The material structure described by W3O8 crystallizes in the monoclinic Cm space group. There are six inequivalent W sites. In the first W site, W(1) is bonded to one O(2), one O(4), one O(6), one O(7), one O(9), and two equivalent O(13) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(3)O7 pentagonal bipyramid, corners with two equivalent W(2)O7 pentagonal bipyramids,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(3)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 45°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(3), one O(5), one O(8), and two equivalent O(13) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(4)O7 pentagonal bipyramid, corners with two equivalent W(1)O7 pentagonal bipyramids,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(3)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 43-44°. In the third W site, W(3) is bonded to one O(2), one O(4), one O(5), one O(8), one O(9), and two equivalent O(12) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid, corners with two equivalent W(4)O7 pentagonal bipyramids,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 42°. In the fourth W site, W(4) is bonded to one O(1), one O(10), one O(3), one O(6), one O(7), and two equivalent O(12) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(2)O7 pentagonal bipyramid, corners with two equivalent W(3)O7 pentagonal bipyramids,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 43°. In the fifth W site, W(5) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(11) atoms to form WO6 octahedra that share corners with two equivalent W(6)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid,  a cornercorner with one W(2)O7 pentagonal bipyramid,  a cornercorner with one W(3)O7 pentagonal bipyramid,  a cornercorner with one W(4)O7 pentagonal bipyramid,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. In the sixth W site, W(6) is bonded to one O(2), one O(3), one O(5), one O(8), and two equivalent O(11) atoms to form WO6 octahedra that share corners with two equivalent W(5)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid,  a cornercorner with one W(2)O7 pentagonal bipyramid,  a cornercorner with one W(3)O7 pentagonal bipyramid,  a cornercorner with one W(4)O7 pentagonal bipyramid,  an edgeedge with one W(2)O7 pentagonal bipyramid, and  an edgeedge with one W(3)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one W(2), one W(4), and one W(5) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one W(1), one W(3), and one W(6) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(2), one W(4), and one W(6) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one W(1), one W(3), and one W(5) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(2), one W(3), and one W(6) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one W(2), one W(3), and one W(6) atom. In the ninth O site, O(9) is bonded in a linear geometry to one W(1) and one W(3) atom. In the tenth O site, O(10) is bonded in a linear geometry to one W(2) and one W(4) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(5) and one W(6) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one W(3) and one W(4) atom. In the thirteenth O site, O(13) is bonded in a linear geometry to one W(1) and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_W3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.869
_cell_length_b   6.260
_cell_length_c   6.260
_cell_angle_alpha   117.430
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   134.572
_cell_formula_units_Z   1
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
  O  O0  1  0.000  0.666  0.967  1.0
  O  O1  1  1.000  0.339  0.037  1.0
  O  O2  1  1.000  0.963  0.661  1.0
  O  O3  1  0.000  0.033  0.334  1.0
  O  O4  1  0.000  0.497  0.503  1.0
  O  O5  1  0.500  0.001  0.999  1.0
  O  O6  1  0.500  0.689  0.311  1.0
  O  O7  1  0.500  0.309  0.691  1.0
  W  W8  1  1.000  0.318  0.682  1.0
  W  W9  1  1.000  0.686  0.314  1.0
  W  W10  1  1.000  1.000  0.000  1.0
[/CIF]
.
The material structure described by W3O8 crystallizes in the monoclinic Cm space group. There are six inequivalent W sites. In the first W site, W(1) is bonded to one O(2), one O(4), one O(6), one O(7), one O(9), and two equivalent O(13) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(3)O7 pentagonal bipyramid, corners with two equivalent W(2)O7 pentagonal bipyramids,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(3)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 45°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(3), one O(5), one O(8), and two equivalent O(13) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(4)O7 pentagonal bipyramid, corners with two equivalent W(1)O7 pentagonal bipyramids,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(3)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 43-44°. In the third W site, W(3) is bonded to one O(2), one O(4), one O(5), one O(8), one O(9), and two equivalent O(12) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid, corners with two equivalent W(4)O7 pentagonal bipyramids,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 42°. In the fourth W site, W(4) is bonded to one O(1), one O(10), one O(3), one O(6), one O(7), and two equivalent O(12) atoms to form WO7 pentagonal bipyramids that share  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(2)O7 pentagonal bipyramid, corners with two equivalent W(3)O7 pentagonal bipyramids,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 43°. In the fifth W site, W(5) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(11) atoms to form WO6 octahedra that share corners with two equivalent W(6)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid,  a cornercorner with one W(2)O7 pentagonal bipyramid,  a cornercorner with one W(3)O7 pentagonal bipyramid,  a cornercorner with one W(4)O7 pentagonal bipyramid,  an edgeedge with one W(1)O7 pentagonal bipyramid, and  an edgeedge with one W(4)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. In the sixth W site, W(6) is bonded to one O(2), one O(3), one O(5), one O(8), and two equivalent O(11) atoms to form WO6 octahedra that share corners with two equivalent W(5)O6 octahedra,  a cornercorner with one W(1)O7 pentagonal bipyramid,  a cornercorner with one W(2)O7 pentagonal bipyramid,  a cornercorner with one W(3)O7 pentagonal bipyramid,  a cornercorner with one W(4)O7 pentagonal bipyramid,  an edgeedge with one W(2)O7 pentagonal bipyramid, and  an edgeedge with one W(3)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one W(2), one W(4), and one W(5) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one W(1), one W(3), and one W(6) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one W(2), one W(4), and one W(6) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one W(1), one W(3), and one W(5) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one W(2), one W(3), and one W(6) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one W(2), one W(3), and one W(6) atom. In the ninth O site, O(9) is bonded in a linear geometry to one W(1) and one W(3) atom. In the tenth O site, O(10) is bonded in a linear geometry to one W(2) and one W(4) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(5) and one W(6) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one W(3) and one W(4) atom. In the thirteenth O site, O(13) is bonded in a linear geometry to one W(1) and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_W3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.869
_cell_length_b   6.260
_cell_length_c   6.260
_cell_angle_alpha   117.430
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   134.572
_cell_formula_units_Z   1
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
  O  O0  1  0.000  0.666  0.967  1.0
  O  O1  1  1.000  0.339  0.037  1.0
  O  O2  1  1.000  0.963  0.661  1.0
  O  O3  1  0.000  0.033  0.334  1.0
  O  O4  1  0.000  0.497  0.503  1.0
  O  O5  1  0.500  0.001  0.999  1.0
  O  O6  1  0.500  0.689  0.311  1.0
  O  O7  1  0.500  0.309  0.691  1.0
  W  W8  1  1.000  0.318  0.682  1.0
  W  W9  1  1.000  0.686  0.314  1.0
  W  W10  1  1.000  1.000  0.000  1.0
[/CIF]
.