The material structure described by Na2MgMn4O8 crystallizes in the triclinic P1 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(3), one O(4), one O(8), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(7), one O(8), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. Mg(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and edges with two equivalent Mn(4)O6 octahedra. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(6), one O(8), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(4)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-71°. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(5), and two equivalent O(7) atoms. In the third Mn site, Mn(3) is bonded to one O(3), one O(6), one O(7), and two equivalent O(1) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and corners with two equivalent Mn(3)O5 trigonal bipyramids. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent Mn(4)O6 octahedra, edges with two equivalent Mg(1)O4 tetrahedra, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Na(2), one Mn(2), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded to two equivalent Na(2), one Mn(4), and two equivalent Mn(1) atoms to form distorted ONa2Mn3 square pyramids that share corners with four equivalent O(6)Na2Mn2 trigonal pyramids, edges with two equivalent O(2)Na2Mn3 square pyramids, and  an edgeedge with one O(6)Na2Mn2 trigonal pyramid. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Mg(1), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), one Mn(1), and two equivalent Mn(4) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), one Mn(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mn(1), and one Mn(3) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with four equivalent O(2)Na2Mn3 square pyramids, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(2)Na2Mn3 square pyramid. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mn(1), and two equivalent Mn(4) atoms. is represented by the CIF card [CIF]
data_Na2MgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.228
_cell_length_b   5.689
_cell_length_c   10.336
_cell_angle_alpha   89.551
_cell_angle_beta   90.350
_cell_angle_gamma   68.749
_symmetry_Int_Tables_number   1
_cell_volume   176.928
_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  0.193  0.353  0.212  1.0
  Na  Na1  1  0.908  0.699  0.764  1.0
  Mg  Mg2  1  0.882  0.868  0.258  1.0
  Mn  Mn3  1  0.641  0.223  0.916  1.0
  Mn  Mn4  1  0.455  0.755  0.483  1.0
  Mn  Mn5  1  0.594  0.211  0.587  1.0
  Mn  Mn6  1  0.442  0.779  0.037  1.0
  O  O7  1  0.196  0.973  0.623  1.0
  O  O8  1  0.253  0.984  0.885  1.0
  O  O9  1  0.644  0.026  0.418  1.0
  O  O10  1  0.709  0.041  0.092  1.0
  O  O11  1  0.506  0.669  0.233  1.0
  O  O12  1  0.581  0.373  0.748  1.0
  O  O13  1  0.138  0.526  0.507  1.0
  O  O14  1  0.169  0.533  0.990  1.0
[/CIF]
.
The material structure described by Na2MgMn4O8 crystallizes in the triclinic P1 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(3), one O(4), one O(8), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(7), one O(8), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. Mg(1) is bonded to one O(3), one O(4), and two equivalent O(5) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and edges with two equivalent Mn(4)O6 octahedra. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(6), one O(8), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(4)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-71°. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(5), and two equivalent O(7) atoms. In the third Mn site, Mn(3) is bonded to one O(3), one O(6), one O(7), and two equivalent O(1) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and corners with two equivalent Mn(3)O5 trigonal bipyramids. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent Mn(4)O6 octahedra, edges with two equivalent Mg(1)O4 tetrahedra, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Na(2), one Mn(2), and two equivalent Mn(3) atoms. In the second O site, O(2) is bonded to two equivalent Na(2), one Mn(4), and two equivalent Mn(1) atoms to form distorted ONa2Mn3 square pyramids that share corners with four equivalent O(6)Na2Mn2 trigonal pyramids, edges with two equivalent O(2)Na2Mn3 square pyramids, and  an edgeedge with one O(6)Na2Mn2 trigonal pyramid. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Mg(1), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), one Mn(1), and two equivalent Mn(4) atoms. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), one Mn(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mn(1), and one Mn(3) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with four equivalent O(2)Na2Mn3 square pyramids, corners with two equivalent O(6)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(2)Na2Mn3 square pyramid. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Mn(1), and two equivalent Mn(4) atoms. is represented by the CIF card [CIF]
data_Na2MgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.228
_cell_length_b   5.689
_cell_length_c   10.336
_cell_angle_alpha   89.551
_cell_angle_beta   90.350
_cell_angle_gamma   68.749
_symmetry_Int_Tables_number   1
_cell_volume   176.928
_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  0.193  0.353  0.212  1.0
  Na  Na1  1  0.908  0.699  0.764  1.0
  Mg  Mg2  1  0.882  0.868  0.258  1.0
  Mn  Mn3  1  0.641  0.223  0.916  1.0
  Mn  Mn4  1  0.455  0.755  0.483  1.0
  Mn  Mn5  1  0.594  0.211  0.587  1.0
  Mn  Mn6  1  0.442  0.779  0.037  1.0
  O  O7  1  0.196  0.973  0.623  1.0
  O  O8  1  0.253  0.984  0.885  1.0
  O  O9  1  0.644  0.026  0.418  1.0
  O  O10  1  0.709  0.041  0.092  1.0
  O  O11  1  0.506  0.669  0.233  1.0
  O  O12  1  0.581  0.373  0.748  1.0
  O  O13  1  0.138  0.526  0.507  1.0
  O  O14  1  0.169  0.533  0.990  1.0
[/CIF]
.