The structure described by MgW2O5 crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(3), one O(7), two equivalent O(10), and two equivalent O(2) atoms to form distorted MgO6 octahedra that share corners with four equivalent W(4)O6 octahedra,  a cornercorner with one W(2)O5 trigonal bipyramid, corners with two equivalent W(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-59°. In the second Mg site, Mg(2) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with four equivalent W(3)O6 octahedra,  a cornercorner with one W(1)O5 trigonal bipyramid, corners with two equivalent W(2)O5 trigonal bipyramids, edges with two equivalent Mg(2)O6 octahedra, and edges with two equivalent W(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-58°. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(10), one O(2), one O(4), and two equivalent O(3) atoms to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent W(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 28-63°. In the second W site, W(2) is bonded to one O(1), one O(3), one O(9), and two equivalent O(4) atoms to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(3)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent W(2)O5 trigonal bipyramids, edges with two equivalent Mg(2)O6 octahedra, and edges with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 27-62°. In the third W site, W(3) is bonded to one O(1), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form WO6 octahedra that share corners with four equivalent Mg(2)O6 octahedra,  a cornercorner with one W(2)O5 trigonal bipyramid, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the fourth W site, W(4) is bonded to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms to form distorted WO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra,  a cornercorner with one W(1)O5 trigonal bipyramid, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-59°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(2), one W(2), and one W(3) atom to form distorted OMg2W2 trigonal pyramids that share corners with two equivalent O(1)Mg2W2 trigonal pyramids and edges with two equivalent O(4)MgW3 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1), one W(1), and one W(4) atom to form distorted OMg2W2 trigonal pyramids that share  a cornercorner with one O(4)MgW3 trigonal pyramid and corners with two equivalent O(2)Mg2W2 trigonal pyramids. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one W(2), and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded to one Mg(2), one W(1), and two equivalent W(2) atoms to form distorted OMgW3 trigonal pyramids that share  a cornercorner with one O(2)Mg2W2 trigonal pyramid, corners with two equivalent O(4)MgW3 trigonal pyramids, and edges with two equivalent O(1)Mg2W2 trigonal pyramids. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one W(3) and two equivalent W(4) atoms. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one W(4) and two equivalent W(3) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent W(4) atoms. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mg(2) and two equivalent W(3) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to two equivalent Mg(2) and one W(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one W(1) atom. is represented by the CIF card [CIF]
data_MgW2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.223
_cell_length_b   5.235
_cell_length_c   12.545
_cell_angle_alpha   84.774
_cell_angle_beta   89.303
_cell_angle_gamma   89.444
_symmetry_Int_Tables_number   1
_cell_volume   210.716
_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
  Mg  Mg0  1  0.228  0.097  0.224  1.0
  Mg  Mg1  1  0.765  0.896  0.777  1.0
  W  W2  1  0.742  0.598  0.104  1.0
  W  W3  1  0.256  0.398  0.896  1.0
  W  W4  1  0.261  0.424  0.612  1.0
  W  W5  1  0.764  0.585  0.389  1.0
  O  O6  1  0.252  0.618  0.743  1.0
  O  O7  1  0.733  0.382  0.257  1.0
  O  O8  1  0.250  0.351  0.058  1.0
  O  O9  1  0.753  0.657  0.924  1.0
  O  O10  1  0.272  0.348  0.462  1.0
  O  O11  1  0.760  0.653  0.556  1.0
  O  O12  1  0.234  0.811  0.349  1.0
  O  O13  1  0.766  0.198  0.657  1.0
  O  O14  1  0.261  0.085  0.837  1.0
  O  O15  1  0.734  0.931  0.159  1.0
[/CIF]
.
The structure described by MgW2O5 crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(3), one O(7), two equivalent O(10), and two equivalent O(2) atoms to form distorted MgO6 octahedra that share corners with four equivalent W(4)O6 octahedra,  a cornercorner with one W(2)O5 trigonal bipyramid, corners with two equivalent W(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-59°. In the second Mg site, Mg(2) is bonded to one O(4), one O(8), two equivalent O(1), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with four equivalent W(3)O6 octahedra,  a cornercorner with one W(1)O5 trigonal bipyramid, corners with two equivalent W(2)O5 trigonal bipyramids, edges with two equivalent Mg(2)O6 octahedra, and edges with two equivalent W(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-58°. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(10), one O(2), one O(4), and two equivalent O(3) atoms to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent W(1)O5 trigonal bipyramids, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent W(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 28-63°. In the second W site, W(2) is bonded to one O(1), one O(3), one O(9), and two equivalent O(4) atoms to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(3)O6 octahedra, corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent W(2)O5 trigonal bipyramids, edges with two equivalent Mg(2)O6 octahedra, and edges with two equivalent W(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 27-62°. In the third W site, W(3) is bonded to one O(1), one O(5), two equivalent O(6), and two equivalent O(8) atoms to form WO6 octahedra that share corners with four equivalent Mg(2)O6 octahedra,  a cornercorner with one W(2)O5 trigonal bipyramid, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the fourth W site, W(4) is bonded to one O(2), one O(6), two equivalent O(5), and two equivalent O(7) atoms to form distorted WO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra,  a cornercorner with one W(1)O5 trigonal bipyramid, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-59°. There are ten inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(2), one W(2), and one W(3) atom to form distorted OMg2W2 trigonal pyramids that share corners with two equivalent O(1)Mg2W2 trigonal pyramids and edges with two equivalent O(4)MgW3 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1), one W(1), and one W(4) atom to form distorted OMg2W2 trigonal pyramids that share  a cornercorner with one O(4)MgW3 trigonal pyramid and corners with two equivalent O(2)Mg2W2 trigonal pyramids. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one W(2), and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded to one Mg(2), one W(1), and two equivalent W(2) atoms to form distorted OMgW3 trigonal pyramids that share  a cornercorner with one O(2)Mg2W2 trigonal pyramid, corners with two equivalent O(4)MgW3 trigonal pyramids, and edges with two equivalent O(1)Mg2W2 trigonal pyramids. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one W(3) and two equivalent W(4) atoms. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one W(4) and two equivalent W(3) atoms. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent W(4) atoms. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mg(2) and two equivalent W(3) atoms. In the ninth O site, O(9) is bonded in a trigonal planar geometry to two equivalent Mg(2) and one W(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one W(1) atom. is represented by the CIF card [CIF]
data_MgW2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.223
_cell_length_b   5.235
_cell_length_c   12.545
_cell_angle_alpha   84.774
_cell_angle_beta   89.303
_cell_angle_gamma   89.444
_symmetry_Int_Tables_number   1
_cell_volume   210.716
_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
  Mg  Mg0  1  0.228  0.097  0.224  1.0
  Mg  Mg1  1  0.765  0.896  0.777  1.0
  W  W2  1  0.742  0.598  0.104  1.0
  W  W3  1  0.256  0.398  0.896  1.0
  W  W4  1  0.261  0.424  0.612  1.0
  W  W5  1  0.764  0.585  0.389  1.0
  O  O6  1  0.252  0.618  0.743  1.0
  O  O7  1  0.733  0.382  0.257  1.0
  O  O8  1  0.250  0.351  0.058  1.0
  O  O9  1  0.753  0.657  0.924  1.0
  O  O10  1  0.272  0.348  0.462  1.0
  O  O11  1  0.760  0.653  0.556  1.0
  O  O12  1  0.234  0.811  0.349  1.0
  O  O13  1  0.766  0.198  0.657  1.0
  O  O14  1  0.261  0.085  0.837  1.0
  O  O15  1  0.734  0.931  0.159  1.0
[/CIF]
.