1  0.775  0.718  0.106  1.0
  O  O16  1  0.876  0.013  0.788  1.0
  O  O17  1  0.046  0.287  0.040  1.0
  O  O18  1  0.140  0.927  0.192  1.0
  O  O19  1  0.360  0.073  0.692  1.0
  O  O20  1  0.275  0.782  0.894  1.0
  O  O21  1  0.546  0.213  0.960  1.0
  O  O22  1  0.725  0.282  0.606  1.0
  O  O23  1  0.640  0.573  0.808  1.0
  O  O24  1  0.860  0.427  0.308  1.0
  O  O25  1  0.124  0.513  0.712  1.0
  O  O26  1  0.225  0.218  0.394  1.0
  O  O27  1  0.624  0.987  0.288  1.0
[/CIF]
.