The material described by Na3BiH8O7 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one H(2), one H(3), one O(1), one O(2), one O(3), one O(7), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one H(1), one H(3), one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms. In the third Na site, Na(3) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form NaO6 octahedra that share  an edgeedge with one Na(3)O6 octahedra and edges with three equivalent Bi(1)O5 square pyramids. Bi(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted BiO5 square pyramids that share edges with three equivalent Na(3)O6 octahedra and  an edgeedge with one Bi(1)O5 square pyramid. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Na(2) and one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Na(1) and one O(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Na(1), one Na(2), and one O(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(5) atom. In the fifth H site, H(5) is bonded in a linear geometry to one O(5) and one O(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(6) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), two equivalent Na(3), one Bi(1), and one H(1) atom. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Na(3), and two equivalent Bi(1) atoms to form edge-sharing ONa3Bi2 trigonal bipyramids. In the third O site, O(3) is bonded in a single-bond geometry to one Na(1), one Na(3), two equivalent Na(2), one Bi(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Na(2), one Na(3), two equivalent Na(1), one Bi(1), and one H(3) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(3), one H(4), and one H(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(2), one H(5), and one H(6) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Na(1), one H(7), and one H(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3BiH8O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.921
_cell_length_b   7.524
_cell_length_c   8.458
_cell_angle_alpha   94.563
_cell_angle_beta   89.323
_cell_angle_gamma   115.509
_symmetry_Int_Tables_number   1
_cell_volume   396.112
_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  0.798  0.876  0.375  1.0
  Na  Na1  1  0.202  0.124  0.625  1.0
  Na  Na2  1  0.689  0.148  0.640  1.0
  Na  Na3  1  0.311  0.852  0.360  1.0
  Na  Na4  1  0.053  0.367  0.364  1.0
  Na  Na5  1  0.947  0.633  0.636  1.0
  Bi  Bi6  1  0.544  0.379  0.328  1.0
  Bi  Bi7  1  0.456  0.621  0.672  1.0
  H  H8  1  0.040  0.354  0.756  1.0
  H  H9  1  0.960  0.646  0.244  1.0
  H  H10  1  0.675  0.084  0.233  1.0
  H  H11  1  0.325  0.916  0.767  1.0
  H  H12  1  0.849  0.944  0.760  1.0
  H  H13  1  0.151  0.056  0.240  1.0
  H  H14  1  0.184  0.537  0.081  1.0
  H  H15  1  0.816  0.463  0.919  1.0
  H  H16  1  0.992  0.324  0.030  1.0
  H  H17  1  0.008  0.676  0.970  1.0
  H  H18  1  0.647  0.189  0.961  1.0
  H  H19  1  0.353  0.811  0.039  1.0
  H  H20  1  0.767  0.748  0.025  1.0
  H  H21  1  0.233  0.252  0.975  1.0
  H  H22  1  0.780  0.965  0.021  1.0
  H  H23  1  0.220  0.035  0.979  1.0
  O  O24  1  0.091  0.388  0.649  1.0
  O  O25  1  0.909  0.612  0.351  1.0
  O  O26  1  0.566  0.381  0.577  1.0
  O  O27  1  0.434  0.619  0.423  1.0
  O  O28  1  0.670  0.130  0.344  1.0
  O  O29  1  0.330  0.870  0.656  1.0
  O  O30  1  0.815  0.885  0.650  1.0
  O  O31  1  0.185  0.115  0.350  1.0
  O  O32  1  0.141  0.393  0.087  1.0
  O  O33  1  0.859  0.607  0.913  1.0
  O  O34  1  0.788  0.209  0.922  1.0
  O  O35  1  0.212  0.791  0.078  1.0
  O  O36  1  0.745  0.856  0.090  1.0
  O  O37  1  0.255  0.144  0.910  1.0
[/CIF]
.
The material described by Na3BiH8O7 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one H(2), one H(3), one O(1), one O(2), one O(3), one O(7), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one H(1), one H(3), one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms. In the third Na site, Na(3) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form NaO6 octahedra that share  an edgeedge with one Na(3)O6 octahedra and edges with three equivalent Bi(1)O5 square pyramids. Bi(1) is bonded to one O(1), one O(3), one O(4), and two equivalent O(2) atoms to form distorted BiO5 square pyramids that share edges with three equivalent Na(3)O6 octahedra and  an edgeedge with one Bi(1)O5 square pyramid. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Na(2) and one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one Na(1) and one O(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Na(1), one Na(2), and one O(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(5) atom. In the fifth H site, H(5) is bonded in a linear geometry to one O(5) and one O(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(6) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), two equivalent Na(3), one Bi(1), and one H(1) atom. In the second O site, O(2) is bonded to one Na(1), one Na(2), one Na(3), and two equivalent Bi(1) atoms to form edge-sharing ONa3Bi2 trigonal bipyramids. In the third O site, O(3) is bonded in a single-bond geometry to one Na(1), one Na(3), two equivalent Na(2), one Bi(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Na(2), one Na(3), two equivalent Na(1), one Bi(1), and one H(3) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Na(3), one H(4), and one H(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(2), one H(5), and one H(6) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Na(1), one H(7), and one H(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3BiH8O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.921
_cell_length_b   7.524
_cell_length_c   8.458
_cell_angle_alpha   94.563
_cell_angle_beta   89.323
_cell_angle_gamma   115.509
_symmetry_Int_Tables_number   1
_cell_volume   396.112
_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  0.798  0.876  0.375  1.0
  Na  Na1  1  0.202  0.124  0.625  1.0
  Na  Na2  1  0.689  0.148  0.640  1.0
  Na  Na3  1  0.311  0.852  0.360  1.0
  Na  Na4  1  0.053  0.367  0.364  1.0
  Na  Na5  1  0.947  0.633  0.636  1.0
  Bi  Bi6  1  0.544  0.379  0.328  1.0
  Bi  Bi7  1  0.456  0.621  0.672  1.0
  H  H8  1  0.040  0.354  0.756  1.0
  H  H9  1  0.960  0.646  0.244  1.0
  H  H10  1  0.675  0.084  0.233  1.0
  H  H11  1  0.325  0.916  0.767  1.0
  H  H12  1  0.849  0.944  0.760  1.0
  H  H13  1  0.151  0.056  0.240  1.0
  H  H14  1  0.184  0.537  0.081  1.0
  H  H15  1  0.816  0.463  0.919  1.0
  H  H16  1  0.992  0.324  0.030  1.0
  H  H17  1  0.008  0.676  0.970  1.0
  H  H18  1  0.647  0.189  0.961  1.0
  H  H19  1  0.353  0.811  0.039  1.0
  H  H20  1  0.767  0.748  0.025  1.0
  H  H21  1  0.233  0.252  0.975  1.0
  H  H22  1  0.780  0.965  0.021  1.0
  H  H23  1  0.220  0.035  0.979  1.0
  O  O24  1  0.091  0.388  0.649  1.0
  O  O25  1  0.909  0.612  0.351  1.0
  O  O26  1  0.566  0.381  0.577  1.0
  O  O27  1  0.434  0.619  0.423  1.0
  O  O28  1  0.670  0.130  0.344  1.0
  O  O29  1  0.330  0.870  0.656  1.0
  O  O30  1  0.815  0.885  0.650  1.0
  O  O31  1  0.185  0.115  0.350  1.0
  O  O32  1  0.141  0.393  0.087  1.0
  O  O33  1  0.859  0.607  0.913  1.0
  O  O34  1  0.788  0.209  0.922  1.0
  O  O35  1  0.212  0.791  0.078  1.0
  O  O36  1  0.745  0.856  0.090  1.0
  O  O37  1  0.255  0.144  0.910  1.0
[/CIF]
.