The compound described by Na2Mn3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(6) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and two equivalent O(7) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form edge-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(3) atoms to form edge-sharing MnO6 octahedra. In the third Mn site, Mn(3) is bonded to one O(1), one O(3), one O(4), one O(7), and two equivalent O(2) atoms to form edge-sharing MnO6 octahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mn(2), and one Mn(3) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(7)Na2Mn3 square pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids, corners with three equivalent O(6)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(7)Na2Mn3 square pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Mn(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded to one Na(2), one Mn(2), and two equivalent Mn(1) atoms to form ONaMn3 trigonal pyramids that share  a cornercorner with one O(7)Na2Mn3 square pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, edges with two equivalent O(7)Na2Mn3 square pyramids,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(2) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(7)Na2Mn3 square pyramids, corners with three equivalent O(1)Na2Mn2 trigonal pyramids,  an edgeedge with one O(7)Na2Mn3 square pyramid, and edges with two equivalent O(5)NaMn3 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Na(2), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONa2Mn3 square pyramids that share  a cornercorner with one O(5)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)Na2Mn2 trigonal pyramids,  an edgeedge with one O(7)Na2Mn3 square pyramid,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(6)Na2Mn2 trigonal pyramid, and edges with two equivalent O(5)NaMn3 trigonal pyramids. is represented by the CIF file [CIF]
data_Na2Mn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.687
_cell_length_b   6.705
_cell_length_c   7.527
_cell_angle_alpha   103.436
_cell_angle_beta   109.403
_cell_angle_gamma   111.277
_symmetry_Int_Tables_number   1
_cell_volume   271.652
_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
  Na  Na0  1  0.263  0.688  0.477  1.0
  Na  Na1  1  0.737  0.312  0.523  1.0
  Na  Na2  1  0.336  0.827  0.062  1.0
  Na  Na3  1  0.664  0.173  0.938  1.0
  Mn  Mn4  1  0.923  0.921  0.779  1.0
  Mn  Mn5  1  0.077  0.079  0.221  1.0
  Mn  Mn6  1  0.358  0.360  0.081  1.0
  Mn  Mn7  1  0.642  0.640  0.919  1.0
  Mn  Mn8  1  0.221  0.219  0.642  1.0
  Mn  Mn9  1  0.779  0.781  0.358  1.0
  O  O10  1  0.547  0.356  0.722  1.0
  O  O11  1  0.453  0.644  0.278  1.0
  O  O12  1  0.877  0.057  0.585  1.0
  O  O13  1  0.123  0.943  0.415  1.0
  O  O14  1  0.310  0.490  0.866  1.0
  O  O15  1  0.690  0.510  0.134  1.0
  O  O16  1  0.870  0.680  0.564  1.0
  O  O17  1  0.130  0.320  0.436  1.0
  O  O18  1  0.971  0.792  0.982  1.0
  O  O19  1  0.029  0.208  0.018  1.0
  O  O20  1  0.387  0.198  0.247  1.0
  O  O21  1  0.613  0.802  0.753  1.0
  O  O22  1  0.737  0.916  0.153  1.0
  O  O23  1  0.263  0.084  0.847  1.0
[/CIF]
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The compound described by Na2Mn3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(6) atom. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and two equivalent O(7) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form edge-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(3) atoms to form edge-sharing MnO6 octahedra. In the third Mn site, Mn(3) is bonded to one O(1), one O(3), one O(4), one O(7), and two equivalent O(2) atoms to form edge-sharing MnO6 octahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mn(2), and one Mn(3) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(7)Na2Mn3 square pyramids, corners with two equivalent O(5)NaMn3 trigonal pyramids, corners with three equivalent O(6)Na2Mn2 trigonal pyramids, and  an edgeedge with one O(7)Na2Mn3 square pyramid. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Mn(3), and two equivalent Mn(2) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Mn(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded to one Na(2), one Mn(2), and two equivalent Mn(1) atoms to form ONaMn3 trigonal pyramids that share  a cornercorner with one O(7)Na2Mn3 square pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, edges with two equivalent O(7)Na2Mn3 square pyramids,  an edgeedge with one O(5)NaMn3 trigonal pyramid, and edges with two equivalent O(6)Na2Mn2 trigonal pyramids. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Mn(1), and one Mn(2) atom to form distorted ONa2Mn2 trigonal pyramids that share corners with two equivalent O(7)Na2Mn3 square pyramids, corners with three equivalent O(1)Na2Mn2 trigonal pyramids,  an edgeedge with one O(7)Na2Mn3 square pyramid, and edges with two equivalent O(5)NaMn3 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Na(2), one Mn(1), one Mn(2), and one Mn(3) atom to form distorted ONa2Mn3 square pyramids that share  a cornercorner with one O(5)NaMn3 trigonal pyramid, corners with two equivalent O(1)Na2Mn2 trigonal pyramids, corners with two equivalent O(6)Na2Mn2 trigonal pyramids,  an edgeedge with one O(7)Na2Mn3 square pyramid,  an edgeedge with one O(1)Na2Mn2 trigonal pyramid,  an edgeedge with one O(6)Na2Mn2 trigonal pyramid, and edges with two equivalent O(5)NaMn3 trigonal pyramids. is represented by the CIF file [CIF]
data_Na2Mn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.687
_cell_length_b   6.705
_cell_length_c   7.527
_cell_angle_alpha   103.436
_cell_angle_beta   109.403
_cell_angle_gamma   111.277
_symmetry_Int_Tables_number   1
_cell_volume   271.652
_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
  Na  Na0  1  0.263  0.688  0.477  1.0
  Na  Na1  1  0.737  0.312  0.523  1.0
  Na  Na2  1  0.336  0.827  0.062  1.0
  Na  Na3  1  0.664  0.173  0.938  1.0
  Mn  Mn4  1  0.923  0.921  0.779  1.0
  Mn  Mn5  1  0.077  0.079  0.221  1.0
  Mn  Mn6  1  0.358  0.360  0.081  1.0
  Mn  Mn7  1  0.642  0.640  0.919  1.0
  Mn  Mn8  1  0.221  0.219  0.642  1.0
  Mn  Mn9  1  0.779  0.781  0.358  1.0
  O  O10  1  0.547  0.356  0.722  1.0
  O  O11  1  0.453  0.644  0.278  1.0
  O  O12  1  0.877  0.057  0.585  1.0
  O  O13  1  0.123  0.943  0.415  1.0
  O  O14  1  0.310  0.490  0.866  1.0
  O  O15  1  0.690  0.510  0.134  1.0
  O  O16  1  0.870  0.680  0.564  1.0
  O  O17  1  0.130  0.320  0.436  1.0
  O  O18  1  0.971  0.792  0.982  1.0
  O  O19  1  0.029  0.208  0.018  1.0
  O  O20  1  0.387  0.198  0.247  1.0
  O  O21  1  0.613  0.802  0.753  1.0
  O  O22  1  0.737  0.916  0.153  1.0
  O  O23  1  0.263  0.084  0.847  1.0
[/CIF]
.