The structure described by CaO crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to five equivalent O(1) atoms to form a mixture of corner and edge-sharing CaO5 trigonal bipyramids. O(1) is bonded to five equivalent Ca(1) atoms to form a mixture of corner and edge-sharing OCa5 trigonal bipyramids. is represented by the CIF card [CIF]
data_CaO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.992
_cell_length_b   3.992
_cell_length_c   4.785
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   66.035
_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  0.333  0.667  1.000  1.0
  Ca  Ca1  1  0.667  0.333  0.500  1.0
  O  O2  1  0.333  0.667  0.500  1.0
  O  O3  1  0.667  0.333  1.000  1.0
[/CIF]
.
The structure described by CaO crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to five equivalent O(1) atoms to form a mixture of corner and edge-sharing CaO5 trigonal bipyramids. O(1) is bonded to five equivalent Ca(1) atoms to form a mixture of corner and edge-sharing OCa5 trigonal bipyramids. is represented by the CIF card [CIF]
data_CaO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.992
_cell_length_b   3.992
_cell_length_c   4.785
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   66.035
_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  0.333  0.667  1.000  1.0
  Ca  Ca1  1  0.667  0.333  0.500  1.0
  O  O2  1  0.333  0.667  0.500  1.0
  O  O3  1  0.667  0.333  1.000  1.0
[/CIF]
.