The material structure described by Na3MnO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NaO5 trigonal bipyramids that share corners with three equivalent Mn(1)O4 tetrahedra, corners with two equivalent Na(2)O4 trigonal pyramids, edges with two equivalent Mn(1)O4 tetrahedra, edges with two equivalent Na(1)O5 trigonal bipyramids, and edges with two equivalent Na(2)O4 trigonal pyramids. In the second Na site, Na(2) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form NaO4 trigonal pyramids that share corners with five equivalent Mn(1)O4 tetrahedra, corners with two equivalent Na(1)O5 trigonal bipyramids, edges with two equivalent Na(1)O5 trigonal bipyramids, and  an edgeedge with one Na(2)O4 trigonal pyramid. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(1) atoms. Mn(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form MnO4 tetrahedra that share corners with three equivalent Na(1)O5 trigonal bipyramids, corners with five equivalent Na(2)O4 trigonal pyramids,  an edgeedge with one Mn(1)O4 tetrahedra, and edges with two equivalent Na(1)O5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), two equivalent Na(2), two equivalent Na(3), and one Mn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), two equivalent Na(1), and one Mn(1) atom. In the third O site, O(3) is bonded to one Na(2), one Na(3), two equivalent Na(1), and two equivalent Mn(1) atoms to form distorted edge-sharing ONa4Mn2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3MnO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.793
_cell_length_b   5.910
_cell_length_c   6.579
_cell_angle_alpha   65.812
_cell_angle_beta   89.452
_cell_angle_gamma   90.618
_symmetry_Int_Tables_number   1
_cell_volume   205.444
_cell_formula_units_Z   2
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
  Mn  Mn0  1  0.385  0.802  0.682  1.0
  Mn  Mn1  1  0.615  0.198  0.318  1.0
  Na  Na2  1  0.065  0.235  0.551  1.0
  Na  Na3  1  0.935  0.765  0.449  1.0
  Na  Na4  1  0.122  0.230  0.020  1.0
  Na  Na5  1  0.878  0.770  0.980  1.0
  Na  Na6  1  0.446  0.760  0.226  1.0
  Na  Na7  1  0.554  0.240  0.774  1.0
  O  O8  1  0.252  0.900  0.893  1.0
  O  O9  1  0.748  0.100  0.107  1.0
  O  O10  1  0.236  0.524  0.673  1.0
  O  O11  1  0.765  0.476  0.327  1.0
  O  O12  1  0.309  0.056  0.357  1.0
  O  O13  1  0.691  0.944  0.643  1.0
[/CIF]
.
The material structure described by Na3MnO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted NaO5 trigonal bipyramids that share corners with three equivalent Mn(1)O4 tetrahedra, corners with two equivalent Na(2)O4 trigonal pyramids, edges with two equivalent Mn(1)O4 tetrahedra, edges with two equivalent Na(1)O5 trigonal bipyramids, and edges with two equivalent Na(2)O4 trigonal pyramids. In the second Na site, Na(2) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form NaO4 trigonal pyramids that share corners with five equivalent Mn(1)O4 tetrahedra, corners with two equivalent Na(1)O5 trigonal bipyramids, edges with two equivalent Na(1)O5 trigonal bipyramids, and  an edgeedge with one Na(2)O4 trigonal pyramid. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(1) atoms. Mn(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form MnO4 tetrahedra that share corners with three equivalent Na(1)O5 trigonal bipyramids, corners with five equivalent Na(2)O4 trigonal pyramids,  an edgeedge with one Mn(1)O4 tetrahedra, and edges with two equivalent Na(1)O5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), two equivalent Na(2), two equivalent Na(3), and one Mn(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), two equivalent Na(1), and one Mn(1) atom. In the third O site, O(3) is bonded to one Na(2), one Na(3), two equivalent Na(1), and two equivalent Mn(1) atoms to form distorted edge-sharing ONa4Mn2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3MnO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.793
_cell_length_b   5.910
_cell_length_c   6.579
_cell_angle_alpha   65.812
_cell_angle_beta   89.452
_cell_angle_gamma   90.618
_symmetry_Int_Tables_number   1
_cell_volume   205.444
_cell_formula_units_Z   2
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
  Mn  Mn0  1  0.385  0.802  0.682  1.0
  Mn  Mn1  1  0.615  0.198  0.318  1.0
  Na  Na2  1  0.065  0.235  0.551  1.0
  Na  Na3  1  0.935  0.765  0.449  1.0
  Na  Na4  1  0.122  0.230  0.020  1.0
  Na  Na5  1  0.878  0.770  0.980  1.0
  Na  Na6  1  0.446  0.760  0.226  1.0
  Na  Na7  1  0.554  0.240  0.774  1.0
  O  O8  1  0.252  0.900  0.893  1.0
  O  O9  1  0.748  0.100  0.107  1.0
  O  O10  1  0.236  0.524  0.673  1.0
  O  O11  1  0.765  0.476  0.327  1.0
  O  O12  1  0.309  0.056  0.357  1.0
  O  O13  1  0.691  0.944  0.643  1.0
[/CIF]
.