The structure described by CaWO2 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), and two equivalent O(4) atoms. In the second Ca site, Ca(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(2) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second W site, W(2) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form edge-sharing WO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one W(2), and two equivalent W(1) atoms to form OCaW3 trigonal pyramids that share corners with three equivalent O(2)Ca2W3 square pyramids, corners with three equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(1)CaW3 trigonal pyramids,  an edgeedge with one O(3)Ca2W2 tetrahedra, and edges with two equivalent O(4)Ca3W2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ca(2) and three equivalent W(2) atoms to form OCa2W3 square pyramids that share corners with two equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(4)Ca3W2 trigonal bipyramids, corners with three equivalent O(1)CaW3 trigonal pyramids, edges with four equivalent O(2)Ca2W3 square pyramids, and edges with three equivalent O(4)Ca3W2 trigonal bipyramids. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), and two equivalent W(1) atoms to form OCa2W2 tetrahedra that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with two equivalent O(3)Ca2W2 tetrahedra, corners with three equivalent O(4)Ca3W2 trigonal bipyramids, corners with three equivalent O(1)CaW3 trigonal pyramids, and  an edgeedge with one O(1)CaW3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(2), two equivalent Ca(1), and two equivalent W(2) atoms to form distorted OCa3W2 trigonal bipyramids that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with three equivalent O(3)Ca2W2 tetrahedra, edges with three equivalent O(2)Ca2W3 square pyramids, edges with two equivalent O(4)Ca3W2 trigonal bipyramids, and edges with two equivalent O(1)CaW3 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaWO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.396
_cell_length_b   9.109
_cell_length_c   9.705
_cell_angle_alpha   103.638
_cell_angle_beta   90.205
_cell_angle_gamma   100.615
_symmetry_Int_Tables_number   1
_cell_volume   286.394
_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  0.386  0.266  0.931  1.0
  Ca  Ca1  1  0.614  0.734  0.069  1.0
  Ca  Ca2  1  0.323  0.149  0.292  1.0
  Ca  Ca3  1  0.677  0.851  0.708  1.0
  W  W4  1  0.013  0.525  0.783  1.0
  W  W5  1  0.318  0.136  0.620  1.0
  W  W6  1  0.682  0.864  0.380  1.0
  W  W7  1  0.987  0.475  0.217  1.0
  O  O8  1  0.563  0.627  0.273  1.0
  O  O9  1  0.191  0.880  0.536  1.0
  O  O10  1  0.809  0.120  0.464  1.0
  O  O11  1  0.437  0.373  0.727  1.0
  O  O12  1  0.590  0.682  0.834  1.0
  O  O13  1  0.811  0.120  0.763  1.0
  O  O14  1  0.410  0.318  0.166  1.0
  O  O15  1  0.189  0.880  0.237  1.0
[/CIF]
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The structure described by CaWO2 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), and two equivalent O(4) atoms. In the second Ca site, Ca(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(2) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second W site, W(2) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form edge-sharing WO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one W(2), and two equivalent W(1) atoms to form OCaW3 trigonal pyramids that share corners with three equivalent O(2)Ca2W3 square pyramids, corners with three equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(1)CaW3 trigonal pyramids,  an edgeedge with one O(3)Ca2W2 tetrahedra, and edges with two equivalent O(4)Ca3W2 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Ca(2) and three equivalent W(2) atoms to form OCa2W3 square pyramids that share corners with two equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(4)Ca3W2 trigonal bipyramids, corners with three equivalent O(1)CaW3 trigonal pyramids, edges with four equivalent O(2)Ca2W3 square pyramids, and edges with three equivalent O(4)Ca3W2 trigonal bipyramids. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), and two equivalent W(1) atoms to form OCa2W2 tetrahedra that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with two equivalent O(3)Ca2W2 tetrahedra, corners with three equivalent O(4)Ca3W2 trigonal bipyramids, corners with three equivalent O(1)CaW3 trigonal pyramids, and  an edgeedge with one O(1)CaW3 trigonal pyramid. In the fourth O site, O(4) is bonded to one Ca(2), two equivalent Ca(1), and two equivalent W(2) atoms to form distorted OCa3W2 trigonal bipyramids that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with three equivalent O(3)Ca2W2 tetrahedra, edges with three equivalent O(2)Ca2W3 square pyramids, edges with two equivalent O(4)Ca3W2 trigonal bipyramids, and edges with two equivalent O(1)CaW3 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaWO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.396
_cell_length_b   9.109
_cell_length_c   9.705
_cell_angle_alpha   103.638
_cell_angle_beta   90.205
_cell_angle_gamma   100.615
_symmetry_Int_Tables_number   1
_cell_volume   286.394
_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  0.386  0.266  0.931  1.0
  Ca  Ca1  1  0.614  0.734  0.069  1.0
  Ca  Ca2  1  0.323  0.149  0.292  1.0
  Ca  Ca3  1  0.677  0.851  0.708  1.0
  W  W4  1  0.013  0.525  0.783  1.0
  W  W5  1  0.318  0.136  0.620  1.0
  W  W6  1  0.682  0.864  0.380  1.0
  W  W7  1  0.987  0.475  0.217  1.0
  O  O8  1  0.563  0.627  0.273  1.0
  O  O9  1  0.191  0.880  0.536  1.0
  O  O10  1  0.809  0.120  0.464  1.0
  O  O11  1  0.437  0.373  0.727  1.0
  O  O12  1  0.590  0.682  0.834  1.0
  O  O13  1  0.811  0.120  0.763  1.0
  O  O14  1  0.410  0.318  0.166  1.0
  O  O15  1  0.189  0.880  0.237  1.0
[/CIF]
.