The compound 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 W(11)O6 octahedra,  a cornercorner with one W(7)O6 octahedra,  a cornercorner with one W(9)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second Ca site, Ca(2) is bonded to one O(12), one O(2), one O(6), and one O(9) atom to form CaO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent W(3)O6 octahedra, corners with two equivalent W(6)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-62°. In the third Ca site, Ca(3) is bonded to one O(1), one O(21), one O(23), one O(24), one O(3), and one O(4) atom to form distorted CaO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(11)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(7)O6 octahedra, and  an edgeedge with one W(9)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(10), one O(14), one O(18), and one O(20) atom to form CaO4 tetrahedra that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent W(11)O6 octahedra, corners with two equivalent W(7)O6 octahedra, corners with two equivalent W(9)O6 octahedra, and corners with three equivalent W(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-64°. In the fifth Ca site, Ca(5) is bonded to one O(11), one O(16), one O(5), and one O(7) atom to form CaO4 tetrahedra that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent W(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-63°. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(15), one O(19), and one O(22) atom to form CaO4 tetrahedra that share  a cornercorner with one W(11)O6 octahedra,  a cornercorner with one W(7)O6 octahedra,  a cornercorner with one W(9)O6 octahedra, corners with two equivalent W(3)O6 octahedra, corners with two equivalent W(6)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-63°. There are twelve inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the third W site, W(3) is bonded to one O(10), one O(15), one O(16), one O(19), one O(6), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(6)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the fourth W site, W(4) is bonded to one O(1), one O(11), one O(2), one O(4), one O(5), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. In the fifth W site, W(5) is bonded to one O(11), one O(12), one O(5), one O(6), one O(7), and one O(9) atom to form WO6 octahedra that share corners with three equivalent Ca(2)O4 tetrahedra, corners with three equivalent Ca(5)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(6)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the sixth W site, W(6) is bonded to one O(10), one O(12), one O(13), one O(15), one O(16), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the seventh W site, W(7) is bonded to one O(14), one O(17), one O(18), one O(22), one O(23), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(11)O6 octahedra, and edges with two equivalent W(9)O6 octahedra. In the eighth W site, W(8) is bonded to one O(10), one O(12), one O(13), one O(16), one O(19), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(6)O6 octahedra. In the ninth W site, W(9) is bonded to one O(14), one O(17), one O(20), one O(21), one O(22), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(11)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the tenth W site, W(10) is bonded to one O(13), one O(14), one O(15), one O(18), one O(19), and one O(20) atom to form WO6 octahedra that share corners with three equivalent Ca(4)O4 tetrahedra, corners with three equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(11)O6 octahedra,  an edgeedge with one W(3)O6 octahedra,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(7)O6 octahedra,  an edgeedge with one W(8)O6 octahedra, and  an edgeedge with one W(9)O6 octahedra. In the eleventh W site, W(11) is bonded to one O(17), one O(18), one O(20), 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,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(7)O6 octahedra, and edges with two equivalent W(9)O6 octahedra. In the twelfth W site, W(12) is bonded in a 4-coordinate geometry to one O(21), one O(23), one O(24), and one O(8) atom. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one W(1), and one W(4) atom to form a mixture of distorted edge and corner-sharing OCa2W2 trigonal pyramids. In the second O site, O(2) is bonded to one Ca(2), one W(1), one W(2), and one W(4) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(11)CaW3 tetrahedra, corners with two equivalent O(5)CaW3 tetrahedra, corners with two equivalent O(7)CaW3 tetrahedra, and  an edgeedge with one O(1)Ca2W2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(2), and one W(4) atom. In the fifth O site, O(5) is bonded to one Ca(5), one W(2), one W(4), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(11)CaW3 tetrahedra,  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(7)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid,  an edgeedge with one O(11)CaW3 tetrahedra, and  an edgeedge with one O(7)CaW3 tetrahedra. In the sixth O site, O(6) is bonded to one Ca(2), one W(3), one W(5), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the seventh O site, O(7) is bonded to one Ca(5), one W(1), one W(2), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(11)CaW3 tetrahedra,  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(5)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid,  an edgeedge with one O(11)CaW3 tetrahedra, and  an edgeedge with one O(5)CaW3 tetrahedra. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one W(1), one W(12), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded to one Ca(2), one W(3), one W(5), and one W(6) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the tenth O site, O(10) is bonded to one Ca(4), one W(3), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 trigonal pyramids. In the eleventh O site, O(11) is bonded to one Ca(5), one W(1), one W(4), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(5)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(7)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra, corners with two equivalent O(1)Ca2W2 trigonal pyramids,  an edgeedge with one O(5)CaW3 tetrahedra, and  an edgeedge with one O(7)CaW3 tetrahedra. In the twelfth O site, O(12) is bonded to one Ca(2), one W(5), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the thirteenth O site, O(13) is bonded to one Ca(6), one W(10), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the fourteenth O site, O(14) is bonded to one Ca(4), one W(10), one W(7), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the fifteenth O site, O(15) is bonded to one Ca(6), one W(10), one W(3), and one W(6) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the sixteenth O site, O(16) is bonded to one Ca(5), one W(3), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the seventeenth O site, O(17) is bonded to one Ca(1), one W(11), one W(7), and one W(9) atom to form distorted OCaW3 tetrahedra that share corners with three equivalent O(22)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid, corners with two equivalent O(21)CaW3 trigonal pyramids,  an edgeedge with one O(14)CaW3 tetrahedra,  an edgeedge with one O(18)CaW3 tetrahedra, and  an edgeedge with one O(20)CaW3 tetrahedra. In the eighteenth O site, O(18) is bonded to one Ca(4), one W(10), one W(11), and one W(7) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the nineteenth O site, O(19) is bonded to one Ca(6), one W(10), one W(3), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twentieth O site, O(20) is bonded to one Ca(4), one W(10), one W(11), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twenty-first O site, O(21) is bonded to one Ca(3), one W(11), one W(12), and one W(9) atom to form OCaW3 trigonal pyramids that share  a cornercorner with one O(14)CaW3 tetrahedra,  a cornercorner with one O(18)CaW3 tetrahedra, corners with two equivalent O(17)CaW3 tetrahedra, corners with two equivalent O(20)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid, and  an edgeedge with one O(22)CaW3 tetrahedra. In the twenty-second O site, O(22) is bonded to one Ca(6), one W(11), one W(7), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twenty-third O site, O(23) is bonded in a rectangular see-saw-like geometry to one Ca(3), one W(11), one W(12), and one W(7) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ca(3), one W(12), one W(7), and one W(9) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.566
_cell_length_b   6.663
_cell_length_c   16.226
_cell_angle_alpha   90.879
_cell_angle_beta   89.997
_cell_angle_gamma   119.287
_symmetry_Int_Tables_number   1
_cell_volume   619.079
_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  0.168  0.333  0.043  1.0
  Ca  Ca1  1  0.496  0.994  0.376  1.0
  Ca  Ca2  1  0.505  0.003  0.002  1.0
  Ca  Ca3  1  0.838  0.672  0.712  1.0
  Ca  Ca4  1  0.164  0.328  0.289  1.0
  Ca  Ca5  1  0.498  0.997  0.622  1.0
  W  W6  1  0.168  0.833  0.168  1.0
  W  W7  1  0.664  0.327  0.168  1.0
  W  W8  1  0.498  0.495  0.500  1.0
  W  W9  1  0.664  0.832  0.168  1.0
  W  W10  1  0.831  0.662  0.334  1.0
  W  W11  1  0.997  0.995  0.501  1.0
  W  W12  1  0.836  0.172  0.831  1.0
  W  W13  1  0.997  0.495  0.500  1.0
  W  W14  1  0.337  0.172  0.831  1.0
  W  W15  1  0.169  0.335  0.666  1.0
  W  W16  1  0.335  0.669  0.832  1.0
  W  W17  1  0.868  0.735  0.975  1.0
  O  O18  1  0.349  0.698  0.092  1.0
  O  O19  1  0.500  0.002  0.236  1.0
  O  O20  1  0.342  0.147  0.097  1.0
  O  O21  1  0.806  0.147  0.096  1.0
  O  O22  1  0.541  0.524  0.245  1.0
  O  O23  1  0.686  0.371  0.421  1.0
  O  O24  1  0.983  0.523  0.245  1.0
  O  O25  1  0.825  0.651  0.097  1.0
  O  O26  1  0.680  0.804  0.425  1.0
  O  O27  1  0.833  0.668  0.569  1.0
  O  O28  1  0.974  0.950  0.248  1.0
  O  O29  1  0.123  0.803  0.424  1.0
  O  O30  1  0.875  0.190  0.579  1.0
  O  O31  1  0.035  0.052  0.754  1.0
  O  O32  1  0.314  0.188  0.577  1.0
  O  O33  1  0.161  0.322  0.433  1.0
  O  O34  1  0.174  0.341  0.897  1.0
  O  O35  1  0.022  0.480  0.755  1.0
  O  O36  1  0.310  0.620  0.580  1.0
  O  O37  1  0.460  0.470  0.758  1.0
  O  O38  1  0.173  0.862  0.891  1.0
  O  O39  1  0.497  0.997  0.764  1.0
  O  O40  1  0.674  0.850  0.898  1.0
  O  O41  1  0.629  0.290  0.900  1.0
[/CIF]
.
The compound 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 W(11)O6 octahedra,  a cornercorner with one W(7)O6 octahedra,  a cornercorner with one W(9)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second Ca site, Ca(2) is bonded to one O(12), one O(2), one O(6), and one O(9) atom to form CaO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent W(3)O6 octahedra, corners with two equivalent W(6)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-62°. In the third Ca site, Ca(3) is bonded to one O(1), one O(21), one O(23), one O(24), one O(3), and one O(4) atom to form distorted CaO6 octahedra that share corners with three equivalent Ca(1)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(11)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(7)O6 octahedra, and  an edgeedge with one W(9)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(10), one O(14), one O(18), and one O(20) atom to form CaO4 tetrahedra that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent W(11)O6 octahedra, corners with two equivalent W(7)O6 octahedra, corners with two equivalent W(9)O6 octahedra, and corners with three equivalent W(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-64°. In the fifth Ca site, Ca(5) is bonded to one O(11), one O(16), one O(5), and one O(7) atom to form CaO4 tetrahedra that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(8)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, corners with two equivalent W(4)O6 octahedra, and corners with three equivalent W(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-63°. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(15), one O(19), and one O(22) atom to form CaO4 tetrahedra that share  a cornercorner with one W(11)O6 octahedra,  a cornercorner with one W(7)O6 octahedra,  a cornercorner with one W(9)O6 octahedra, corners with two equivalent W(3)O6 octahedra, corners with two equivalent W(6)O6 octahedra, corners with two equivalent W(8)O6 octahedra, and corners with three equivalent W(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-63°. There are twelve inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(2)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(4)O6 octahedra. In the third W site, W(3) is bonded to one O(10), one O(15), one O(16), one O(19), one O(6), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(6)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the fourth W site, W(4) is bonded to one O(1), one O(11), one O(2), one O(4), one O(5), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Ca(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Ca(5)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. In the fifth W site, W(5) is bonded to one O(11), one O(12), one O(5), one O(6), one O(7), and one O(9) atom to form WO6 octahedra that share corners with three equivalent Ca(2)O4 tetrahedra, corners with three equivalent Ca(5)O4 tetrahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one W(3)O6 octahedra,  an edgeedge with one W(4)O6 octahedra,  an edgeedge with one W(6)O6 octahedra, and  an edgeedge with one W(8)O6 octahedra. In the sixth W site, W(6) is bonded to one O(10), one O(12), one O(13), one O(15), one O(16), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(8)O6 octahedra. In the seventh W site, W(7) is bonded to one O(14), one O(17), one O(18), one O(22), one O(23), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(11)O6 octahedra, and edges with two equivalent W(9)O6 octahedra. In the eighth W site, W(8) is bonded to one O(10), one O(12), one O(13), one O(16), one O(19), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one Ca(4)O4 tetrahedra,  a cornercorner with one Ca(5)O4 tetrahedra, corners with two equivalent Ca(2)O4 tetrahedra, corners with two equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(10)O6 octahedra,  an edgeedge with one W(5)O6 octahedra, edges with two equivalent W(3)O6 octahedra, and edges with two equivalent W(6)O6 octahedra. In the ninth W site, W(9) is bonded to one O(14), one O(17), one O(20), one O(21), one O(22), and one O(24) atom to form WO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(11)O6 octahedra, and edges with two equivalent W(7)O6 octahedra. In the tenth W site, W(10) is bonded to one O(13), one O(14), one O(15), one O(18), one O(19), and one O(20) atom to form WO6 octahedra that share corners with three equivalent Ca(4)O4 tetrahedra, corners with three equivalent Ca(6)O4 tetrahedra,  an edgeedge with one W(11)O6 octahedra,  an edgeedge with one W(3)O6 octahedra,  an edgeedge with one W(6)O6 octahedra,  an edgeedge with one W(7)O6 octahedra,  an edgeedge with one W(8)O6 octahedra, and  an edgeedge with one W(9)O6 octahedra. In the eleventh W site, W(11) is bonded to one O(17), one O(18), one O(20), 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,  a cornercorner with one Ca(6)O4 tetrahedra, corners with two equivalent Ca(4)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one W(10)O6 octahedra, edges with two equivalent W(7)O6 octahedra, and edges with two equivalent W(9)O6 octahedra. In the twelfth W site, W(12) is bonded in a 4-coordinate geometry to one O(21), one O(23), one O(24), and one O(8) atom. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one W(1), and one W(4) atom to form a mixture of distorted edge and corner-sharing OCa2W2 trigonal pyramids. In the second O site, O(2) is bonded to one Ca(2), one W(1), one W(2), and one W(4) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(11)CaW3 tetrahedra, corners with two equivalent O(5)CaW3 tetrahedra, corners with two equivalent O(7)CaW3 tetrahedra, and  an edgeedge with one O(1)Ca2W2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(3), one W(2), and one W(4) atom. In the fifth O site, O(5) is bonded to one Ca(5), one W(2), one W(4), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(11)CaW3 tetrahedra,  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(7)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid,  an edgeedge with one O(11)CaW3 tetrahedra, and  an edgeedge with one O(7)CaW3 tetrahedra. In the sixth O site, O(6) is bonded to one Ca(2), one W(3), one W(5), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the seventh O site, O(7) is bonded to one Ca(5), one W(1), one W(2), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(11)CaW3 tetrahedra,  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(5)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid,  an edgeedge with one O(11)CaW3 tetrahedra, and  an edgeedge with one O(5)CaW3 tetrahedra. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one W(1), one W(12), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded to one Ca(2), one W(3), one W(5), and one W(6) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the tenth O site, O(10) is bonded to one Ca(4), one W(3), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 trigonal pyramids. In the eleventh O site, O(11) is bonded to one Ca(5), one W(1), one W(4), and one W(5) atom to form distorted OCaW3 tetrahedra that share  a cornercorner with one O(12)CaW3 tetrahedra,  a cornercorner with one O(16)CaW3 tetrahedra,  a cornercorner with one O(5)CaW3 tetrahedra,  a cornercorner with one O(6)CaW3 tetrahedra,  a cornercorner with one O(7)CaW3 tetrahedra,  a cornercorner with one O(9)CaW3 tetrahedra, corners with two equivalent O(2)CaW3 tetrahedra, corners with two equivalent O(1)Ca2W2 trigonal pyramids,  an edgeedge with one O(5)CaW3 tetrahedra, and  an edgeedge with one O(7)CaW3 tetrahedra. In the twelfth O site, O(12) is bonded to one Ca(2), one W(5), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the thirteenth O site, O(13) is bonded to one Ca(6), one W(10), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the fourteenth O site, O(14) is bonded to one Ca(4), one W(10), one W(7), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the fifteenth O site, O(15) is bonded to one Ca(6), one W(10), one W(3), and one W(6) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the sixteenth O site, O(16) is bonded to one Ca(5), one W(3), one W(6), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the seventeenth O site, O(17) is bonded to one Ca(1), one W(11), one W(7), and one W(9) atom to form distorted OCaW3 tetrahedra that share corners with three equivalent O(22)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid, corners with two equivalent O(21)CaW3 trigonal pyramids,  an edgeedge with one O(14)CaW3 tetrahedra,  an edgeedge with one O(18)CaW3 tetrahedra, and  an edgeedge with one O(20)CaW3 tetrahedra. In the eighteenth O site, O(18) is bonded to one Ca(4), one W(10), one W(11), and one W(7) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the nineteenth O site, O(19) is bonded to one Ca(6), one W(10), one W(3), and one W(8) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twentieth O site, O(20) is bonded to one Ca(4), one W(10), one W(11), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twenty-first O site, O(21) is bonded to one Ca(3), one W(11), one W(12), and one W(9) atom to form OCaW3 trigonal pyramids that share  a cornercorner with one O(14)CaW3 tetrahedra,  a cornercorner with one O(18)CaW3 tetrahedra, corners with two equivalent O(17)CaW3 tetrahedra, corners with two equivalent O(20)CaW3 tetrahedra,  a cornercorner with one O(1)Ca2W2 trigonal pyramid, and  an edgeedge with one O(22)CaW3 tetrahedra. In the twenty-second O site, O(22) is bonded to one Ca(6), one W(11), one W(7), and one W(9) atom to form a mixture of distorted edge and corner-sharing OCaW3 tetrahedra. In the twenty-third O site, O(23) is bonded in a rectangular see-saw-like geometry to one Ca(3), one W(11), one W(12), and one W(7) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Ca(3), one W(12), one W(7), and one W(9) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca(WO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.566
_cell_length_b   6.663
_cell_length_c   16.226
_cell_angle_alpha   90.879
_cell_angle_beta   89.997
_cell_angle_gamma   119.287
_symmetry_Int_Tables_number   1
_cell_volume   619.079
_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  0.168  0.333  0.043  1.0
  Ca  Ca1  1  0.496  0.994  0.376  1.0
  Ca  Ca2  1  0.505  0.003  0.002  1.0
  Ca  Ca3  1  0.838  0.672  0.712  1.0
  Ca  Ca4  1  0.164  0.328  0.289  1.0
  Ca  Ca5  1  0.498  0.997  0.622  1.0
  W  W6  1  0.168  0.833  0.168  1.0
  W  W7  1  0.664  0.327  0.168  1.0
  W  W8  1  0.498  0.495  0.500  1.0
  W  W9  1  0.664  0.832  0.168  1.0
  W  W10  1  0.831  0.662  0.334  1.0
  W  W11  1  0.997  0.995  0.501  1.0
  W  W12  1  0.836  0.172  0.831  1.0
  W  W13  1  0.997  0.495  0.500  1.0
  W  W14  1  0.337  0.172  0.831  1.0
  W  W15  1  0.169  0.335  0.666  1.0
  W  W16  1  0.335  0.669  0.832  1.0
  W  W17  1  0.868  0.735  0.975  1.0
  O  O18  1  0.349  0.698  0.092  1.0
  O  O19  1  0.500  0.002  0.236  1.0
  O  O20  1  0.342  0.147  0.097  1.0
  O  O21  1  0.806  0.147  0.096  1.0
  O  O22  1  0.541  0.524  0.245  1.0
  O  O23  1  0.686  0.371  0.421  1.0
  O  O24  1  0.983  0.523  0.245  1.0
  O  O25  1  0.825  0.651  0.097  1.0
  O  O26  1  0.680  0.804  0.425  1.0
  O  O27  1  0.833  0.668  0.569  1.0
  O  O28  1  0.974  0.950  0.248  1.0
  O  O29  1  0.123  0.803  0.424  1.0
  O  O30  1  0.875  0.190  0.579  1.0
  O  O31  1  0.035  0.052  0.754  1.0
  O  O32  1  0.314  0.188  0.577  1.0
  O  O33  1  0.161  0.322  0.433  1.0
  O  O34  1  0.174  0.341  0.897  1.0
  O  O35  1  0.022  0.480  0.755  1.0
  O  O36  1  0.310  0.620  0.580  1.0
  O  O37  1  0.460  0.470  0.758  1.0
  O  O38  1  0.173  0.862  0.891  1.0
  O  O39  1  0.497  0.997  0.764  1.0
  O  O40  1  0.674  0.850  0.898  1.0
  O  O41  1  0.629  0.290  0.900  1.0
[/CIF]
.