The structure described by Na4MgV4O10 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one O(10), one O(2), one O(6), and one O(8) atom. In the third Na site, Na(3) 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(5), and one O(7) 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 in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent V sites. In the first V site, V(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 VO6 octahedra that share corners with four equivalent V(2)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 7°. In the second V site, V(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 VO6 octahedra that share corners with four equivalent V(1)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 7°. In the third V site, V(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra, and corners with two equivalent V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-41°. In the fourth V site, V(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra, and corners with two equivalent V(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-41°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom. In the third O site, O(3) is bonded to one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom to form distorted ONa2MgV2 trigonal bipyramids that share  a cornercorner with one O(10)Na2V2 tetrahedra,  a cornercorner with one O(9)Na2V2 tetrahedra,  an edgeedge with one O(4)Na2MgV2 trigonal bipyramid, and  a faceface with one O(4)Na2MgV2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom to form distorted ONa2MgV2 trigonal bipyramids that share  a cornercorner with one O(10)Na2V2 tetrahedra,  a cornercorner with one O(9)Na2V2 tetrahedra,  an edgeedge with one O(3)Na2MgV2 trigonal bipyramid, and  a faceface with one O(3)Na2MgV2 trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one V(1), and one V(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one V(1), and one V(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one V(2), and one V(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one V(2), and one V(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one V(3), and one V(4) atom to form distorted ONa2V2 tetrahedra that share corners with two equivalent O(10)Na2V2 tetrahedra,  a cornercorner with one O(3)Na2MgV2 trigonal bipyramid, and  a cornercorner with one O(4)Na2MgV2 trigonal bipyramid. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one V(3), and one V(4) atom to form distorted ONa2V2 tetrahedra that share corners with two equivalent O(9)Na2V2 tetrahedra,  a cornercorner with one O(3)Na2MgV2 trigonal bipyramid, and  a cornercorner with one O(4)Na2MgV2 trigonal bipyramid. is represented by the CIF file [CIF]
data_Na4MgV4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.701
_cell_length_b   5.878
_cell_length_c   8.298
_cell_angle_alpha   109.558
_cell_angle_beta   110.077
_cell_angle_gamma   90.014
_symmetry_Int_Tables_number   1
_cell_volume   243.987
_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  0.574  0.308  0.349  1.0
  Na  Na1  1  0.222  0.690  0.649  1.0
  Na  Na2  1  0.107  0.567  0.193  1.0
  Na  Na3  1  0.913  0.434  0.807  1.0
  Mg  Mg4  1  0.547  1.000  0.999  1.0
  V  V5  1  0.034  0.000  0.000  1.0
  V  V6  1  0.536  0.500  0.000  1.0
  V  V7  1  0.196  0.145  0.500  1.0
  V  V8  1  0.697  0.855  0.501  1.0
  O  O9  1  0.303  0.241  0.008  1.0
  O  O10  1  0.294  0.759  0.992  1.0
  O  O11  1  0.776  0.237  0.983  1.0
  O  O12  1  0.793  0.763  0.017  1.0
  O  O13  1  0.169  0.200  0.298  1.0
  O  O14  1  0.871  0.801  0.703  1.0
  O  O15  1  0.689  0.628  0.295  1.0
  O  O16  1  0.394  0.373  0.706  1.0
  O  O17  1  0.870  0.139  0.514  1.0
  O  O18  1  0.356  0.861  0.486  1.0
[/CIF]
.
The structure described by Na4MgV4O10 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(5), one O(7), and one O(9) atom. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one O(10), one O(2), one O(6), and one O(8) atom. In the third Na site, Na(3) 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(5), and one O(7) 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 in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent V sites. In the first V site, V(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 VO6 octahedra that share corners with four equivalent V(2)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 7°. In the second V site, V(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 VO6 octahedra that share corners with four equivalent V(1)O6 octahedra,  a cornercorner with one V(3)O4 tetrahedra, and  a cornercorner with one V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 7°. In the third V site, V(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra, and corners with two equivalent V(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-41°. In the fourth V site, V(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra,  a cornercorner with one V(2)O6 octahedra, and corners with two equivalent V(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-41°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom. In the third O site, O(3) is bonded to one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom to form distorted ONa2MgV2 trigonal bipyramids that share  a cornercorner with one O(10)Na2V2 tetrahedra,  a cornercorner with one O(9)Na2V2 tetrahedra,  an edgeedge with one O(4)Na2MgV2 trigonal bipyramid, and  a faceface with one O(4)Na2MgV2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Na(3), one Na(4), one Mg(1), one V(1), and one V(2) atom to form distorted ONa2MgV2 trigonal bipyramids that share  a cornercorner with one O(10)Na2V2 tetrahedra,  a cornercorner with one O(9)Na2V2 tetrahedra,  an edgeedge with one O(3)Na2MgV2 trigonal bipyramid, and  a faceface with one O(3)Na2MgV2 trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one V(1), and one V(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one V(1), and one V(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one V(2), and one V(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one V(2), and one V(3) atom. In the ninth O site, O(9) is bonded to one Na(1), one Na(4), one V(3), and one V(4) atom to form distorted ONa2V2 tetrahedra that share corners with two equivalent O(10)Na2V2 tetrahedra,  a cornercorner with one O(3)Na2MgV2 trigonal bipyramid, and  a cornercorner with one O(4)Na2MgV2 trigonal bipyramid. In the tenth O site, O(10) is bonded to one Na(2), one Na(3), one V(3), and one V(4) atom to form distorted ONa2V2 tetrahedra that share corners with two equivalent O(9)Na2V2 tetrahedra,  a cornercorner with one O(3)Na2MgV2 trigonal bipyramid, and  a cornercorner with one O(4)Na2MgV2 trigonal bipyramid. is represented by the CIF file [CIF]
data_Na4MgV4O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.701
_cell_length_b   5.878
_cell_length_c   8.298
_cell_angle_alpha   109.558
_cell_angle_beta   110.077
_cell_angle_gamma   90.014
_symmetry_Int_Tables_number   1
_cell_volume   243.987
_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  0.574  0.308  0.349  1.0
  Na  Na1  1  0.222  0.690  0.649  1.0
  Na  Na2  1  0.107  0.567  0.193  1.0
  Na  Na3  1  0.913  0.434  0.807  1.0
  Mg  Mg4  1  0.547  1.000  0.999  1.0
  V  V5  1  0.034  0.000  0.000  1.0
  V  V6  1  0.536  0.500  0.000  1.0
  V  V7  1  0.196  0.145  0.500  1.0
  V  V8  1  0.697  0.855  0.501  1.0
  O  O9  1  0.303  0.241  0.008  1.0
  O  O10  1  0.294  0.759  0.992  1.0
  O  O11  1  0.776  0.237  0.983  1.0
  O  O12  1  0.793  0.763  0.017  1.0
  O  O13  1  0.169  0.200  0.298  1.0
  O  O14  1  0.871  0.801  0.703  1.0
  O  O15  1  0.689  0.628  0.295  1.0
  O  O16  1  0.394  0.373  0.706  1.0
  O  O17  1  0.870  0.139  0.514  1.0
  O  O18  1  0.356  0.861  0.486  1.0
[/CIF]
.