The crystal structure described by Be3As2(H2O5)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra and corners with four equivalent As(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form BeO4 tetrahedra that share corners with two equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with four equivalent Be(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Be(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Be(2) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Be(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Be(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Be(2), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_Be3As2(H2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.669
_cell_length_b   8.669
_cell_length_c   10.047
_cell_angle_alpha   85.641
_cell_angle_beta   85.641
_cell_angle_gamma   31.821
_symmetry_Int_Tables_number   1
_cell_volume   396.836
_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
  Be  Be0  1  0.702  0.793  0.339  1.0
  Be  Be1  1  0.207  0.298  0.161  1.0
  Be  Be2  1  0.298  0.207  0.661  1.0
  Be  Be3  1  0.793  0.702  0.839  1.0
  Be  Be4  1  0.683  0.317  0.750  1.0
  Be  Be5  1  0.317  0.683  0.250  1.0
  As  As6  1  0.387  0.302  0.899  1.0
  As  As7  1  0.302  0.387  0.399  1.0
  As  As8  1  0.613  0.698  0.101  1.0
  As  As9  1  0.698  0.613  0.601  1.0
  H  H10  1  0.907  0.278  0.896  1.0
  H  H11  1  0.956  0.147  0.338  1.0
  H  H12  1  0.853  0.044  0.162  1.0
  H  H13  1  0.044  0.853  0.662  1.0
  H  H14  1  0.147  0.956  0.838  1.0
  H  H15  1  0.278  0.907  0.396  1.0
  H  H16  1  0.093  0.722  0.104  1.0
  H  H17  1  0.722  0.093  0.604  1.0
  O  O18  1  0.248  0.421  0.058  1.0
  O  O19  1  0.421  0.248  0.558  1.0
  O  O20  1  0.752  0.579  0.942  1.0
  O  O21  1  0.579  0.752  0.442  1.0
  O  O22  1  0.590  0.532  0.169  1.0
  O  O23  1  0.289  0.069  0.102  1.0
  O  O24  1  0.410  0.468  0.831  1.0
  O  O25  1  0.532  0.590  0.669  1.0
  O  O26  1  0.848  0.597  0.202  1.0
  O  O27  1  0.403  0.152  0.298  1.0
  O  O28  1  0.152  0.403  0.798  1.0
  O  O29  1  0.597  0.848  0.702  1.0
  O  O30  1  0.468  0.410  0.331  1.0
  O  O31  1  0.931  0.711  0.398  1.0
  O  O32  1  0.711  0.931  0.898  1.0
  O  O33  1  0.069  0.289  0.602  1.0
  O  O34  1  0.849  0.061  0.646  1.0
  O  O35  1  0.061  0.849  0.146  1.0
  O  O36  1  0.151  0.939  0.354  1.0
  O  O37  1  0.939  0.151  0.854  1.0
[/CIF]
.
The crystal structure described by Be3As2(H2O5)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra and corners with four equivalent As(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to two equivalent O(2) and two equivalent O(5) atoms to form BeO4 tetrahedra that share corners with two equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with four equivalent Be(1)O4 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Be(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Be(2) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Be(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Be(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Be(2), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_Be3As2(H2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.669
_cell_length_b   8.669
_cell_length_c   10.047
_cell_angle_alpha   85.641
_cell_angle_beta   85.641
_cell_angle_gamma   31.821
_symmetry_Int_Tables_number   1
_cell_volume   396.836
_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
  Be  Be0  1  0.702  0.793  0.339  1.0
  Be  Be1  1  0.207  0.298  0.161  1.0
  Be  Be2  1  0.298  0.207  0.661  1.0
  Be  Be3  1  0.793  0.702  0.839  1.0
  Be  Be4  1  0.683  0.317  0.750  1.0
  Be  Be5  1  0.317  0.683  0.250  1.0
  As  As6  1  0.387  0.302  0.899  1.0
  As  As7  1  0.302  0.387  0.399  1.0
  As  As8  1  0.613  0.698  0.101  1.0
  As  As9  1  0.698  0.613  0.601  1.0
  H  H10  1  0.907  0.278  0.896  1.0
  H  H11  1  0.956  0.147  0.338  1.0
  H  H12  1  0.853  0.044  0.162  1.0
  H  H13  1  0.044  0.853  0.662  1.0
  H  H14  1  0.147  0.956  0.838  1.0
  H  H15  1  0.278  0.907  0.396  1.0
  H  H16  1  0.093  0.722  0.104  1.0
  H  H17  1  0.722  0.093  0.604  1.0
  O  O18  1  0.248  0.421  0.058  1.0
  O  O19  1  0.421  0.248  0.558  1.0
  O  O20  1  0.752  0.579  0.942  1.0
  O  O21  1  0.579  0.752  0.442  1.0
  O  O22  1  0.590  0.532  0.169  1.0
  O  O23  1  0.289  0.069  0.102  1.0
  O  O24  1  0.410  0.468  0.831  1.0
  O  O25  1  0.532  0.590  0.669  1.0
  O  O26  1  0.848  0.597  0.202  1.0
  O  O27  1  0.403  0.152  0.298  1.0
  O  O28  1  0.152  0.403  0.798  1.0
  O  O29  1  0.597  0.848  0.702  1.0
  O  O30  1  0.468  0.410  0.331  1.0
  O  O31  1  0.931  0.711  0.398  1.0
  O  O32  1  0.711  0.931  0.898  1.0
  O  O33  1  0.069  0.289  0.602  1.0
  O  O34  1  0.849  0.061  0.646  1.0
  O  O35  1  0.061  0.849  0.146  1.0
  O  O36  1  0.151  0.939  0.354  1.0
  O  O37  1  0.939  0.151  0.854  1.0
[/CIF]
.