The crystal structure described by Ca(WO2)2 is Spinel-like structured and crystallizes in the triclinic P1 space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(17), one O(3), and one O(4) atom to form CaO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra,  a cornercorner with one W(10)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-67°. In the second Ca site, Ca(2) is bonded to one O(11), one O(12), one O(5), one O(6), one O(8), and one O(9) atom to form CaO6 octahedra that share corners with three equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, and  an edgeedge with one W(7)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(8) atom to form CaO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(13), one O(14), one O(15), one O(16), one O(19), and one O(20) atom to form CaO6 octahedra that share corners with three equivalent W(11)O4 trigonal pyramids, corners with three equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(7)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(15), one O(18), one O(20), one O(5), one O(7), and one O(9) atom to form CaO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent W(5)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(16), one O(17), one O(22), one O(23), and one O(24) atom to form CaO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent W(10)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. There are twelve inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the second W site, W(2) is bonded in a distorted trigonal planar geometry to one O(11), one O(2), and one O(5) atom. In the third W site, W(3) is bonded to one O(1), one O(21), one O(22), one O(24), one O(3), and one O(4) atom to form WO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra, corners with three equivalent W(12)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(4)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the fourth W site, W(4) is bonded to one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. In the fifth W site, W(5) is bonded to one O(11), one O(14), one O(18), one O(20), one O(5), and one O(7) atom to form WO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the sixth W site, W(6) is bonded to one O(13), one O(16), one O(19), and one O(7) atom to form WO4 trigonal pyramids that share  a cornercorner with one Ca(5)O6 octahedra,  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(7)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent W(10)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-70°. In the seventh W site, W(7) is bonded to one O(11), one O(14), one O(15), one O(18), one O(7), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent W(5)O6 octahedra. In the eighth W site, W(8) is bonded to one O(13), one O(17), one O(19), one O(21), one O(23), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent W(10)O6 octahedra. In the ninth W site, W(9) is bonded to one O(12), one O(18), one O(6), and one O(8) atom to form distorted WO4 trigonal pyramids that share  a cornercorner with one Ca(5)O6 octahedra,  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(7)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent Ca(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-79°. In the tenth W site, W(10) is bonded to one O(16), one O(17), one O(19), one O(21), one O(22), and one O(23) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the eleventh W site, W(11) is bonded to one O(14), one O(15), one O(20), and one O(23) atom to form distorted WO4 trigonal pyramids that share  a cornercorner with one Ca(6)O6 octahedra,  a cornercorner with one W(10)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent W(5)O6 octahedra, corners with two equivalent W(7)O6 octahedra, and corners with three equivalent Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-69°. In the twelfth W site, W(12) is bonded to one O(10), one O(21), one O(22), and one O(24) atom to form distorted WO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent W(10)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-75°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(1), and one W(3) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(3), one W(1), one W(2), and one W(4) atom. In the third O site, O(3) is bonded to one Ca(1), one Ca(3), one W(3), and one W(4) atom to form distorted OCa2W2 tetrahedra that share  a cornercorner with one O(17)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, corners with two equivalent O(10)CaW3 trigonal pyramids, and  an edgeedge with one O(4)CaW3 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one W(1), one W(3), and one W(4) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(17)Ca2W2 tetrahedra,  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, corners with two equivalent O(10)CaW3 trigonal pyramids, and  an edgeedge with one O(3)Ca2W2 tetrahedra. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(5), one W(2), and one W(5) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(1), one W(4), and one W(9) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Ca(5), one W(5), one W(6), and one W(7) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(3), one W(4), and one W(9) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(5), and one W(7) atom. In the tenth O site, O(10) is bonded to one Ca(3), one W(1), one W(12), and one W(4) atom to form OCaW3 trigonal pyramids that share corners with two equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(4)CaW3 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid, and  a cornercorner with one O(24)CaW3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(2), one W(5), and one W(7) atom. In the twelfth O site, O(12) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(3), one W(1), and one W(9) atom. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(6), one W(6), and one W(8) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ca(4), one W(11), one W(5), and one W(7) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one W(11), and one W(7) atom. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(6), one W(10), and one W(6) atom. In the seventeenth O site, O(17) is bonded to one Ca(1), one Ca(6), one W(10), and one W(8) atom to form distorted OCa2W2 tetrahedra that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(22)CaW3 trigonal pyramids, and corners with two equivalent O(24)CaW3 trigonal pyramids. In the eighteenth O site, O(18) is bonded in a trigonal pyramidal geometry to one Ca(5), one W(5), one W(7), and one W(9) atom. In the nineteenth O site, O(19) is bonded in a rectangular see-saw-like geometry to one Ca(4), one W(10), one W(6), and one W(8) atom. In the twentieth O site, O(20) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(5), one W(11), and one W(5) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one W(10), one W(12), one W(3), and one W(8) atom. In the twenty-second O site, O(22) is bonded to one Ca(6), one W(10), one W(12), and one W(3) atom to form distorted OCaW3 trigonal pyramids that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(17)Ca2W2 tetrahedra,  a cornercorner with one O(10)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, and  an edgeedge with one O(24)CaW3 trigonal pyramid. In the twenty-third O site, O(23) is bonded in a rectangular see-saw-like geometry to one Ca(6), one W(10), one W(11), and one W(8) atom. In the twenty-fourth O site, O(24) is bonded to one Ca(6), one W(12), one W(3), and one W(8) atom to form distorted OCaW3 trigonal pyramids that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(17)Ca2W2 tetrahedra,  a cornercorner with one O(10)CaW3 trigonal pyramid,  a cornercorner with one O(22)CaW3 trigonal pyramid, and  an edgeedge with one O(22)CaW3 trigonal pyramid. is represented by the CIF file [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.588
_cell_length_b   6.597
_cell_length_c   16.038
_cell_angle_alpha   90.109
_cell_angle_beta   90.758
_cell_angle_gamma   119.256
_symmetry_Int_Tables_number   1
_cell_volume   608.078
_cell_formula_units_Z   6
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  0.174  0.339  0.040  1.0
  Ca  Ca1  1  0.833  0.665  0.332  1.0
  Ca  Ca2  1  0.165  0.829  0.168  1.0
  Ca  Ca3  1  0.168  0.336  0.668  1.0
  Ca  Ca4  1  0.491  0.491  0.497  1.0
  Ca  Ca5  1  0.832  0.180  0.834  1.0
  W  W6  1  0.667  0.839  0.167  1.0
  W  W7  1  0.457  0.050  0.366  1.0
  W  W8  1  0.500  0.001  0.000  1.0
  W  W9  1  0.674  0.334  0.169  1.0
  W  W10  1  0.998  0.496  0.501  1.0
  W  W11  1  0.806  0.705  0.700  1.0
  W  W12  1  0.998  0.998  0.502  1.0
  W  W13  1  0.335  0.168  0.831  1.0
  W  W14  1  0.208  0.313  0.295  1.0
  W  W15  1  0.327  0.664  0.829  1.0
  W  W16  1  0.542  0.949  0.633  1.0
  W  W17  1  0.883  0.695  0.970  1.0
  O  O18  1  0.374  0.721  0.079  1.0
  O  O19  1  0.524  0.012  0.247  1.0
  O  O20  1  0.373  0.155  0.082  1.0
  O  O21  1  0.789  0.145  0.088  1.0
  O  O22  1  0.689  0.335  0.424  1.0
  O  O23  1  0.516  0.519  0.234  1.0
  O  O24  1  0.867  0.681  0.577  1.0
  O  O25  1  0.997  0.491  0.245  1.0
  O  O26  1  0.706  0.826  0.433  1.0
  O  O27  1  0.796  0.647  0.093  1.0
  O  O28  1  0.158  0.827  0.429  1.0
  O  O29  1  0.968  0.976  0.247  1.0
  O  O30  1  0.017  0.004  0.756  1.0
  O  O31  1  0.842  0.174  0.575  1.0
  O  O32  1  0.292  0.157  0.575  1.0
  O  O33  1  0.005  0.514  0.751  1.0
  O  O34  1  0.188  0.346  0.898  1.0
  O  O35  1  0.113  0.293  0.431  1.0
  O  O36  1  0.504  0.495  0.760  1.0
  O  O37  1  0.310  0.658  0.578  1.0
  O  O38  1  0.200  0.853  0.907  1.0
  O  O39  1  0.620  0.844  0.917  1.0
  O  O40  1  0.478  0.991  0.752  1.0
  O  O41  1  0.619  0.282  0.920  1.0
[/CIF]
.
The crystal structure described by Ca(WO2)2 is Spinel-like structured and crystallizes in the triclinic P1 space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(17), one O(3), and one O(4) atom to form CaO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra,  a cornercorner with one W(10)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-67°. In the second Ca site, Ca(2) is bonded to one O(11), one O(12), one O(5), one O(6), one O(8), and one O(9) atom to form CaO6 octahedra that share corners with three equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, and  an edgeedge with one W(7)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(8) atom to form CaO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(13), one O(14), one O(15), one O(16), one O(19), and one O(20) atom to form CaO6 octahedra that share corners with three equivalent W(11)O4 trigonal pyramids, corners with three equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra,  an edgeedge with one W(7)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(15), one O(18), one O(20), one O(5), one O(7), and one O(9) atom to form CaO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent W(5)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(16), one O(17), one O(22), one O(23), and one O(24) atom to form CaO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent W(10)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. There are twelve inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(12), one O(2), one O(4), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the second W site, W(2) is bonded in a distorted trigonal planar geometry to one O(11), one O(2), and one O(5) atom. In the third W site, W(3) is bonded to one O(1), one O(21), one O(22), one O(24), one O(3), and one O(4) atom to form WO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra, corners with three equivalent W(12)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(4)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the fourth W site, W(4) is bonded to one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one W(12)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent W(9)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. In the fifth W site, W(5) is bonded to one O(11), one O(14), one O(18), one O(20), one O(5), and one O(7) atom to form WO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the sixth W site, W(6) is bonded to one O(13), one O(16), one O(19), and one O(7) atom to form WO4 trigonal pyramids that share  a cornercorner with one Ca(5)O6 octahedra,  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(7)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent W(10)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-70°. In the seventh W site, W(7) is bonded to one O(11), one O(14), one O(15), one O(18), one O(7), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one W(6)O4 trigonal pyramid,  a cornercorner with one W(9)O4 trigonal pyramid, corners with two equivalent W(11)O4 trigonal pyramids,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent W(5)O6 octahedra. In the eighth W site, W(8) is bonded to one O(13), one O(17), one O(19), one O(21), one O(23), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent W(10)O6 octahedra. In the ninth W site, W(9) is bonded to one O(12), one O(18), one O(6), and one O(8) atom to form distorted WO4 trigonal pyramids that share  a cornercorner with one Ca(5)O6 octahedra,  a cornercorner with one W(5)O6 octahedra,  a cornercorner with one W(7)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent Ca(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-79°. In the tenth W site, W(10) is bonded to one O(16), one O(17), one O(19), one O(21), one O(22), and one O(23) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra, corners with two equivalent W(12)O4 tetrahedra,  a cornercorner with one W(11)O4 trigonal pyramid, corners with two equivalent W(6)O4 trigonal pyramids,  an edgeedge with one Ca(4)O6 octahedra,  an edgeedge with one W(3)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the eleventh W site, W(11) is bonded to one O(14), one O(15), one O(20), and one O(23) atom to form distorted WO4 trigonal pyramids that share  a cornercorner with one Ca(6)O6 octahedra,  a cornercorner with one W(10)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent W(5)O6 octahedra, corners with two equivalent W(7)O6 octahedra, and corners with three equivalent Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-69°. In the twelfth W site, W(12) is bonded to one O(10), one O(21), one O(22), and one O(24) atom to form distorted WO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent W(10)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-75°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(1), and one W(3) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(3), one W(1), one W(2), and one W(4) atom. In the third O site, O(3) is bonded to one Ca(1), one Ca(3), one W(3), and one W(4) atom to form distorted OCa2W2 tetrahedra that share  a cornercorner with one O(17)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, corners with two equivalent O(10)CaW3 trigonal pyramids, and  an edgeedge with one O(4)CaW3 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one W(1), one W(3), and one W(4) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(17)Ca2W2 tetrahedra,  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, corners with two equivalent O(10)CaW3 trigonal pyramids, and  an edgeedge with one O(3)Ca2W2 tetrahedra. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(5), one W(2), and one W(5) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(1), one W(4), and one W(9) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Ca(5), one W(5), one W(6), and one W(7) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(3), one W(4), and one W(9) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(2), one Ca(5), and one W(7) atom. In the tenth O site, O(10) is bonded to one Ca(3), one W(1), one W(12), and one W(4) atom to form OCaW3 trigonal pyramids that share corners with two equivalent O(3)Ca2W2 tetrahedra, corners with two equivalent O(4)CaW3 tetrahedra,  a cornercorner with one O(22)CaW3 trigonal pyramid, and  a cornercorner with one O(24)CaW3 trigonal pyramid. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Ca(2), one W(2), one W(5), and one W(7) atom. In the twelfth O site, O(12) is bonded in a rectangular see-saw-like geometry to one Ca(2), one Ca(3), one W(1), and one W(9) atom. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(6), one W(6), and one W(8) atom. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Ca(4), one W(11), one W(5), and one W(7) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one W(11), and one W(7) atom. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(6), one W(10), and one W(6) atom. In the seventeenth O site, O(17) is bonded to one Ca(1), one Ca(6), one W(10), and one W(8) atom to form distorted OCa2W2 tetrahedra that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(22)CaW3 trigonal pyramids, and corners with two equivalent O(24)CaW3 trigonal pyramids. In the eighteenth O site, O(18) is bonded in a trigonal pyramidal geometry to one Ca(5), one W(5), one W(7), and one W(9) atom. In the nineteenth O site, O(19) is bonded in a rectangular see-saw-like geometry to one Ca(4), one W(10), one W(6), and one W(8) atom. In the twentieth O site, O(20) is bonded in a rectangular see-saw-like geometry to one Ca(4), one Ca(5), one W(11), and one W(5) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one W(10), one W(12), one W(3), and one W(8) atom. In the twenty-second O site, O(22) is bonded to one Ca(6), one W(10), one W(12), and one W(3) atom to form distorted OCaW3 trigonal pyramids that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(17)Ca2W2 tetrahedra,  a cornercorner with one O(10)CaW3 trigonal pyramid,  a cornercorner with one O(24)CaW3 trigonal pyramid, and  an edgeedge with one O(24)CaW3 trigonal pyramid. In the twenty-third O site, O(23) is bonded in a rectangular see-saw-like geometry to one Ca(6), one W(10), one W(11), and one W(8) atom. In the twenty-fourth O site, O(24) is bonded to one Ca(6), one W(12), one W(3), and one W(8) atom to form distorted OCaW3 trigonal pyramids that share  a cornercorner with one O(3)Ca2W2 tetrahedra,  a cornercorner with one O(4)CaW3 tetrahedra, corners with two equivalent O(17)Ca2W2 tetrahedra,  a cornercorner with one O(10)CaW3 trigonal pyramid,  a cornercorner with one O(22)CaW3 trigonal pyramid, and  an edgeedge with one O(22)CaW3 trigonal pyramid. is represented by the CIF file [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.588
_cell_length_b   6.597
_cell_length_c   16.038
_cell_angle_alpha   90.109
_cell_angle_beta   90.758
_cell_angle_gamma   119.256
_symmetry_Int_Tables_number   1
_cell_volume   608.078
_cell_formula_units_Z   6
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  0.174  0.339  0.040  1.0
  Ca  Ca1  1  0.833  0.665  0.332  1.0
  Ca  Ca2  1  0.165  0.829  0.168  1.0
  Ca  Ca3  1  0.168  0.336  0.668  1.0
  Ca  Ca4  1  0.491  0.491  0.497  1.0
  Ca  Ca5  1  0.832  0.180  0.834  1.0
  W  W6  1  0.667  0.839  0.167  1.0
  W  W7  1  0.457  0.050  0.366  1.0
  W  W8  1  0.500  0.001  0.000  1.0
  W  W9  1  0.674  0.334  0.169  1.0
  W  W10  1  0.998  0.496  0.501  1.0
  W  W11  1  0.806  0.705  0.700  1.0
  W  W12  1  0.998  0.998  0.502  1.0
  W  W13  1  0.335  0.168  0.831  1.0
  W  W14  1  0.208  0.313  0.295  1.0
  W  W15  1  0.327  0.664  0.829  1.0
  W  W16  1  0.542  0.949  0.633  1.0
  W  W17  1  0.883  0.695  0.970  1.0
  O  O18  1  0.374  0.721  0.079  1.0
  O  O19  1  0.524  0.012  0.247  1.0
  O  O20  1  0.373  0.155  0.082  1.0
  O  O21  1  0.789  0.145  0.088  1.0
  O  O22  1  0.689  0.335  0.424  1.0
  O  O23  1  0.516  0.519  0.234  1.0
  O  O24  1  0.867  0.681  0.577  1.0
  O  O25  1  0.997  0.491  0.245  1.0
  O  O26  1  0.706  0.826  0.433  1.0
  O  O27  1  0.796  0.647  0.093  1.0
  O  O28  1  0.158  0.827  0.429  1.0
  O  O29  1  0.968  0.976  0.247  1.0
  O  O30  1  0.017  0.004  0.756  1.0
  O  O31  1  0.842  0.174  0.575  1.0
  O  O32  1  0.292  0.157  0.575  1.0
  O  O33  1  0.005  0.514  0.751  1.0
  O  O34  1  0.188  0.346  0.898  1.0
  O  O35  1  0.113  0.293  0.431  1.0
  O  O36  1  0.504  0.495  0.760  1.0
  O  O37  1  0.310  0.658  0.578  1.0
  O  O38  1  0.200  0.853  0.907  1.0
  O  O39  1  0.620  0.844  0.917  1.0
  O  O40  1  0.478  0.991  0.752  1.0
  O  O41  1  0.619  0.282  0.920  1.0
[/CIF]
.