The compound described by Ca(WO2)2 is beta indium sulfide-derived structured and crystallizes in the trigonal R3m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(3) and three equivalent O(4) atoms to form CaO4 tetrahedra that share corners with three equivalent Ca(2)O6 octahedra and corners with nine equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-65°. In the second Ca site, Ca(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form CaO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra and edges with six equivalent W(2)O6 octahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. In the second W site, W(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form WO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, and edges with four equivalent W(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(1), and two equivalent W(2) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent W(2) atoms. In the third O site, O(3) is bonded to one Ca(1) and three equivalent W(2) atoms to form a mixture of distorted corner and edge-sharing OCaW3 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), and two equivalent W(2) atoms to form distorted OCa2W2 trigonal pyramids that share  a cornercorner with one O(3)CaW3 tetrahedra, corners with two equivalent O(4)Ca2W2 trigonal pyramids,  an edgeedge with one O(3)CaW3 tetrahedra, and edges with two equivalent O(4)Ca2W2 trigonal pyramids. is represented by the CIF file [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.705
_cell_length_b   6.705
_cell_length_c   6.705
_cell_angle_alpha   59.393
_cell_angle_beta   59.393
_cell_angle_gamma   59.393
_symmetry_Int_Tables_number   1
_cell_volume   210.231
_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
  Ca  Ca0  1  0.000  0.000  0.000  1.0
  Ca  Ca1  1  0.630  0.630  0.630  1.0
  W  W2  1  0.205  0.205  0.205  1.0
  W  W3  1  0.626  0.125  0.626  1.0
  W  W4  1  0.626  0.626  0.125  1.0
  W  W5  1  0.125  0.626  0.626  1.0
  O  O6  1  0.852  0.378  0.378  1.0
  O  O7  1  0.378  0.378  0.852  1.0
  O  O8  1  0.378  0.852  0.378  1.0
  O  O9  1  0.399  0.399  0.399  1.0
  O  O10  1  0.860  0.860  0.860  1.0
  O  O11  1  0.877  0.417  0.877  1.0
  O  O12  1  0.877  0.877  0.417  1.0
  O  O13  1  0.417  0.877  0.877  1.0
[/CIF]
.
The compound described by Ca(WO2)2 is beta indium sulfide-derived structured and crystallizes in the trigonal R3m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(3) and three equivalent O(4) atoms to form CaO4 tetrahedra that share corners with three equivalent Ca(2)O6 octahedra and corners with nine equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-65°. In the second Ca site, Ca(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form CaO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra and edges with six equivalent W(2)O6 octahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. In the second W site, W(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form WO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, and edges with four equivalent W(2)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(1), and two equivalent W(2) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent W(2) atoms. In the third O site, O(3) is bonded to one Ca(1) and three equivalent W(2) atoms to form a mixture of distorted corner and edge-sharing OCaW3 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), and two equivalent W(2) atoms to form distorted OCa2W2 trigonal pyramids that share  a cornercorner with one O(3)CaW3 tetrahedra, corners with two equivalent O(4)Ca2W2 trigonal pyramids,  an edgeedge with one O(3)CaW3 tetrahedra, and edges with two equivalent O(4)Ca2W2 trigonal pyramids. is represented by the CIF file [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.705
_cell_length_b   6.705
_cell_length_c   6.705
_cell_angle_alpha   59.393
_cell_angle_beta   59.393
_cell_angle_gamma   59.393
_symmetry_Int_Tables_number   1
_cell_volume   210.231
_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
  Ca  Ca0  1  0.000  0.000  0.000  1.0
  Ca  Ca1  1  0.630  0.630  0.630  1.0
  W  W2  1  0.205  0.205  0.205  1.0
  W  W3  1  0.626  0.125  0.626  1.0
  W  W4  1  0.626  0.626  0.125  1.0
  W  W5  1  0.125  0.626  0.626  1.0
  O  O6  1  0.852  0.378  0.378  1.0
  O  O7  1  0.378  0.378  0.852  1.0
  O  O8  1  0.378  0.852  0.378  1.0
  O  O9  1  0.399  0.399  0.399  1.0
  O  O10  1  0.860  0.860  0.860  1.0
  O  O11  1  0.877  0.417  0.877  1.0
  O  O12  1  0.877  0.877  0.417  1.0
  O  O13  1  0.417  0.877  0.877  1.0
[/CIF]
.