The crystal structure described by Be2SiO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Be(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the third O site, O(1) is bonded in a trigonal planar geometry to two equivalent Be(2) and one Si(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Be2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.707
_cell_length_b   7.707
_cell_length_c   7.707
_cell_angle_alpha   108.007
_cell_angle_beta   108.007
_cell_angle_gamma   108.007
_symmetry_Int_Tables_number   1
_cell_volume   370.228
_cell_formula_units_Z   6
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  0.872  0.102  0.278  1.0
  Be  Be1  1  0.102  0.278  0.872  1.0
  Be  Be2  1  0.278  0.872  0.102  1.0
  Be  Be3  1  0.128  0.898  0.722  1.0
  Be  Be4  1  0.898  0.722  0.128  1.0
  Be  Be5  1  0.722  0.128  0.898  1.0
  Be  Be6  1  0.390  0.794  0.569  1.0
  Be  Be7  1  0.569  0.390  0.794  1.0
  Be  Be8  1  0.794  0.569  0.390  1.0
  Be  Be9  1  0.610  0.206  0.431  1.0
  Be  Be10  1  0.431  0.610  0.206  1.0
  Be  Be11  1  0.206  0.431  0.610  1.0
  Si  Si12  1  0.538  0.766  0.946  1.0
  Si  Si13  1  0.766  0.946  0.538  1.0
  Si  Si14  1  0.946  0.538  0.766  1.0
  Si  Si15  1  0.462  0.234  0.054  1.0
  Si  Si16  1  0.234  0.054  0.462  1.0
  Si  Si17  1  0.054  0.462  0.234  1.0
  O  O18  1  0.293  0.624  0.329  1.0
  O  O19  1  0.329  0.293  0.624  1.0
  O  O20  1  0.624  0.329  0.293  1.0
  O  O21  1  0.707  0.376  0.671  1.0
  O  O22  1  0.671  0.707  0.376  1.0
  O  O23  1  0.376  0.671  0.707  1.0
  O  O24  1  0.040  0.338  0.371  1.0
  O  O25  1  0.371  0.040  0.338  1.0
  O  O26  1  0.338  0.371  0.040  1.0
  O  O27  1  0.960  0.662  0.629  1.0
  O  O28  1  0.629  0.960  0.662  1.0
  O  O29  1  0.662  0.629  0.960  1.0
  O  O30  1  0.916  0.583  0.251  1.0
  O  O31  1  0.251  0.916  0.583  1.0
  O  O32  1  0.583  0.251  0.916  1.0
  O  O33  1  0.084  0.417  0.749  1.0
  O  O34  1  0.749  0.084  0.417  1.0
  O  O35  1  0.417  0.749  0.084  1.0
  O  O36  1  0.963  0.295  0.997  1.0
  O  O37  1  0.997  0.963  0.295  1.0
  O  O38  1  0.295  0.997  0.963  1.0
  O  O39  1  0.037  0.705  0.003  1.0
  O  O40  1  0.003  0.037  0.705  1.0
  O  O41  1  0.705  0.003  0.037  1.0
[/CIF]
.
The crystal structure described by Be2SiO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Be(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the third O site, O(1) is bonded in a trigonal planar geometry to two equivalent Be(2) and one Si(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Be2SiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.707
_cell_length_b   7.707
_cell_length_c   7.707
_cell_angle_alpha   108.007
_cell_angle_beta   108.007
_cell_angle_gamma   108.007
_symmetry_Int_Tables_number   1
_cell_volume   370.228
_cell_formula_units_Z   6
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  0.872  0.102  0.278  1.0
  Be  Be1  1  0.102  0.278  0.872  1.0
  Be  Be2  1  0.278  0.872  0.102  1.0
  Be  Be3  1  0.128  0.898  0.722  1.0
  Be  Be4  1  0.898  0.722  0.128  1.0
  Be  Be5  1  0.722  0.128  0.898  1.0
  Be  Be6  1  0.390  0.794  0.569  1.0
  Be  Be7  1  0.569  0.390  0.794  1.0
  Be  Be8  1  0.794  0.569  0.390  1.0
  Be  Be9  1  0.610  0.206  0.431  1.0
  Be  Be10  1  0.431  0.610  0.206  1.0
  Be  Be11  1  0.206  0.431  0.610  1.0
  Si  Si12  1  0.538  0.766  0.946  1.0
  Si  Si13  1  0.766  0.946  0.538  1.0
  Si  Si14  1  0.946  0.538  0.766  1.0
  Si  Si15  1  0.462  0.234  0.054  1.0
  Si  Si16  1  0.234  0.054  0.462  1.0
  Si  Si17  1  0.054  0.462  0.234  1.0
  O  O18  1  0.293  0.624  0.329  1.0
  O  O19  1  0.329  0.293  0.624  1.0
  O  O20  1  0.624  0.329  0.293  1.0
  O  O21  1  0.707  0.376  0.671  1.0
  O  O22  1  0.671  0.707  0.376  1.0
  O  O23  1  0.376  0.671  0.707  1.0
  O  O24  1  0.040  0.338  0.371  1.0
  O  O25  1  0.371  0.040  0.338  1.0
  O  O26  1  0.338  0.371  0.040  1.0
  O  O27  1  0.960  0.662  0.629  1.0
  O  O28  1  0.629  0.960  0.662  1.0
  O  O29  1  0.662  0.629  0.960  1.0
  O  O30  1  0.916  0.583  0.251  1.0
  O  O31  1  0.251  0.916  0.583  1.0
  O  O32  1  0.583  0.251  0.916  1.0
  O  O33  1  0.084  0.417  0.749  1.0
  O  O34  1  0.749  0.084  0.417  1.0
  O  O35  1  0.417  0.749  0.084  1.0
  O  O36  1  0.963  0.295  0.997  1.0
  O  O37  1  0.997  0.963  0.295  1.0
  O  O38  1  0.295  0.997  0.963  1.0
  O  O39  1  0.037  0.705  0.003  1.0
  O  O40  1  0.003  0.037  0.705  1.0
  O  O41  1  0.705  0.003  0.037  1.0
[/CIF]
.