The material described by Na4MgMn4O8 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the second Na site, Na(2) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(8) atom to form distorted NaO5 square pyramids that share  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to one O(1), one O(4), one O(5), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), one O(6), and one O(7) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), one O(7), and one O(8) atom. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(8) atom. In the third Mn site, Mn(3) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  an edgeedge with one Na(2)O5 square pyramid. In the fourth Mn site, Mn(4) is bonded in a square co-planar geometry to one O(2), one O(3), one O(6), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Mn(1), and one Mn(2) atom to form distorted ONa3Mn2 trigonal bipyramids that share edges with two equivalent O(5)Na3Mn3 octahedra and edges with two equivalent O(4)Na2MgMn2 trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(4), one Mg(1), one Mn(3), and one Mn(4) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(4), one Mg(1), one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Mg(1), one Mn(1), and one Mn(2) atom to form ONa2MgMn2 trigonal bipyramids that share corners with four equivalent O(5)Na3Mn3 octahedra and edges with two equivalent O(1)Na3Mn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 5-41°. In the fifth O site, O(5) is bonded to one Na(2), one Na(3), one Na(4), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONa3Mn3 octahedra that share corners with four equivalent O(4)Na2MgMn2 trigonal bipyramids and edges with two equivalent O(1)Na3Mn2 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), one Mn(3), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(4), one Mn(1), one Mn(3), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Mg(1), one Mn(1), and one Mn(2) atom. is represented by the CIF card [CIF]
data_Na4MgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.961
_cell_length_b   7.485
_cell_length_c   6.079
_cell_angle_alpha   66.751
_cell_angle_beta   92.490
_cell_angle_gamma   112.113
_symmetry_Int_Tables_number   1
_cell_volume   229.121
_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  0.500  0.450  0.974  1.0
  Na  Na1  1  0.948  0.936  0.541  1.0
  Na  Na2  1  0.492  0.980  0.519  1.0
  Na  Na3  1  0.409  0.315  0.570  1.0
  Mg  Mg4  1  0.665  0.696  0.258  1.0
  Mn  Mn5  1  0.009  0.090  0.969  1.0
  Mn  Mn6  1  0.458  0.964  0.034  1.0
  Mn  Mn7  1  0.061  0.592  0.943  1.0
  Mn  Mn8  1  0.016  0.516  0.472  1.0
  O  O9  1  0.283  0.062  0.187  1.0
  O  O10  1  0.800  0.500  0.227  1.0
  O  O11  1  0.293  0.567  0.257  1.0
  O  O12  1  0.715  0.979  0.244  1.0
  O  O13  1  0.222  0.947  0.805  1.0
  O  O14  1  0.790  0.575  0.617  1.0
  O  O15  1  0.158  0.426  0.768  1.0
  O  O16  1  0.682  0.906  0.866  1.0
[/CIF]
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The material described by Na4MgMn4O8 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the second Na site, Na(2) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(8) atom to form distorted NaO5 square pyramids that share  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to one O(1), one O(4), one O(5), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(5), one O(6), and one O(7) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 5-coordinate geometry to one O(1), one O(4), one O(5), one O(7), and one O(8) atom. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(8) atom. In the third Mn site, Mn(3) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  an edgeedge with one Na(2)O5 square pyramid. In the fourth Mn site, Mn(4) is bonded in a square co-planar geometry to one O(2), one O(3), one O(6), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(3), one Mn(1), and one Mn(2) atom to form distorted ONa3Mn2 trigonal bipyramids that share edges with two equivalent O(5)Na3Mn3 octahedra and edges with two equivalent O(4)Na2MgMn2 trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(4), one Mg(1), one Mn(3), and one Mn(4) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(4), one Mg(1), one Mn(2), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded to one Na(2), one Na(3), one Mg(1), one Mn(1), and one Mn(2) atom to form ONa2MgMn2 trigonal bipyramids that share corners with four equivalent O(5)Na3Mn3 octahedra and edges with two equivalent O(1)Na3Mn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 5-41°. In the fifth O site, O(5) is bonded to one Na(2), one Na(3), one Na(4), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONa3Mn3 octahedra that share corners with four equivalent O(4)Na2MgMn2 trigonal bipyramids and edges with two equivalent O(1)Na3Mn2 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), one Mn(3), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(4), one Mn(1), one Mn(3), and one Mn(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Mg(1), one Mn(1), and one Mn(2) atom. is represented by the CIF card [CIF]
data_Na4MgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.961
_cell_length_b   7.485
_cell_length_c   6.079
_cell_angle_alpha   66.751
_cell_angle_beta   92.490
_cell_angle_gamma   112.113
_symmetry_Int_Tables_number   1
_cell_volume   229.121
_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  0.500  0.450  0.974  1.0
  Na  Na1  1  0.948  0.936  0.541  1.0
  Na  Na2  1  0.492  0.980  0.519  1.0
  Na  Na3  1  0.409  0.315  0.570  1.0
  Mg  Mg4  1  0.665  0.696  0.258  1.0
  Mn  Mn5  1  0.009  0.090  0.969  1.0
  Mn  Mn6  1  0.458  0.964  0.034  1.0
  Mn  Mn7  1  0.061  0.592  0.943  1.0
  Mn  Mn8  1  0.016  0.516  0.472  1.0
  O  O9  1  0.283  0.062  0.187  1.0
  O  O10  1  0.800  0.500  0.227  1.0
  O  O11  1  0.293  0.567  0.257  1.0
  O  O12  1  0.715  0.979  0.244  1.0
  O  O13  1  0.222  0.947  0.805  1.0
  O  O14  1  0.790  0.575  0.617  1.0
  O  O15  1  0.158  0.426  0.768  1.0
  O  O16  1  0.682  0.906  0.866  1.0
[/CIF]
.