The material described by Na2MgSiO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NaO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Mg(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2MgSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   6.993
_cell_length_c   10.905
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   400.351
_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
  Na  Na0  1  0.263  0.130  0.588  1.0
  Na  Na1  1  0.291  0.385  0.842  1.0
  Na  Na2  1  0.791  0.885  0.658  1.0
  Na  Na3  1  0.209  0.385  0.342  1.0
  Na  Na4  1  0.737  0.630  0.412  1.0
  Na  Na5  1  0.237  0.130  0.088  1.0
  Na  Na6  1  0.763  0.630  0.912  1.0
  Na  Na7  1  0.709  0.885  0.158  1.0
  Mg  Mg8  1  0.198  0.880  0.342  1.0
  Mg  Mg9  1  0.302  0.880  0.842  1.0
  Mg  Mg10  1  0.802  0.380  0.658  1.0
  Mg  Mg11  1  0.698  0.380  0.158  1.0
  Si  Si12  1  0.695  0.132  0.406  1.0
  Si  Si13  1  0.305  0.632  0.594  1.0
  Si  Si14  1  0.805  0.132  0.906  1.0
  Si  Si15  1  0.195  0.632  0.094  1.0
  O  O16  1  0.387  0.104  0.389  1.0
  O  O17  1  0.613  0.604  0.611  1.0
  O  O18  1  0.113  0.104  0.889  1.0
  O  O19  1  0.887  0.604  0.111  1.0
  O  O20  1  0.754  0.160  0.553  1.0
  O  O21  1  0.246  0.660  0.447  1.0
  O  O22  1  0.746  0.160  0.053  1.0
  O  O23  1  0.254  0.660  0.947  1.0
  O  O24  1  0.837  0.941  0.355  1.0
  O  O25  1  0.163  0.441  0.645  1.0
  O  O26  1  0.663  0.941  0.855  1.0
  O  O27  1  0.279  0.824  0.171  1.0
  O  O28  1  0.779  0.324  0.329  1.0
  O  O29  1  0.221  0.824  0.671  1.0
  O  O30  1  0.721  0.324  0.829  1.0
  O  O31  1  0.337  0.441  0.145  1.0
[/CIF]
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The material described by Na2MgSiO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NaO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Mg(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2MgSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   6.993
_cell_length_c   10.905
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   400.351
_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
  Na  Na0  1  0.263  0.130  0.588  1.0
  Na  Na1  1  0.291  0.385  0.842  1.0
  Na  Na2  1  0.791  0.885  0.658  1.0
  Na  Na3  1  0.209  0.385  0.342  1.0
  Na  Na4  1  0.737  0.630  0.412  1.0
  Na  Na5  1  0.237  0.130  0.088  1.0
  Na  Na6  1  0.763  0.630  0.912  1.0
  Na  Na7  1  0.709  0.885  0.158  1.0
  Mg  Mg8  1  0.198  0.880  0.342  1.0
  Mg  Mg9  1  0.302  0.880  0.842  1.0
  Mg  Mg10  1  0.802  0.380  0.658  1.0
  Mg  Mg11  1  0.698  0.380  0.158  1.0
  Si  Si12  1  0.695  0.132  0.406  1.0
  Si  Si13  1  0.305  0.632  0.594  1.0
  Si  Si14  1  0.805  0.132  0.906  1.0
  Si  Si15  1  0.195  0.632  0.094  1.0
  O  O16  1  0.387  0.104  0.389  1.0
  O  O17  1  0.613  0.604  0.611  1.0
  O  O18  1  0.113  0.104  0.889  1.0
  O  O19  1  0.887  0.604  0.111  1.0
  O  O20  1  0.754  0.160  0.553  1.0
  O  O21  1  0.246  0.660  0.447  1.0
  O  O22  1  0.746  0.160  0.053  1.0
  O  O23  1  0.254  0.660  0.947  1.0
  O  O24  1  0.837  0.941  0.355  1.0
  O  O25  1  0.163  0.441  0.645  1.0
  O  O26  1  0.663  0.941  0.855  1.0
  O  O27  1  0.279  0.824  0.171  1.0
  O  O28  1  0.779  0.324  0.329  1.0
  O  O29  1  0.221  0.824  0.671  1.0
  O  O30  1  0.721  0.324  0.829  1.0
  O  O31  1  0.337  0.441  0.145  1.0
[/CIF]
.