The material described by Na4Mg(Mo2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(4), and one O(5) atom. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded to one O(10), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO5 square pyramids that share corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Mo(2)O6 octahedra,  a cornercorner with one Mo(4)O5 trigonal bipyramid, and  an edgeedge with one Mo(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 21-42°. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, and  an edgeedge with one Mo(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-45°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, and corners with two equivalent Mo(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-45°. In the third Mo site, Mo(3) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(5), one O(8), and one O(9) atom. In the fourth Mo site, Mo(4) is bonded to one O(10), one O(3), one O(6), one O(7), and one O(9) atom to form distorted MoO5 trigonal bipyramids that share corners with two equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid,  an edgeedge with one Mo(1)O6 octahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 47-52°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom to form distorted ONa4Mo2 octahedra that share corners with two equivalent O(9)Na2Mo2 tetrahedra,  a cornercorner with one O(6)Na2MgMo2 trigonal bipyramid, and  an edgeedge with one O(6)Na2MgMo2 trigonal bipyramid. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mo(1), one Mo(2), and one Mo(4) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Mg(1), one Mo(1), and one Mo(3) atom. In the sixth O site, O(6) is bonded to one Na(2), one Na(4), one Mg(1), one Mo(1), and one Mo(4) atom to form distorted ONa2MgMo2 trigonal bipyramids that share  a cornercorner with one O(1)Na4Mo2 octahedra, corners with two equivalent O(9)Na2Mo2 tetrahedra, and  an edgeedge with one O(1)Na4Mo2 octahedra. The corner-sharing octahedral tilt angles are 53°. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Mo(2), and one Mo(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one Mo(2), and one Mo(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Mo(3), and one Mo(4) atom to form ONa2Mo2 tetrahedra that share corners with two equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(6)Na2MgMo2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 17-83°. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Mg(1), one Mo(3), and one Mo(4) atom. is represented by the CIF file [CIF]
data_Na4Mg(Mo2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.927
_cell_length_b   5.982
_cell_length_c   7.971
_cell_angle_alpha   110.632
_cell_angle_beta   109.470
_cell_angle_gamma   91.589
_symmetry_Int_Tables_number   1
_cell_volume   245.969
_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  0.405  0.940  0.770  1.0
  Na  Na1  1  0.572  0.045  0.161  1.0
  Na  Na2  1  0.889  0.406  0.837  1.0
  Na  Na3  1  0.077  0.655  0.207  1.0
  Mg  Mg4  1  0.943  0.077  0.516  1.0
  Mo  Mo5  1  0.971  0.002  0.002  1.0
  Mo  Mo6  1  0.474  0.505  0.000  1.0
  Mo  Mo7  1  0.844  0.603  0.497  1.0
  Mo  Mo8  1  0.328  0.329  0.449  1.0
  O  O9  1  0.737  0.256  0.012  1.0
  O  O10  1  0.689  0.731  0.924  1.0
  O  O11  1  0.269  0.293  0.125  1.0
  O  O12  1  0.208  0.756  0.996  1.0
  O  O13  1  0.906  0.936  0.702  1.0
  O  O14  1  0.015  0.083  0.293  1.0
  O  O15  1  0.275  0.286  0.690  1.0
  O  O16  1  0.679  0.739  0.309  1.0
  O  O17  1  0.171  0.638  0.495  1.0
  O  O18  1  0.704  0.313  0.516  1.0
[/CIF]
.
The material described by Na4Mg(Mo2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(4), and one O(5) atom. In the fourth Na site, Na(4) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded to one O(10), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO5 square pyramids that share corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Mo(2)O6 octahedra,  a cornercorner with one Mo(4)O5 trigonal bipyramid, and  an edgeedge with one Mo(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 21-42°. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, and  an edgeedge with one Mo(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-45°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with two equivalent Mg(1)O5 square pyramids, and corners with two equivalent Mo(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-45°. In the third Mo site, Mo(3) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(5), one O(8), and one O(9) atom. In the fourth Mo site, Mo(4) is bonded to one O(10), one O(3), one O(6), one O(7), and one O(9) atom to form distorted MoO5 trigonal bipyramids that share corners with two equivalent Mo(2)O6 octahedra,  a cornercorner with one Mg(1)O5 square pyramid,  an edgeedge with one Mo(1)O6 octahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 47-52°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom to form distorted ONa4Mo2 octahedra that share corners with two equivalent O(9)Na2Mo2 tetrahedra,  a cornercorner with one O(6)Na2MgMo2 trigonal bipyramid, and  an edgeedge with one O(6)Na2MgMo2 trigonal bipyramid. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mo(1), one Mo(2), and one Mo(4) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Mo(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Mg(1), one Mo(1), and one Mo(3) atom. In the sixth O site, O(6) is bonded to one Na(2), one Na(4), one Mg(1), one Mo(1), and one Mo(4) atom to form distorted ONa2MgMo2 trigonal bipyramids that share  a cornercorner with one O(1)Na4Mo2 octahedra, corners with two equivalent O(9)Na2Mo2 tetrahedra, and  an edgeedge with one O(1)Na4Mo2 octahedra. The corner-sharing octahedral tilt angles are 53°. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one Mo(2), and one Mo(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one Mo(2), and one Mo(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one Mo(3), and one Mo(4) atom to form ONa2Mo2 tetrahedra that share corners with two equivalent O(1)Na4Mo2 octahedra and corners with two equivalent O(6)Na2MgMo2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 17-83°. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Mg(1), one Mo(3), and one Mo(4) atom. is represented by the CIF file [CIF]
data_Na4Mg(Mo2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.927
_cell_length_b   5.982
_cell_length_c   7.971
_cell_angle_alpha   110.632
_cell_angle_beta   109.470
_cell_angle_gamma   91.589
_symmetry_Int_Tables_number   1
_cell_volume   245.969
_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  0.405  0.940  0.770  1.0
  Na  Na1  1  0.572  0.045  0.161  1.0
  Na  Na2  1  0.889  0.406  0.837  1.0
  Na  Na3  1  0.077  0.655  0.207  1.0
  Mg  Mg4  1  0.943  0.077  0.516  1.0
  Mo  Mo5  1  0.971  0.002  0.002  1.0
  Mo  Mo6  1  0.474  0.505  0.000  1.0
  Mo  Mo7  1  0.844  0.603  0.497  1.0
  Mo  Mo8  1  0.328  0.329  0.449  1.0
  O  O9  1  0.737  0.256  0.012  1.0
  O  O10  1  0.689  0.731  0.924  1.0
  O  O11  1  0.269  0.293  0.125  1.0
  O  O12  1  0.208  0.756  0.996  1.0
  O  O13  1  0.906  0.936  0.702  1.0
  O  O14  1  0.015  0.083  0.293  1.0
  O  O15  1  0.275  0.286  0.690  1.0
  O  O16  1  0.679  0.739  0.309  1.0
  O  O17  1  0.171  0.638  0.495  1.0
  O  O18  1  0.704  0.313  0.516  1.0
[/CIF]
.