The crystal structure described by CaCuGe2O6 crystallizes in the monoclinic P2_1/c space group. Ca(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms. Cu(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(6), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing GeO5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), two equivalent Cu(1), and one Ge(1) atom. In the second O site, O(6) is bonded to one Ca(1), two equivalent Cu(1), and one Ge(2) atom to form distorted OCaCu2Ge tetrahedra that share corners with two equivalent O(6)CaCu2Ge tetrahedra and corners with four equivalent O(1)Ca2Ge2 tetrahedra. In the third O site, O(1) is bonded to two equivalent Ca(1) and two equivalent Ge(2) atoms to form distorted OCa2Ge2 tetrahedra that share corners with four equivalent O(6)CaCu2Ge tetrahedra and edges with two equivalent O(1)Ca2Ge2 tetrahedra. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Ca(1) and two equivalent Ge(1) atoms. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), one Cu(1), and two equivalent Ge(2) atoms. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(1), one Cu(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaCu(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.343
_cell_length_b   5.260
_cell_length_c   10.260
_cell_angle_alpha   76.297
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   489.847
_cell_formula_units_Z   4
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  0.454  0.530  0.285  1.0
  Ca  Ca1  1  0.954  0.970  0.715  1.0
  Ca  Ca2  1  0.546  0.470  0.715  1.0
  Ca  Ca3  1  0.046  0.030  0.285  1.0
  Cu  Cu4  1  0.659  0.029  0.225  1.0
  Cu  Cu5  1  0.159  0.471  0.775  1.0
  Cu  Cu6  1  0.341  0.971  0.775  1.0
  Cu  Cu7  1  0.841  0.529  0.225  1.0
  Ge  Ge8  1  0.350  0.155  0.050  1.0
  Ge  Ge9  1  0.850  0.345  0.950  1.0
  Ge  Ge10  1  0.650  0.845  0.950  1.0
  Ge  Ge11  1  0.150  0.655  0.050  1.0
  Ge  Ge12  1  0.351  0.918  0.494  1.0
  Ge  Ge13  1  0.851  0.582  0.506  1.0
  Ge  Ge14  1  0.649  0.082  0.506  1.0
  Ge  Ge15  1  0.149  0.418  0.494  1.0
  O  O16  1  0.251  0.692  0.401  1.0
  O  O17  1  0.751  0.808  0.599  1.0
  O  O18  1  0.749  0.308  0.599  1.0
  O  O19  1  0.249  0.192  0.401  1.0
  O  O20  1  0.307  0.809  0.103  1.0
  O  O21  1  0.807  0.691  0.897  1.0
  O  O22  1  0.693  0.191  0.897  1.0
  O  O23  1  0.193  0.309  0.103  1.0
  O  O24  1  0.978  0.325  0.435  1.0
  O  O25  1  0.478  0.175  0.565  1.0
  O  O26  1  0.022  0.675  0.565  1.0
  O  O27  1  0.522  0.825  0.435  1.0
  O  O28  1  0.015  0.729  0.150  1.0
  O  O29  1  0.515  0.771  0.850  1.0
  O  O30  1  0.985  0.271  0.850  1.0
  O  O31  1  0.485  0.229  0.150  1.0
  O  O32  1  0.366  0.239  0.874  1.0
  O  O33  1  0.866  0.261  0.126  1.0
  O  O34  1  0.634  0.761  0.126  1.0
  O  O35  1  0.134  0.739  0.874  1.0
  O  O36  1  0.321  0.722  0.662  1.0
  O  O37  1  0.821  0.778  0.338  1.0
  O  O38  1  0.679  0.278  0.338  1.0
  O  O39  1  0.179  0.222  0.662  1.0
[/CIF]
.
The crystal structure described by CaCuGe2O6 crystallizes in the monoclinic P2_1/c space group. Ca(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms. Cu(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(6), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing GeO5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), two equivalent Cu(1), and one Ge(1) atom. In the second O site, O(6) is bonded to one Ca(1), two equivalent Cu(1), and one Ge(2) atom to form distorted OCaCu2Ge tetrahedra that share corners with two equivalent O(6)CaCu2Ge tetrahedra and corners with four equivalent O(1)Ca2Ge2 tetrahedra. In the third O site, O(1) is bonded to two equivalent Ca(1) and two equivalent Ge(2) atoms to form distorted OCa2Ge2 tetrahedra that share corners with four equivalent O(6)CaCu2Ge tetrahedra and edges with two equivalent O(1)Ca2Ge2 tetrahedra. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Ca(1) and two equivalent Ge(1) atoms. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), one Cu(1), and two equivalent Ge(2) atoms. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(1), one Cu(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaCu(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.343
_cell_length_b   5.260
_cell_length_c   10.260
_cell_angle_alpha   76.297
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   489.847
_cell_formula_units_Z   4
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  0.454  0.530  0.285  1.0
  Ca  Ca1  1  0.954  0.970  0.715  1.0
  Ca  Ca2  1  0.546  0.470  0.715  1.0
  Ca  Ca3  1  0.046  0.030  0.285  1.0
  Cu  Cu4  1  0.659  0.029  0.225  1.0
  Cu  Cu5  1  0.159  0.471  0.775  1.0
  Cu  Cu6  1  0.341  0.971  0.775  1.0
  Cu  Cu7  1  0.841  0.529  0.225  1.0
  Ge  Ge8  1  0.350  0.155  0.050  1.0
  Ge  Ge9  1  0.850  0.345  0.950  1.0
  Ge  Ge10  1  0.650  0.845  0.950  1.0
  Ge  Ge11  1  0.150  0.655  0.050  1.0
  Ge  Ge12  1  0.351  0.918  0.494  1.0
  Ge  Ge13  1  0.851  0.582  0.506  1.0
  Ge  Ge14  1  0.649  0.082  0.506  1.0
  Ge  Ge15  1  0.149  0.418  0.494  1.0
  O  O16  1  0.251  0.692  0.401  1.0
  O  O17  1  0.751  0.808  0.599  1.0
  O  O18  1  0.749  0.308  0.599  1.0
  O  O19  1  0.249  0.192  0.401  1.0
  O  O20  1  0.307  0.809  0.103  1.0
  O  O21  1  0.807  0.691  0.897  1.0
  O  O22  1  0.693  0.191  0.897  1.0
  O  O23  1  0.193  0.309  0.103  1.0
  O  O24  1  0.978  0.325  0.435  1.0
  O  O25  1  0.478  0.175  0.565  1.0
  O  O26  1  0.022  0.675  0.565  1.0
  O  O27  1  0.522  0.825  0.435  1.0
  O  O28  1  0.015  0.729  0.150  1.0
  O  O29  1  0.515  0.771  0.850  1.0
  O  O30  1  0.985  0.271  0.850  1.0
  O  O31  1  0.485  0.229  0.150  1.0
  O  O32  1  0.366  0.239  0.874  1.0
  O  O33  1  0.866  0.261  0.126  1.0
  O  O34  1  0.634  0.761  0.126  1.0
  O  O35  1  0.134  0.739  0.874  1.0
  O  O36  1  0.321  0.722  0.662  1.0
  O  O37  1  0.821  0.778  0.338  1.0
  O  O38  1  0.679  0.278  0.338  1.0
  O  O39  1  0.179  0.222  0.662  1.0
[/CIF]
.