The structure described by CaMo4O9 crystallizes in the tetragonal P4/n space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. Mo(1) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing MoO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mo(1) atoms to form a mixture of distorted corner and edge-sharing OMo4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one Mo(1) atom. In the third O site, O(3) is bonded to one Ca(1) and three equivalent Mo(1) atoms to form distorted OCaMo3 tetrahedra that share corners with three equivalent O(3)CaMo3 tetrahedra,  a cornercorner with one O(1)Mo4 trigonal pyramid, edges with three equivalent O(3)CaMo3 tetrahedra, and  an edgeedge with one O(1)Mo4 trigonal pyramid. is represented by the CIF card [CIF]
data_CaMo4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.804
_cell_length_b   8.804
_cell_length_c   5.079
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   393.689
_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  0.500  0.802  1.0
  Ca  Ca1  1  0.500  0.000  0.198  1.0
  Mo  Mo2  1  0.704  0.397  0.328  1.0
  Mo  Mo3  1  0.397  0.296  0.672  1.0
  Mo  Mo4  1  0.897  0.796  0.328  1.0
  Mo  Mo5  1  0.204  0.897  0.672  1.0
  Mo  Mo6  1  0.296  0.603  0.328  1.0
  Mo  Mo7  1  0.103  0.204  0.328  1.0
  Mo  Mo8  1  0.796  0.103  0.672  1.0
  Mo  Mo9  1  0.603  0.704  0.672  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.545  0.756  0.001  1.0
  O  O13  1  0.744  0.045  0.001  1.0
  O  O14  1  0.256  0.955  0.001  1.0
  O  O15  1  0.455  0.244  0.001  1.0
  O  O16  1  0.955  0.744  0.999  1.0
  O  O17  1  0.756  0.455  0.999  1.0
  O  O18  1  0.244  0.545  0.999  1.0
  O  O19  1  0.045  0.256  0.999  1.0
  O  O20  1  0.203  0.390  0.498  1.0
  O  O21  1  0.110  0.703  0.498  1.0
  O  O22  1  0.890  0.297  0.498  1.0
  O  O23  1  0.797  0.610  0.498  1.0
  O  O24  1  0.703  0.890  0.502  1.0
  O  O25  1  0.390  0.797  0.502  1.0
  O  O26  1  0.610  0.203  0.502  1.0
  O  O27  1  0.297  0.110  0.502  1.0
[/CIF]
.
The structure described by CaMo4O9 crystallizes in the tetragonal P4/n space group. Ca(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. Mo(1) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing MoO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mo(1) atoms to form a mixture of distorted corner and edge-sharing OMo4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one Mo(1) atom. In the third O site, O(3) is bonded to one Ca(1) and three equivalent Mo(1) atoms to form distorted OCaMo3 tetrahedra that share corners with three equivalent O(3)CaMo3 tetrahedra,  a cornercorner with one O(1)Mo4 trigonal pyramid, edges with three equivalent O(3)CaMo3 tetrahedra, and  an edgeedge with one O(1)Mo4 trigonal pyramid. is represented by the CIF card [CIF]
data_CaMo4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.804
_cell_length_b   8.804
_cell_length_c   5.079
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   393.689
_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  0.500  0.802  1.0
  Ca  Ca1  1  0.500  0.000  0.198  1.0
  Mo  Mo2  1  0.704  0.397  0.328  1.0
  Mo  Mo3  1  0.397  0.296  0.672  1.0
  Mo  Mo4  1  0.897  0.796  0.328  1.0
  Mo  Mo5  1  0.204  0.897  0.672  1.0
  Mo  Mo6  1  0.296  0.603  0.328  1.0
  Mo  Mo7  1  0.103  0.204  0.328  1.0
  Mo  Mo8  1  0.796  0.103  0.672  1.0
  Mo  Mo9  1  0.603  0.704  0.672  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.000  0.000  0.500  1.0
  O  O12  1  0.545  0.756  0.001  1.0
  O  O13  1  0.744  0.045  0.001  1.0
  O  O14  1  0.256  0.955  0.001  1.0
  O  O15  1  0.455  0.244  0.001  1.0
  O  O16  1  0.955  0.744  0.999  1.0
  O  O17  1  0.756  0.455  0.999  1.0
  O  O18  1  0.244  0.545  0.999  1.0
  O  O19  1  0.045  0.256  0.999  1.0
  O  O20  1  0.203  0.390  0.498  1.0
  O  O21  1  0.110  0.703  0.498  1.0
  O  O22  1  0.890  0.297  0.498  1.0
  O  O23  1  0.797  0.610  0.498  1.0
  O  O24  1  0.703  0.890  0.502  1.0
  O  O25  1  0.390  0.797  0.502  1.0
  O  O26  1  0.610  0.203  0.502  1.0
  O  O27  1  0.297  0.110  0.502  1.0
[/CIF]
.