The structure described by V2SiO7 crystallizes in the cubic Pa-3 space group. V(1) is bonded to one O(1) and three equivalent O(2) atoms to form VO4 tetrahedra that share corners with three equivalent Si(1)O6 octahedra and  a cornercorner with one V(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 19°. Si(1) is bonded to six equivalent O(2) atoms to form SiO6 octahedra that share corners with six equivalent V(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent V(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom. is represented by the CIF file [CIF]
data_V2SiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.324
_cell_length_b   8.324
_cell_length_c   8.324
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   576.751
_cell_formula_units_Z   4
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
  V  V0  1  0.123  0.877  0.377  1.0
  V  V1  1  0.123  0.623  0.877  1.0
  V  V2  1  0.377  0.377  0.377  1.0
  V  V3  1  0.377  0.123  0.877  1.0
  V  V4  1  0.623  0.623  0.623  1.0
  V  V5  1  0.623  0.877  0.123  1.0
  V  V6  1  0.877  0.123  0.623  1.0
  V  V7  1  0.877  0.377  0.123  1.0
  Si  Si8  1  0.000  0.000  0.000  1.0
  Si  Si9  1  0.000  0.500  0.500  1.0
  Si  Si10  1  0.500  0.000  0.500  1.0
  Si  Si11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.000  0.000  0.500  1.0
  O  O13  1  0.000  0.500  0.000  1.0
  O  O14  1  0.062  0.681  0.405  1.0
  O  O15  1  0.062  0.819  0.905  1.0
  O  O16  1  0.095  0.562  0.681  1.0
  O  O17  1  0.095  0.938  0.181  1.0
  O  O18  1  0.181  0.095  0.938  1.0
  O  O19  1  0.181  0.405  0.438  1.0
  O  O20  1  0.319  0.595  0.938  1.0
  O  O21  1  0.319  0.905  0.438  1.0
  O  O22  1  0.405  0.062  0.681  1.0
  O  O23  1  0.405  0.438  0.181  1.0
  O  O24  1  0.438  0.319  0.905  1.0
  O  O25  1  0.438  0.181  0.405  1.0
  O  O26  1  0.500  0.500  0.500  1.0
  O  O27  1  0.500  0.000  0.000  1.0
  O  O28  1  0.562  0.681  0.095  1.0
  O  O29  1  0.562  0.819  0.595  1.0
  O  O30  1  0.595  0.562  0.819  1.0
  O  O31  1  0.595  0.938  0.319  1.0
  O  O32  1  0.681  0.095  0.562  1.0
  O  O33  1  0.681  0.405  0.062  1.0
  O  O34  1  0.819  0.595  0.562  1.0
  O  O35  1  0.819  0.905  0.062  1.0
  O  O36  1  0.905  0.062  0.819  1.0
  O  O37  1  0.905  0.438  0.319  1.0
  O  O38  1  0.938  0.181  0.095  1.0
  O  O39  1  0.938  0.319  0.595  1.0
[/CIF]
.
The structure described by V2SiO7 crystallizes in the cubic Pa-3 space group. V(1) is bonded to one O(1) and three equivalent O(2) atoms to form VO4 tetrahedra that share corners with three equivalent Si(1)O6 octahedra and  a cornercorner with one V(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 19°. Si(1) is bonded to six equivalent O(2) atoms to form SiO6 octahedra that share corners with six equivalent V(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent V(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one V(1) and one Si(1) atom. is represented by the CIF file [CIF]
data_V2SiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.324
_cell_length_b   8.324
_cell_length_c   8.324
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   576.751
_cell_formula_units_Z   4
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
  V  V0  1  0.123  0.877  0.377  1.0
  V  V1  1  0.123  0.623  0.877  1.0
  V  V2  1  0.377  0.377  0.377  1.0
  V  V3  1  0.377  0.123  0.877  1.0
  V  V4  1  0.623  0.623  0.623  1.0
  V  V5  1  0.623  0.877  0.123  1.0
  V  V6  1  0.877  0.123  0.623  1.0
  V  V7  1  0.877  0.377  0.123  1.0
  Si  Si8  1  0.000  0.000  0.000  1.0
  Si  Si9  1  0.000  0.500  0.500  1.0
  Si  Si10  1  0.500  0.000  0.500  1.0
  Si  Si11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.000  0.000  0.500  1.0
  O  O13  1  0.000  0.500  0.000  1.0
  O  O14  1  0.062  0.681  0.405  1.0
  O  O15  1  0.062  0.819  0.905  1.0
  O  O16  1  0.095  0.562  0.681  1.0
  O  O17  1  0.095  0.938  0.181  1.0
  O  O18  1  0.181  0.095  0.938  1.0
  O  O19  1  0.181  0.405  0.438  1.0
  O  O20  1  0.319  0.595  0.938  1.0
  O  O21  1  0.319  0.905  0.438  1.0
  O  O22  1  0.405  0.062  0.681  1.0
  O  O23  1  0.405  0.438  0.181  1.0
  O  O24  1  0.438  0.319  0.905  1.0
  O  O25  1  0.438  0.181  0.405  1.0
  O  O26  1  0.500  0.500  0.500  1.0
  O  O27  1  0.500  0.000  0.000  1.0
  O  O28  1  0.562  0.681  0.095  1.0
  O  O29  1  0.562  0.819  0.595  1.0
  O  O30  1  0.595  0.562  0.819  1.0
  O  O31  1  0.595  0.938  0.319  1.0
  O  O32  1  0.681  0.095  0.562  1.0
  O  O33  1  0.681  0.405  0.062  1.0
  O  O34  1  0.819  0.595  0.562  1.0
  O  O35  1  0.819  0.905  0.062  1.0
  O  O36  1  0.905  0.062  0.819  1.0
  O  O37  1  0.905  0.438  0.319  1.0
  O  O38  1  0.938  0.181  0.095  1.0
  O  O39  1  0.938  0.319  0.595  1.0
[/CIF]
.