The structure described by Na8MgMn2O8 crystallizes in the triclinic P1 space group. There are eight 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(7), and one O(8) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(7), 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(2), one O(3), one O(4), and one O(5) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. In the fifth Na site, Na(5) is bonded in a 4-coordinate geometry to one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a distorted see-saw-like geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the seventh Na site, Na(7) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the eighth Na site, Na(8) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with three equivalent Mn(2)O4 tetrahedra, and  a cornercorner with one Mn(1)O4 trigonal pyramid. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form MgO4 tetrahedra that share  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Mn(2)O4 tetrahedra, and corners with three equivalent Mn(1)O4 trigonal pyramids. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted MnO4 trigonal pyramids that share  a cornercorner with one Na(8)O4 tetrahedra and corners with three equivalent Mg(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form distorted MnO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra and corners with three equivalent Na(8)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Na(8), and one Mn(2) atom. 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(8), one Mg(1), and one Mn(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(3), one Na(4), one Na(7), one Mg(1), and one Mn(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Na(5), one Mg(1), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Mg(1), and one Mn(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(5), one Na(6), one Na(7), one Na(8), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(5), one Na(6), one Na(7), and one Mn(2) atom. is represented by the CIF file [CIF]
data_Na8MgMn2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.050
_cell_length_b   5.838
_cell_length_c   5.829
_cell_angle_alpha   73.265
_cell_angle_beta   117.765
_cell_angle_gamma   101.657
_symmetry_Int_Tables_number   1
_cell_volume   260.123
_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  0.051  0.035  0.556  1.0
  Na  Na1  1  0.100  0.500  0.115  1.0
  Na  Na2  1  0.319  0.463  0.717  1.0
  Na  Na3  1  0.380  0.073  0.135  1.0
  Na  Na4  1  0.680  0.105  0.698  1.0
  Na  Na5  1  0.714  0.540  0.931  1.0
  Na  Na6  1  0.703  0.994  0.286  1.0
  Na  Na7  1  0.931  0.526  0.548  1.0
  Mg  Mg8  1  0.362  0.916  0.610  1.0
  Mn  Mn9  1  0.492  0.545  0.321  1.0
  Mn  Mn10  1  0.016  0.998  0.039  1.0
  O  O11  1  0.123  0.250  0.863  1.0
  O  O12  1  0.130  0.781  0.393  1.0
  O  O13  1  0.442  0.787  0.995  1.0
  O  O14  1  0.405  0.266  0.518  1.0
  O  O15  1  0.505  0.770  0.520  1.0
  O  O16  1  0.636  0.371  0.286  1.0
  O  O17  1  0.917  0.792  0.793  1.0
  O  O18  1  0.891  0.179  0.110  1.0
[/CIF]
.
The structure described by Na8MgMn2O8 crystallizes in the triclinic P1 space group. There are eight 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(7), and one O(8) atom. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(7), 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(2), one O(3), one O(4), and one O(5) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. In the fifth Na site, Na(5) is bonded in a 4-coordinate geometry to one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a distorted see-saw-like geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the seventh Na site, Na(7) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the eighth Na site, Na(8) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form NaO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with three equivalent Mn(2)O4 tetrahedra, and  a cornercorner with one Mn(1)O4 trigonal pyramid. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form MgO4 tetrahedra that share  a cornercorner with one Na(8)O4 tetrahedra,  a cornercorner with one Mn(2)O4 tetrahedra, and corners with three equivalent Mn(1)O4 trigonal pyramids. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form distorted MnO4 trigonal pyramids that share  a cornercorner with one Na(8)O4 tetrahedra and corners with three equivalent Mg(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form distorted MnO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra and corners with three equivalent Na(8)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Na(8), and one Mn(2) atom. 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(8), one Mg(1), and one Mn(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(3), one Na(4), one Na(7), one Mg(1), and one Mn(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(4), one Na(5), one Mg(1), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a 7-coordinate geometry to one Na(3), one Na(4), one Na(5), one Na(6), one Na(7), one Mg(1), and one Mn(1) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Na(4), one Na(5), one Na(6), one Na(7), one Na(8), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(5), one Na(6), one Na(7), one Na(8), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(5), one Na(6), one Na(7), and one Mn(2) atom. is represented by the CIF file [CIF]
data_Na8MgMn2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.050
_cell_length_b   5.838
_cell_length_c   5.829
_cell_angle_alpha   73.265
_cell_angle_beta   117.765
_cell_angle_gamma   101.657
_symmetry_Int_Tables_number   1
_cell_volume   260.123
_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  0.051  0.035  0.556  1.0
  Na  Na1  1  0.100  0.500  0.115  1.0
  Na  Na2  1  0.319  0.463  0.717  1.0
  Na  Na3  1  0.380  0.073  0.135  1.0
  Na  Na4  1  0.680  0.105  0.698  1.0
  Na  Na5  1  0.714  0.540  0.931  1.0
  Na  Na6  1  0.703  0.994  0.286  1.0
  Na  Na7  1  0.931  0.526  0.548  1.0
  Mg  Mg8  1  0.362  0.916  0.610  1.0
  Mn  Mn9  1  0.492  0.545  0.321  1.0
  Mn  Mn10  1  0.016  0.998  0.039  1.0
  O  O11  1  0.123  0.250  0.863  1.0
  O  O12  1  0.130  0.781  0.393  1.0
  O  O13  1  0.442  0.787  0.995  1.0
  O  O14  1  0.405  0.266  0.518  1.0
  O  O15  1  0.505  0.770  0.520  1.0
  O  O16  1  0.636  0.371  0.286  1.0
  O  O17  1  0.917  0.792  0.793  1.0
  O  O18  1  0.891  0.179  0.110  1.0
[/CIF]
.