The compound described by CaW5O7 crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are three inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(2), two equivalent O(3), and three equivalent O(1) atoms. In the second W site, W(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the third W site, W(3) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form distorted edge-sharing WO6 octahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one Ca(1), one W(3), two equivalent W(1), and two equivalent W(2) atoms. In the second O site, O(4) is bonded to two equivalent Ca(1) and two equivalent W(2) atoms to form OCa2W2 tetrahedra that share corners with eight equivalent O(2)Ca2W3 square pyramids, corners with two equivalent O(4)Ca2W2 tetrahedra, and edges with two equivalent O(2)Ca2W3 square pyramids. In the third O site, O(1) is bonded in a 6-coordinate geometry to one W(2), two equivalent W(3), and three equivalent W(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ca(1), one W(1), and two equivalent W(2) atoms to form distorted OCa2W3 square pyramids that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with four equivalent O(4)Ca2W2 tetrahedra, edges with three equivalent O(2)Ca2W3 square pyramids, and  an edgeedge with one O(4)Ca2W2 tetrahedra. is represented by the CIF card [CIF]
data_CaW5O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.638
_cell_length_b   5.638
_cell_length_c   18.670
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.264
_symmetry_Int_Tables_number   1
_cell_volume   329.577
_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  0.183  0.817  0.750  1.0
  Ca  Ca1  1  0.817  0.183  0.250  1.0
  W  W2  1  0.685  0.315  0.573  1.0
  W  W3  1  0.559  0.441  0.147  1.0
  W  W4  1  0.000  0.000  0.500  1.0
  W  W5  1  0.000  0.000  0.000  1.0
  W  W6  1  0.441  0.559  0.853  1.0
  W  W7  1  0.315  0.685  0.427  1.0
  W  W8  1  0.315  0.685  0.073  1.0
  W  W9  1  0.685  0.315  0.927  1.0
  W  W10  1  0.441  0.559  0.647  1.0
  W  W11  1  0.559  0.441  0.353  1.0
  O  O12  1  0.302  0.698  0.953  1.0
  O  O13  1  0.698  0.302  0.047  1.0
  O  O14  1  0.698  0.302  0.453  1.0
  O  O15  1  0.302  0.698  0.547  1.0
  O  O16  1  0.811  0.189  0.831  1.0
  O  O17  1  0.189  0.811  0.169  1.0
  O  O18  1  0.189  0.811  0.331  1.0
  O  O19  1  0.811  0.189  0.669  1.0
  O  O20  1  0.093  0.907  0.864  1.0
  O  O21  1  0.907  0.093  0.136  1.0
  O  O22  1  0.907  0.093  0.364  1.0
  O  O23  1  0.093  0.907  0.636  1.0
  O  O24  1  0.526  0.474  0.750  1.0
  O  O25  1  0.474  0.526  0.250  1.0
[/CIF]
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The compound described by CaW5O7 crystallizes in the orthorhombic Cmcm space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are three inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(2), two equivalent O(3), and three equivalent O(1) atoms. In the second W site, W(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the third W site, W(3) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form distorted edge-sharing WO6 octahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 6-coordinate geometry to one Ca(1), one W(3), two equivalent W(1), and two equivalent W(2) atoms. In the second O site, O(4) is bonded to two equivalent Ca(1) and two equivalent W(2) atoms to form OCa2W2 tetrahedra that share corners with eight equivalent O(2)Ca2W3 square pyramids, corners with two equivalent O(4)Ca2W2 tetrahedra, and edges with two equivalent O(2)Ca2W3 square pyramids. In the third O site, O(1) is bonded in a 6-coordinate geometry to one W(2), two equivalent W(3), and three equivalent W(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ca(1), one W(1), and two equivalent W(2) atoms to form distorted OCa2W3 square pyramids that share corners with two equivalent O(2)Ca2W3 square pyramids, corners with four equivalent O(4)Ca2W2 tetrahedra, edges with three equivalent O(2)Ca2W3 square pyramids, and  an edgeedge with one O(4)Ca2W2 tetrahedra. is represented by the CIF card [CIF]
data_CaW5O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.638
_cell_length_b   5.638
_cell_length_c   18.670
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.264
_symmetry_Int_Tables_number   1
_cell_volume   329.577
_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  0.183  0.817  0.750  1.0
  Ca  Ca1  1  0.817  0.183  0.250  1.0
  W  W2  1  0.685  0.315  0.573  1.0
  W  W3  1  0.559  0.441  0.147  1.0
  W  W4  1  0.000  0.000  0.500  1.0
  W  W5  1  0.000  0.000  0.000  1.0
  W  W6  1  0.441  0.559  0.853  1.0
  W  W7  1  0.315  0.685  0.427  1.0
  W  W8  1  0.315  0.685  0.073  1.0
  W  W9  1  0.685  0.315  0.927  1.0
  W  W10  1  0.441  0.559  0.647  1.0
  W  W11  1  0.559  0.441  0.353  1.0
  O  O12  1  0.302  0.698  0.953  1.0
  O  O13  1  0.698  0.302  0.047  1.0
  O  O14  1  0.698  0.302  0.453  1.0
  O  O15  1  0.302  0.698  0.547  1.0
  O  O16  1  0.811  0.189  0.831  1.0
  O  O17  1  0.189  0.811  0.169  1.0
  O  O18  1  0.189  0.811  0.331  1.0
  O  O19  1  0.811  0.189  0.669  1.0
  O  O20  1  0.093  0.907  0.864  1.0
  O  O21  1  0.907  0.093  0.136  1.0
  O  O22  1  0.907  0.093  0.364  1.0
  O  O23  1  0.093  0.907  0.636  1.0
  O  O24  1  0.526  0.474  0.750  1.0
  O  O25  1  0.474  0.526  0.250  1.0
[/CIF]
.