The crystal structure described by Na4Mg(WO4)2 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with three equivalent W(1)O4 tetrahedra, and edges with two equivalent Na(1)O5 trigonal bipyramids. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. Mg(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent W(2)O4 tetrahedra, corners with four equivalent Na(1)O5 trigonal bipyramids, and  an edgeedge with one W(1)O4 tetrahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted WO4 tetrahedra that share corners with six equivalent Na(1)O5 trigonal bipyramids and  an edgeedge with one Mg(1)O4 tetrahedra. In the second W site, W(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form WO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and corners with four equivalent Na(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form a mixture of corner and edge-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Mg(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Mg(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(1), and one W(2) atom. is represented by the CIF file [CIF]
data_Na4Mg(WO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.012
_cell_length_b   7.012
_cell_length_c   6.494
_cell_angle_alpha   62.415
_cell_angle_beta   62.415
_cell_angle_gamma   55.265
_symmetry_Int_Tables_number   1
_cell_volume   223.682
_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
  Na  Na0  1  0.026  0.026  0.457  1.0
  Na  Na1  1  0.085  0.554  0.931  1.0
  Na  Na2  1  0.554  0.085  0.931  1.0
  Na  Na3  1  0.026  0.026  0.991  1.0
  Mg  Mg4  1  0.591  0.591  0.159  1.0
  W  W5  1  0.325  0.325  0.425  1.0
  W  W6  1  0.631  0.631  0.619  1.0
  O  O7  1  0.250  0.250  0.758  1.0
  O  O8  1  0.246  0.668  0.293  1.0
  O  O9  1  0.668  0.246  0.293  1.0
  O  O10  1  0.250  0.250  0.243  1.0
  O  O11  1  0.709  0.709  0.273  1.0
  O  O12  1  0.787  0.294  0.710  1.0
  O  O13  1  0.294  0.787  0.710  1.0
  O  O14  1  0.709  0.709  0.808  1.0
[/CIF]
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The crystal structure described by Na4Mg(WO4)2 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent W(2)O4 tetrahedra, corners with three equivalent W(1)O4 tetrahedra, and edges with two equivalent Na(1)O5 trigonal bipyramids. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(1), and two equivalent O(3) atoms. Mg(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent W(2)O4 tetrahedra, corners with four equivalent Na(1)O5 trigonal bipyramids, and  an edgeedge with one W(1)O4 tetrahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted WO4 tetrahedra that share corners with six equivalent Na(1)O5 trigonal bipyramids and  an edgeedge with one Mg(1)O4 tetrahedra. In the second W site, W(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form WO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra and corners with four equivalent Na(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form a mixture of corner and edge-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Mg(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Mg(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(1), and one W(2) atom. is represented by the CIF file [CIF]
data_Na4Mg(WO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.012
_cell_length_b   7.012
_cell_length_c   6.494
_cell_angle_alpha   62.415
_cell_angle_beta   62.415
_cell_angle_gamma   55.265
_symmetry_Int_Tables_number   1
_cell_volume   223.682
_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
  Na  Na0  1  0.026  0.026  0.457  1.0
  Na  Na1  1  0.085  0.554  0.931  1.0
  Na  Na2  1  0.554  0.085  0.931  1.0
  Na  Na3  1  0.026  0.026  0.991  1.0
  Mg  Mg4  1  0.591  0.591  0.159  1.0
  W  W5  1  0.325  0.325  0.425  1.0
  W  W6  1  0.631  0.631  0.619  1.0
  O  O7  1  0.250  0.250  0.758  1.0
  O  O8  1  0.246  0.668  0.293  1.0
  O  O9  1  0.668  0.246  0.293  1.0
  O  O10  1  0.250  0.250  0.243  1.0
  O  O11  1  0.709  0.709  0.273  1.0
  O  O12  1  0.787  0.294  0.710  1.0
  O  O13  1  0.294  0.787  0.710  1.0
  O  O14  1  0.709  0.709  0.808  1.0
[/CIF]
.