The crystal structure described by NaBSi2O5(OH)2 crystallizes in the monoclinic P2_1 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(6), and two equivalent O(7) atoms. B(1) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(7) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one B(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one H(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Na(1) and one B(1) atom. is represented by the CIF card [CIF]
data_NaSi2BH2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.075
_cell_length_b   5.298
_cell_length_c   8.459
_cell_angle_alpha   88.862
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   316.995
_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  0.420  0.122  0.453  1.0
  Na  Na1  1  0.920  0.878  0.547  1.0
  Si  Si2  1  0.099  0.223  0.133  1.0
  Si  Si3  1  0.599  0.777  0.867  1.0
  Si  Si4  1  0.531  0.270  0.071  1.0
  Si  Si5  1  0.031  0.730  0.929  1.0
  B  B6  1  0.805  0.252  0.339  1.0
  B  B7  1  0.305  0.748  0.661  1.0
  H  H8  1  0.653  0.802  0.269  1.0
  H  H9  1  0.153  0.198  0.731  1.0
  H  H10  1  0.138  0.388  0.585  1.0
  H  H11  1  0.638  0.612  0.415  1.0
  O  O12  1  0.328  0.238  0.165  1.0
  O  O13  1  0.828  0.762  0.835  1.0
  O  O14  1  0.046  0.945  0.064  1.0
  O  O15  1  0.546  0.055  0.936  1.0
  O  O16  1  0.693  0.218  0.199  1.0
  O  O17  1  0.193  0.782  0.801  1.0
  O  O18  1  0.002  0.258  0.305  1.0
  O  O19  1  0.502  0.742  0.695  1.0
  O  O20  1  0.541  0.555  0.996  1.0
  O  O21  1  0.041  0.445  0.004  1.0
  O  O22  1  0.725  0.717  0.352  1.0
  O  O23  1  0.225  0.283  0.648  1.0
  O  O24  1  0.236  0.757  0.517  1.0
  O  O25  1  0.736  0.243  0.483  1.0
[/CIF]
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The crystal structure described by NaBSi2O5(OH)2 crystallizes in the monoclinic P2_1 space group. Na(1) is bonded in a 4-coordinate geometry to one O(1), one O(6), and two equivalent O(7) atoms. B(1) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(7) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing SiO4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one B(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Na(1), one H(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Na(1) and one B(1) atom. is represented by the CIF card [CIF]
data_NaSi2BH2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.075
_cell_length_b   5.298
_cell_length_c   8.459
_cell_angle_alpha   88.862
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   316.995
_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  0.420  0.122  0.453  1.0
  Na  Na1  1  0.920  0.878  0.547  1.0
  Si  Si2  1  0.099  0.223  0.133  1.0
  Si  Si3  1  0.599  0.777  0.867  1.0
  Si  Si4  1  0.531  0.270  0.071  1.0
  Si  Si5  1  0.031  0.730  0.929  1.0
  B  B6  1  0.805  0.252  0.339  1.0
  B  B7  1  0.305  0.748  0.661  1.0
  H  H8  1  0.653  0.802  0.269  1.0
  H  H9  1  0.153  0.198  0.731  1.0
  H  H10  1  0.138  0.388  0.585  1.0
  H  H11  1  0.638  0.612  0.415  1.0
  O  O12  1  0.328  0.238  0.165  1.0
  O  O13  1  0.828  0.762  0.835  1.0
  O  O14  1  0.046  0.945  0.064  1.0
  O  O15  1  0.546  0.055  0.936  1.0
  O  O16  1  0.693  0.218  0.199  1.0
  O  O17  1  0.193  0.782  0.801  1.0
  O  O18  1  0.002  0.258  0.305  1.0
  O  O19  1  0.502  0.742  0.695  1.0
  O  O20  1  0.541  0.555  0.996  1.0
  O  O21  1  0.041  0.445  0.004  1.0
  O  O22  1  0.725  0.717  0.352  1.0
  O  O23  1  0.225  0.283  0.648  1.0
  O  O24  1  0.236  0.757  0.517  1.0
  O  O25  1  0.736  0.243  0.483  1.0
[/CIF]
.