The crystal structure described by Na8Cu5O10 crystallizes in the monoclinic Cm space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one O(6) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(5), and two equivalent O(3) atoms. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(6), and two equivalent O(4) atoms. In the fifth Na site, Na(5) is bonded in a distorted trigonal bipyramidal geometry to one O(5), two equivalent O(3), and two equivalent O(6) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(6) atoms. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Na(3), one Na(5), two equivalent Na(2), and two equivalent Cu(2) atoms to form ONa4Cu2 octahedra that share corners with four equivalent O(1)Na3Cu2 trigonal bipyramids, edges with two equivalent O(6)Na4Cu2 octahedra, and edges with two equivalent O(4)Na3Cu2 trigonal bipyramids. In the second O site, O(6) is bonded to one Na(1), one Na(2), one Na(4), one Na(5), one Cu(1), and one Cu(3) atom to form distorted ONa4Cu2 octahedra that share corners with two equivalent O(1)Na3Cu2 trigonal bipyramids, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids,  an edgeedge with one O(5)Na4Cu2 octahedra,  an edgeedge with one O(6)Na4Cu2 octahedra,  an edgeedge with one O(1)Na3Cu2 trigonal bipyramid, and  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid. In the third O site, O(1) is bonded to one Na(1), one Na(2), one Na(4), one Cu(1), and one Cu(2) atom to form ONa3Cu2 trigonal bipyramids that share corners with two equivalent O(5)Na4Cu2 octahedra, corners with two equivalent O(6)Na4Cu2 octahedra,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid,  an edgeedge with one O(6)Na4Cu2 octahedra, and edges with two equivalent O(4)Na3Cu2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-52°. In the fourth O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), two equivalent Na(1), two equivalent Na(2), and two equivalent Cu(2) atoms. In the fifth O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Na(5), one Cu(1), and one Cu(3) atom. In the sixth O site, O(4) is bonded to one Na(2), two equivalent Na(4), one Cu(1), and one Cu(2) atom to form distorted ONa3Cu2 trigonal bipyramids that share corners with two equivalent O(6)Na4Cu2 octahedra,  a cornercorner with one O(1)Na3Cu2 trigonal bipyramid, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids,  an edgeedge with one O(5)Na4Cu2 octahedra,  an edgeedge with one O(6)Na4Cu2 octahedra, and edges with two equivalent O(1)Na3Cu2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-56°. is represented by the CIF file [CIF]
data_Na8(CuO2)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.645
_cell_length_b   8.070
_cell_length_c   8.070
_cell_angle_alpha   119.053
_cell_angle_beta   100.865
_cell_angle_gamma   100.865
_symmetry_Int_Tables_number   1
_cell_volume   298.345
_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  0.399  0.266  0.541  1.0
  Na  Na1  1  0.364  0.735  0.956  1.0
  Na  Na2  1  0.090  0.519  0.519  1.0
  Na  Na3  1  0.144  0.858  0.297  1.0
  Na  Na4  1  0.399  0.541  0.266  1.0
  Na  Na5  1  0.364  0.956  0.735  1.0
  Na  Na6  1  0.144  0.297  0.858  1.0
  Na  Na7  1  0.148  0.090  0.090  1.0
  Cu  Cu8  1  0.751  0.019  0.417  1.0
  Cu  Cu9  1  0.780  0.628  0.827  1.0
  Cu  Cu10  1  0.780  0.827  0.628  1.0
  Cu  Cu11  1  0.721  0.196  0.196  1.0
  Cu  Cu12  1  0.751  0.417  0.019  1.0
  O  O13  1  0.528  0.479  0.879  1.0
  O  O14  1  0.526  0.654  0.654  1.0
  O  O15  1  0.979  0.156  0.355  1.0
  O  O16  1  0.979  0.355  0.156  1.0
  O  O17  1  0.007  0.570  0.989  1.0
  O  O18  1  0.528  0.879  0.479  1.0
  O  O19  1  0.032  0.784  0.784  1.0
  O  O20  1  0.491  0.046  0.261  1.0
  O  O21  1  0.007  0.989  0.570  1.0
  O  O22  1  0.491  0.261  0.046  1.0
[/CIF]
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The crystal structure described by Na8Cu5O10 crystallizes in the monoclinic Cm space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), one O(3), and one O(6) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(5), and two equivalent O(3) atoms. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(6), and two equivalent O(4) atoms. In the fifth Na site, Na(5) is bonded in a distorted trigonal bipyramidal geometry to one O(5), two equivalent O(3), and two equivalent O(6) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(6) atoms. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Na(3), one Na(5), two equivalent Na(2), and two equivalent Cu(2) atoms to form ONa4Cu2 octahedra that share corners with four equivalent O(1)Na3Cu2 trigonal bipyramids, edges with two equivalent O(6)Na4Cu2 octahedra, and edges with two equivalent O(4)Na3Cu2 trigonal bipyramids. In the second O site, O(6) is bonded to one Na(1), one Na(2), one Na(4), one Na(5), one Cu(1), and one Cu(3) atom to form distorted ONa4Cu2 octahedra that share corners with two equivalent O(1)Na3Cu2 trigonal bipyramids, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids,  an edgeedge with one O(5)Na4Cu2 octahedra,  an edgeedge with one O(6)Na4Cu2 octahedra,  an edgeedge with one O(1)Na3Cu2 trigonal bipyramid, and  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid. In the third O site, O(1) is bonded to one Na(1), one Na(2), one Na(4), one Cu(1), and one Cu(2) atom to form ONa3Cu2 trigonal bipyramids that share corners with two equivalent O(5)Na4Cu2 octahedra, corners with two equivalent O(6)Na4Cu2 octahedra,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid,  an edgeedge with one O(6)Na4Cu2 octahedra, and edges with two equivalent O(4)Na3Cu2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-52°. In the fourth O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), two equivalent Na(1), two equivalent Na(2), and two equivalent Cu(2) atoms. In the fifth O site, O(3) is bonded in a 6-coordinate geometry to one Na(1), one Na(3), one Na(4), one Na(5), one Cu(1), and one Cu(3) atom. In the sixth O site, O(4) is bonded to one Na(2), two equivalent Na(4), one Cu(1), and one Cu(2) atom to form distorted ONa3Cu2 trigonal bipyramids that share corners with two equivalent O(6)Na4Cu2 octahedra,  a cornercorner with one O(1)Na3Cu2 trigonal bipyramid, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids,  an edgeedge with one O(5)Na4Cu2 octahedra,  an edgeedge with one O(6)Na4Cu2 octahedra, and edges with two equivalent O(1)Na3Cu2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 1-56°. is represented by the CIF file [CIF]
data_Na8(CuO2)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.645
_cell_length_b   8.070
_cell_length_c   8.070
_cell_angle_alpha   119.053
_cell_angle_beta   100.865
_cell_angle_gamma   100.865
_symmetry_Int_Tables_number   1
_cell_volume   298.345
_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  0.399  0.266  0.541  1.0
  Na  Na1  1  0.364  0.735  0.956  1.0
  Na  Na2  1  0.090  0.519  0.519  1.0
  Na  Na3  1  0.144  0.858  0.297  1.0
  Na  Na4  1  0.399  0.541  0.266  1.0
  Na  Na5  1  0.364  0.956  0.735  1.0
  Na  Na6  1  0.144  0.297  0.858  1.0
  Na  Na7  1  0.148  0.090  0.090  1.0
  Cu  Cu8  1  0.751  0.019  0.417  1.0
  Cu  Cu9  1  0.780  0.628  0.827  1.0
  Cu  Cu10  1  0.780  0.827  0.628  1.0
  Cu  Cu11  1  0.721  0.196  0.196  1.0
  Cu  Cu12  1  0.751  0.417  0.019  1.0
  O  O13  1  0.528  0.479  0.879  1.0
  O  O14  1  0.526  0.654  0.654  1.0
  O  O15  1  0.979  0.156  0.355  1.0
  O  O16  1  0.979  0.355  0.156  1.0
  O  O17  1  0.007  0.570  0.989  1.0
  O  O18  1  0.528  0.879  0.479  1.0
  O  O19  1  0.032  0.784  0.784  1.0
  O  O20  1  0.491  0.046  0.261  1.0
  O  O21  1  0.007  0.989  0.570  1.0
  O  O22  1  0.491  0.261  0.046  1.0
[/CIF]
.