The material described by Mg(SiO2)16 is Low Tridymite-derived structured and crystallizes in the monoclinic P2/m space group. The structure consists of one 7439-95-4 atom inside a SiO2 framework. In the SiO2 framework, there are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(3), one O(4), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(4), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(2), one O(5), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the second O site, O(10) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(4) atoms. In the eighth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the ninth O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the tenth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. is represented by the CIF file [CIF]
data_Mg(SiO2)16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.484
_cell_length_b   9.907
_cell_length_c   9.930
_cell_angle_alpha   89.942
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   834.661
_cell_formula_units_Z   1
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  0.000  0.000  0.500  1.0
  Si  Si1  1  0.313  0.170  0.120  1.0
  Si  Si2  1  0.187  0.379  0.330  1.0
  Si  Si3  1  0.313  0.330  0.621  1.0
  Si  Si4  1  0.313  0.830  0.880  1.0
  Si  Si5  1  0.187  0.621  0.670  1.0
  Si  Si6  1  0.813  0.121  0.830  1.0
  Si  Si7  1  0.687  0.330  0.621  1.0
  Si  Si8  1  0.187  0.121  0.830  1.0
  Si  Si9  1  0.813  0.879  0.170  1.0
  Si  Si10  1  0.813  0.621  0.670  1.0
  Si  Si11  1  0.687  0.830  0.880  1.0
  Si  Si12  1  0.813  0.379  0.330  1.0
  Si  Si13  1  0.313  0.670  0.379  1.0
  Si  Si14  1  0.687  0.670  0.379  1.0
  Si  Si15  1  0.187  0.879  0.170  1.0
  Si  Si16  1  0.687  0.170  0.120  1.0
  O  O17  1  0.500  0.650  0.353  1.0
  O  O18  1  0.218  0.041  0.182  1.0
  O  O19  1  0.251  0.307  0.194  1.0
  O  O20  1  0.782  0.459  0.682  1.0
  O  O21  1  0.000  0.851  0.151  1.0
  O  O22  1  0.500  0.150  0.147  1.0
  O  O23  1  0.719  0.683  0.541  1.0
  O  O24  1  0.719  0.183  0.959  1.0
  O  O25  1  0.782  0.541  0.318  1.0
  O  O26  1  0.218  0.959  0.818  1.0
  O  O27  1  0.000  0.149  0.849  1.0
  O  O28  1  0.500  0.350  0.647  1.0
  O  O29  1  0.281  0.183  0.959  1.0
  O  O30  1  0.218  0.541  0.318  1.0
  O  O31  1  0.500  0.850  0.853  1.0
  O  O32  1  0.252  0.194  0.694  1.0
  O  O33  1  0.000  0.352  0.348  1.0
  O  O34  1  0.748  0.806  0.306  1.0
  O  O35  1  0.218  0.459  0.682  1.0
  O  O36  1  0.251  0.693  0.806  1.0
  O  O37  1  0.000  0.648  0.652  1.0
  O  O38  1  0.749  0.307  0.194  1.0
  O  O39  1  0.749  0.693  0.806  1.0
  O  O40  1  0.281  0.817  0.041  1.0
  O  O41  1  0.281  0.317  0.459  1.0
  O  O42  1  0.719  0.317  0.459  1.0
  O  O43  1  0.252  0.806  0.306  1.0
  O  O44  1  0.748  0.194  0.694  1.0
  O  O45  1  0.782  0.959  0.818  1.0
  O  O46  1  0.281  0.683  0.541  1.0
  O  O47  1  0.719  0.817  0.041  1.0
  O  O48  1  0.782  0.041  0.182  1.0
[/CIF]
.
The material described by Mg(SiO2)16 is Low Tridymite-derived structured and crystallizes in the monoclinic P2/m space group. The structure consists of one 7439-95-4 atom inside a SiO2 framework. In the SiO2 framework, there are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(3), one O(4), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(4), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(2), one O(5), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the second O site, O(10) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(4) atoms. In the eighth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the ninth O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the tenth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. is represented by the CIF file [CIF]
data_Mg(SiO2)16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.484
_cell_length_b   9.907
_cell_length_c   9.930
_cell_angle_alpha   89.942
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   834.661
_cell_formula_units_Z   1
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  0.000  0.000  0.500  1.0
  Si  Si1  1  0.313  0.170  0.120  1.0
  Si  Si2  1  0.187  0.379  0.330  1.0
  Si  Si3  1  0.313  0.330  0.621  1.0
  Si  Si4  1  0.313  0.830  0.880  1.0
  Si  Si5  1  0.187  0.621  0.670  1.0
  Si  Si6  1  0.813  0.121  0.830  1.0
  Si  Si7  1  0.687  0.330  0.621  1.0
  Si  Si8  1  0.187  0.121  0.830  1.0
  Si  Si9  1  0.813  0.879  0.170  1.0
  Si  Si10  1  0.813  0.621  0.670  1.0
  Si  Si11  1  0.687  0.830  0.880  1.0
  Si  Si12  1  0.813  0.379  0.330  1.0
  Si  Si13  1  0.313  0.670  0.379  1.0
  Si  Si14  1  0.687  0.670  0.379  1.0
  Si  Si15  1  0.187  0.879  0.170  1.0
  Si  Si16  1  0.687  0.170  0.120  1.0
  O  O17  1  0.500  0.650  0.353  1.0
  O  O18  1  0.218  0.041  0.182  1.0
  O  O19  1  0.251  0.307  0.194  1.0
  O  O20  1  0.782  0.459  0.682  1.0
  O  O21  1  0.000  0.851  0.151  1.0
  O  O22  1  0.500  0.150  0.147  1.0
  O  O23  1  0.719  0.683  0.541  1.0
  O  O24  1  0.719  0.183  0.959  1.0
  O  O25  1  0.782  0.541  0.318  1.0
  O  O26  1  0.218  0.959  0.818  1.0
  O  O27  1  0.000  0.149  0.849  1.0
  O  O28  1  0.500  0.350  0.647  1.0
  O  O29  1  0.281  0.183  0.959  1.0
  O  O30  1  0.218  0.541  0.318  1.0
  O  O31  1  0.500  0.850  0.853  1.0
  O  O32  1  0.252  0.194  0.694  1.0
  O  O33  1  0.000  0.352  0.348  1.0
  O  O34  1  0.748  0.806  0.306  1.0
  O  O35  1  0.218  0.459  0.682  1.0
  O  O36  1  0.251  0.693  0.806  1.0
  O  O37  1  0.000  0.648  0.652  1.0
  O  O38  1  0.749  0.307  0.194  1.0
  O  O39  1  0.749  0.693  0.806  1.0
  O  O40  1  0.281  0.817  0.041  1.0
  O  O41  1  0.281  0.317  0.459  1.0
  O  O42  1  0.719  0.317  0.459  1.0
  O  O43  1  0.252  0.806  0.306  1.0
  O  O44  1  0.748  0.194  0.694  1.0
  O  O45  1  0.782  0.959  0.818  1.0
  O  O46  1  0.281  0.683  0.541  1.0
  O  O47  1  0.719  0.817  0.041  1.0
  O  O48  1  0.782  0.041  0.182  1.0
[/CIF]
.