The material structure described by NaMn8O16 crystallizes in the orthorhombic Pmmn space group. Na(1) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form NaO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(3)O6 octahedra, and corners with four equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the fourth Mn site, Mn(4) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Na(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(4) atoms. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3) and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fifth O site, O(4) is bonded to one Na(1), one Mn(1), and two equivalent Mn(3) atoms to form a mixture of corner and edge-sharing ONaMn3 tetrahedra. In the sixth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the seventh O site, O(6) is bonded to one Na(1), one Mn(2), and two equivalent Mn(4) atoms to form corner-sharing ONaMn3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaMn8O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.924
_cell_length_b   8.380
_cell_length_c   11.858
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   588.708
_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  0.500  0.374  0.000  1.0
  Na  Na1  1  0.000  0.626  0.500  1.0
  Mn  Mn2  1  0.247  0.995  0.000  1.0
  Mn  Mn3  1  0.253  0.005  0.500  1.0
  Mn  Mn4  1  0.753  0.995  0.000  1.0
  Mn  Mn5  1  0.747  0.005  0.500  1.0
  Mn  Mn6  1  0.000  0.245  0.374  1.0
  Mn  Mn7  1  0.000  0.245  0.873  1.0
  Mn  Mn8  1  0.000  0.245  0.127  1.0
  Mn  Mn9  1  0.000  0.245  0.626  1.0
  Mn  Mn10  1  0.750  0.500  0.750  1.0
  Mn  Mn11  1  0.250  0.500  0.250  1.0
  Mn  Mn12  1  0.750  0.500  0.250  1.0
  Mn  Mn13  1  0.250  0.500  0.750  1.0
  Mn  Mn14  1  0.500  0.755  0.874  1.0
  Mn  Mn15  1  0.500  0.755  0.126  1.0
  Mn  Mn16  1  0.500  0.755  0.627  1.0
  Mn  Mn17  1  0.500  0.755  0.373  1.0
  O  O18  1  0.000  0.015  0.392  1.0
  O  O19  1  0.000  0.011  0.891  1.0
  O  O20  1  0.000  0.011  0.109  1.0
  O  O21  1  0.000  0.015  0.608  1.0
  O  O22  1  0.784  0.235  0.500  1.0
  O  O23  1  0.788  0.226  0.000  1.0
  O  O24  1  0.216  0.235  0.500  1.0
  O  O25  1  0.212  0.226  0.000  1.0
  O  O26  1  0.781  0.264  0.249  1.0
  O  O27  1  0.219  0.264  0.751  1.0
  O  O28  1  0.781  0.264  0.751  1.0
  O  O29  1  0.219  0.264  0.249  1.0
  O  O30  1  0.000  0.478  0.644  1.0
  O  O31  1  0.000  0.478  0.356  1.0
  O  O32  1  0.000  0.480  0.140  1.0
  O  O33  1  0.000  0.480  0.860  1.0
  O  O34  1  0.500  0.522  0.856  1.0
  O  O35  1  0.500  0.520  0.360  1.0
  O  O36  1  0.500  0.522  0.144  1.0
  O  O37  1  0.500  0.520  0.640  1.0
  O  O38  1  0.281  0.736  0.251  1.0
  O  O39  1  0.719  0.736  0.749  1.0
  O  O40  1  0.281  0.736  0.749  1.0
  O  O41  1  0.719  0.736  0.251  1.0
  O  O42  1  0.288  0.774  0.500  1.0
  O  O43  1  0.284  0.765  0.000  1.0
  O  O44  1  0.716  0.765  0.000  1.0
  O  O45  1  0.712  0.774  0.500  1.0
  O  O46  1  0.500  0.985  0.892  1.0
  O  O47  1  0.500  0.985  0.108  1.0
  O  O48  1  0.500  0.989  0.609  1.0
  O  O49  1  0.500  0.989  0.391  1.0
[/CIF]
.
The material structure described by NaMn8O16 crystallizes in the orthorhombic Pmmn space group. Na(1) is bonded to two equivalent O(4) and two equivalent O(6) atoms to form NaO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(3)O6 octahedra, and corners with four equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 60-62°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share  a cornercorner with one Na(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Na(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the fourth Mn site, Mn(4) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Na(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a distorted T-shaped geometry to one Mn(3) and two equivalent Mn(4) atoms. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3) and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fifth O site, O(4) is bonded to one Na(1), one Mn(1), and two equivalent Mn(3) atoms to form a mixture of corner and edge-sharing ONaMn3 tetrahedra. In the sixth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the seventh O site, O(6) is bonded to one Na(1), one Mn(2), and two equivalent Mn(4) atoms to form corner-sharing ONaMn3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaMn8O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.924
_cell_length_b   8.380
_cell_length_c   11.858
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   588.708
_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  0.500  0.374  0.000  1.0
  Na  Na1  1  0.000  0.626  0.500  1.0
  Mn  Mn2  1  0.247  0.995  0.000  1.0
  Mn  Mn3  1  0.253  0.005  0.500  1.0
  Mn  Mn4  1  0.753  0.995  0.000  1.0
  Mn  Mn5  1  0.747  0.005  0.500  1.0
  Mn  Mn6  1  0.000  0.245  0.374  1.0
  Mn  Mn7  1  0.000  0.245  0.873  1.0
  Mn  Mn8  1  0.000  0.245  0.127  1.0
  Mn  Mn9  1  0.000  0.245  0.626  1.0
  Mn  Mn10  1  0.750  0.500  0.750  1.0
  Mn  Mn11  1  0.250  0.500  0.250  1.0
  Mn  Mn12  1  0.750  0.500  0.250  1.0
  Mn  Mn13  1  0.250  0.500  0.750  1.0
  Mn  Mn14  1  0.500  0.755  0.874  1.0
  Mn  Mn15  1  0.500  0.755  0.126  1.0
  Mn  Mn16  1  0.500  0.755  0.627  1.0
  Mn  Mn17  1  0.500  0.755  0.373  1.0
  O  O18  1  0.000  0.015  0.392  1.0
  O  O19  1  0.000  0.011  0.891  1.0
  O  O20  1  0.000  0.011  0.109  1.0
  O  O21  1  0.000  0.015  0.608  1.0
  O  O22  1  0.784  0.235  0.500  1.0
  O  O23  1  0.788  0.226  0.000  1.0
  O  O24  1  0.216  0.235  0.500  1.0
  O  O25  1  0.212  0.226  0.000  1.0
  O  O26  1  0.781  0.264  0.249  1.0
  O  O27  1  0.219  0.264  0.751  1.0
  O  O28  1  0.781  0.264  0.751  1.0
  O  O29  1  0.219  0.264  0.249  1.0
  O  O30  1  0.000  0.478  0.644  1.0
  O  O31  1  0.000  0.478  0.356  1.0
  O  O32  1  0.000  0.480  0.140  1.0
  O  O33  1  0.000  0.480  0.860  1.0
  O  O34  1  0.500  0.522  0.856  1.0
  O  O35  1  0.500  0.520  0.360  1.0
  O  O36  1  0.500  0.522  0.144  1.0
  O  O37  1  0.500  0.520  0.640  1.0
  O  O38  1  0.281  0.736  0.251  1.0
  O  O39  1  0.719  0.736  0.749  1.0
  O  O40  1  0.281  0.736  0.749  1.0
  O  O41  1  0.719  0.736  0.251  1.0
  O  O42  1  0.288  0.774  0.500  1.0
  O  O43  1  0.284  0.765  0.000  1.0
  O  O44  1  0.716  0.765  0.000  1.0
  O  O45  1  0.712  0.774  0.500  1.0
  O  O46  1  0.500  0.985  0.892  1.0
  O  O47  1  0.500  0.985  0.108  1.0
  O  O48  1  0.500  0.989  0.609  1.0
  O  O49  1  0.500  0.989  0.391  1.0
[/CIF]
.