The crystal structure described by Ca2WO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(2), one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted CaO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 23-30°. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with four equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. In the second W site, W(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(1), and one W(1) atom. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one W(1), and one W(2) atom to form distorted OCa2W2 trigonal pyramids that share corners with three equivalent O(3)Ca3W tetrahedra, corners with two equivalent O(2)Ca2W2 trigonal pyramids, corners with three equivalent O(5)Ca3W trigonal pyramids,  an edgeedge with one O(3)Ca3W tetrahedra, and  an edgeedge with one O(5)Ca3W trigonal pyramid. In the third O site, O(3) is bonded to one Ca(2), two equivalent Ca(1), and one W(1) atom to form distorted OCa3W tetrahedra that share corners with three equivalent O(3)Ca3W tetrahedra, corners with three equivalent O(2)Ca2W2 trigonal pyramids, corners with four equivalent O(5)Ca3W trigonal pyramids, and  an edgeedge with one O(2)Ca2W2 trigonal pyramid. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one W(2) atom. In the fifth O site, O(5) is bonded to one Ca(1), two equivalent Ca(2), and one W(2) atom to form distorted OCa3W trigonal pyramids that share corners with four equivalent O(3)Ca3W tetrahedra, corners with three equivalent O(2)Ca2W2 trigonal pyramids, corners with three equivalent O(5)Ca3W trigonal pyramids, and  an edgeedge with one O(2)Ca2W2 trigonal pyramid. is represented by the CIF file [CIF]
data_Ca2WO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.299
_cell_length_b   7.448
_cell_length_c   11.096
_cell_angle_alpha   70.888
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   413.750
_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
  Ca  Ca0  1  0.582  0.846  0.814  1.0
  Ca  Ca1  1  0.918  0.846  0.314  1.0
  Ca  Ca2  1  0.010  0.660  0.629  1.0
  Ca  Ca3  1  0.510  0.340  0.871  1.0
  Ca  Ca4  1  0.490  0.660  0.129  1.0
  Ca  Ca5  1  0.990  0.340  0.371  1.0
  Ca  Ca6  1  0.082  0.154  0.686  1.0
  Ca  Ca7  1  0.418  0.154  0.186  1.0
  W  W8  1  0.500  0.000  0.500  1.0
  W  W9  1  0.000  0.000  0.000  1.0
  W  W10  1  0.500  0.500  0.500  1.0
  W  W11  1  0.000  0.500  0.000  1.0
  O  O12  1  0.772  0.995  0.612  1.0
  O  O13  1  0.871  0.749  0.000  1.0
  O  O14  1  0.297  0.886  0.646  1.0
  O  O15  1  0.308  0.607  0.928  1.0
  O  O16  1  0.728  0.995  0.112  1.0
  O  O17  1  0.629  0.749  0.500  1.0
  O  O18  1  0.203  0.886  0.146  1.0
  O  O19  1  0.847  0.556  0.833  1.0
  O  O20  1  0.192  0.607  0.428  1.0
  O  O21  1  0.347  0.444  0.667  1.0
  O  O22  1  0.653  0.556  0.333  1.0
  O  O23  1  0.808  0.393  0.572  1.0
  O  O24  1  0.153  0.444  0.167  1.0
  O  O25  1  0.797  0.114  0.854  1.0
  O  O26  1  0.371  0.251  0.500  1.0
  O  O27  1  0.272  0.005  0.888  1.0
  O  O28  1  0.692  0.393  0.072  1.0
  O  O29  1  0.703  0.114  0.354  1.0
  O  O30  1  0.129  0.251  1.000  1.0
  O  O31  1  0.228  0.005  0.388  1.0
[/CIF]
.
The crystal structure described by Ca2WO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(2), one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted CaO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 23-30°. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with four equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. In the second W site, W(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 40°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(1), and one W(1) atom. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one W(1), and one W(2) atom to form distorted OCa2W2 trigonal pyramids that share corners with three equivalent O(3)Ca3W tetrahedra, corners with two equivalent O(2)Ca2W2 trigonal pyramids, corners with three equivalent O(5)Ca3W trigonal pyramids,  an edgeedge with one O(3)Ca3W tetrahedra, and  an edgeedge with one O(5)Ca3W trigonal pyramid. In the third O site, O(3) is bonded to one Ca(2), two equivalent Ca(1), and one W(1) atom to form distorted OCa3W tetrahedra that share corners with three equivalent O(3)Ca3W tetrahedra, corners with three equivalent O(2)Ca2W2 trigonal pyramids, corners with four equivalent O(5)Ca3W trigonal pyramids, and  an edgeedge with one O(2)Ca2W2 trigonal pyramid. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one W(2) atom. In the fifth O site, O(5) is bonded to one Ca(1), two equivalent Ca(2), and one W(2) atom to form distorted OCa3W trigonal pyramids that share corners with four equivalent O(3)Ca3W tetrahedra, corners with three equivalent O(2)Ca2W2 trigonal pyramids, corners with three equivalent O(5)Ca3W trigonal pyramids, and  an edgeedge with one O(2)Ca2W2 trigonal pyramid. is represented by the CIF file [CIF]
data_Ca2WO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.299
_cell_length_b   7.448
_cell_length_c   11.096
_cell_angle_alpha   70.888
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   413.750
_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
  Ca  Ca0  1  0.582  0.846  0.814  1.0
  Ca  Ca1  1  0.918  0.846  0.314  1.0
  Ca  Ca2  1  0.010  0.660  0.629  1.0
  Ca  Ca3  1  0.510  0.340  0.871  1.0
  Ca  Ca4  1  0.490  0.660  0.129  1.0
  Ca  Ca5  1  0.990  0.340  0.371  1.0
  Ca  Ca6  1  0.082  0.154  0.686  1.0
  Ca  Ca7  1  0.418  0.154  0.186  1.0
  W  W8  1  0.500  0.000  0.500  1.0
  W  W9  1  0.000  0.000  0.000  1.0
  W  W10  1  0.500  0.500  0.500  1.0
  W  W11  1  0.000  0.500  0.000  1.0
  O  O12  1  0.772  0.995  0.612  1.0
  O  O13  1  0.871  0.749  0.000  1.0
  O  O14  1  0.297  0.886  0.646  1.0
  O  O15  1  0.308  0.607  0.928  1.0
  O  O16  1  0.728  0.995  0.112  1.0
  O  O17  1  0.629  0.749  0.500  1.0
  O  O18  1  0.203  0.886  0.146  1.0
  O  O19  1  0.847  0.556  0.833  1.0
  O  O20  1  0.192  0.607  0.428  1.0
  O  O21  1  0.347  0.444  0.667  1.0
  O  O22  1  0.653  0.556  0.333  1.0
  O  O23  1  0.808  0.393  0.572  1.0
  O  O24  1  0.153  0.444  0.167  1.0
  O  O25  1  0.797  0.114  0.854  1.0
  O  O26  1  0.371  0.251  0.500  1.0
  O  O27  1  0.272  0.005  0.888  1.0
  O  O28  1  0.692  0.393  0.072  1.0
  O  O29  1  0.703  0.114  0.354  1.0
  O  O30  1  0.129  0.251  1.000  1.0
  O  O31  1  0.228  0.005  0.388  1.0
[/CIF]
.