The crystal structure described by Na2Be3Si3O8 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one Be(2), one O(1), one O(4), one O(6), and one O(7) atom. In the second Na site, Na(2) is bonded in a 1-coordinate geometry to one Be(2) and one O(5) atom. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded in a single-bond geometry to two equivalent Be(2) and one O(3) atom. In the second Be site, Be(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Be(2), and two equivalent Be(1) atoms. In the third Be site, Be(3) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Be(3), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(3) and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), one Be(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2), one Be(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Si(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_Na2Be3Si3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.233
_cell_length_b   8.233
_cell_length_c   9.708
_cell_angle_alpha   56.634
_cell_angle_beta   56.634
_cell_angle_gamma   70.596
_symmetry_Int_Tables_number   1
_cell_volume   458.592
_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  0.755  0.436  0.071  1.0
  Na  Na1  1  0.564  0.245  0.929  1.0
  Na  Na2  1  0.595  0.779  0.742  1.0
  Na  Na3  1  0.221  0.405  0.258  1.0
  Be  Be4  1  0.678  0.133  0.426  1.0
  Be  Be5  1  0.867  0.322  0.574  1.0
  Be  Be6  1  0.646  0.183  0.629  1.0
  Be  Be7  1  0.817  0.354  0.371  1.0
  Be  Be8  1  0.847  0.901  0.294  1.0
  Be  Be9  1  0.099  0.153  0.706  1.0
  Si  Si10  1  0.042  0.611  0.530  1.0
  Si  Si11  1  0.389  0.958  0.470  1.0
  Si  Si12  1  0.158  0.592  0.801  1.0
  Si  Si13  1  0.408  0.842  0.199  1.0
  Si  Si14  1  0.173  0.151  0.974  1.0
  Si  Si15  1  0.849  0.827  0.026  1.0
  O  O16  1  0.956  0.108  0.149  1.0
  O  O17  1  0.892  0.044  0.851  1.0
  O  O18  1  0.211  0.145  0.797  1.0
  O  O19  1  0.855  0.789  0.203  1.0
  O  O20  1  0.608  0.002  0.405  1.0
  O  O21  1  0.998  0.392  0.595  1.0
  O  O22  1  0.344  0.005  0.038  1.0
  O  O23  1  0.995  0.656  0.962  1.0
  O  O24  1  0.883  0.768  0.478  1.0
  O  O25  1  0.232  0.117  0.522  1.0
  O  O26  1  0.235  0.370  0.907  1.0
  O  O27  1  0.630  0.765  0.093  1.0
  O  O28  1  0.039  0.596  0.709  1.0
  O  O29  1  0.404  0.961  0.291  1.0
  O  O30  1  0.343  0.734  0.648  1.0
  O  O31  1  0.266  0.657  0.352  1.0
[/CIF]
.
The crystal structure described by Na2Be3Si3O8 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one Be(2), one O(1), one O(4), one O(6), and one O(7) atom. In the second Na site, Na(2) is bonded in a 1-coordinate geometry to one Be(2) and one O(5) atom. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded in a single-bond geometry to two equivalent Be(2) and one O(3) atom. In the second Be site, Be(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Be(2), and two equivalent Be(1) atoms. In the third Be site, Be(3) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Be(3)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Na(1), one Be(3), and one Si(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(3) and one Si(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), one Be(3), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(2), one Be(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Si(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_Na2Be3Si3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.233
_cell_length_b   8.233
_cell_length_c   9.708
_cell_angle_alpha   56.634
_cell_angle_beta   56.634
_cell_angle_gamma   70.596
_symmetry_Int_Tables_number   1
_cell_volume   458.592
_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  0.755  0.436  0.071  1.0
  Na  Na1  1  0.564  0.245  0.929  1.0
  Na  Na2  1  0.595  0.779  0.742  1.0
  Na  Na3  1  0.221  0.405  0.258  1.0
  Be  Be4  1  0.678  0.133  0.426  1.0
  Be  Be5  1  0.867  0.322  0.574  1.0
  Be  Be6  1  0.646  0.183  0.629  1.0
  Be  Be7  1  0.817  0.354  0.371  1.0
  Be  Be8  1  0.847  0.901  0.294  1.0
  Be  Be9  1  0.099  0.153  0.706  1.0
  Si  Si10  1  0.042  0.611  0.530  1.0
  Si  Si11  1  0.389  0.958  0.470  1.0
  Si  Si12  1  0.158  0.592  0.801  1.0
  Si  Si13  1  0.408  0.842  0.199  1.0
  Si  Si14  1  0.173  0.151  0.974  1.0
  Si  Si15  1  0.849  0.827  0.026  1.0
  O  O16  1  0.956  0.108  0.149  1.0
  O  O17  1  0.892  0.044  0.851  1.0
  O  O18  1  0.211  0.145  0.797  1.0
  O  O19  1  0.855  0.789  0.203  1.0
  O  O20  1  0.608  0.002  0.405  1.0
  O  O21  1  0.998  0.392  0.595  1.0
  O  O22  1  0.344  0.005  0.038  1.0
  O  O23  1  0.995  0.656  0.962  1.0
  O  O24  1  0.883  0.768  0.478  1.0
  O  O25  1  0.232  0.117  0.522  1.0
  O  O26  1  0.235  0.370  0.907  1.0
  O  O27  1  0.630  0.765  0.093  1.0
  O  O28  1  0.039  0.596  0.709  1.0
  O  O29  1  0.404  0.961  0.291  1.0
  O  O30  1  0.343  0.734  0.648  1.0
  O  O31  1  0.266  0.657  0.352  1.0
[/CIF]
.