The crystal structure described by CaCu2(GeO3)4 crystallizes in the monoclinic C2 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Cu(2)O6 octahedra. In the second Cu site, Cu(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Cu(1)O6 octahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Cu(2)O6 octahedra, corners with two equivalent Cu(1)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Cu(1)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ca(1), one Cu(2), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Cu(1) and one Ge(1) atom. In the fifth O site, O(5) is bonded to one Ca(1), one Cu(1), one Cu(2), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OCaCu2Ge tetrahedra. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Cu(1), one Cu(2), and one Ge(2) atom. is represented by the CIF file [CIF]
data_CaCu2(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.480
_cell_length_b   6.751
_cell_length_c   6.751
_cell_angle_alpha   83.577
_cell_angle_beta   77.650
_cell_angle_gamma   77.650
_symmetry_Int_Tables_number   1
_cell_volume   237.737
_cell_formula_units_Z   1
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  0.750  0.308  0.692  1.0
  Cu  Cu1  1  0.750  0.904  0.096  1.0
  Cu  Cu2  1  0.250  0.090  0.910  1.0
  Ge  Ge3  1  0.778  0.388  0.195  1.0
  Ge  Ge4  1  0.722  0.805  0.612  1.0
  Ge  Ge5  1  0.211  0.618  0.811  1.0
  Ge  Ge6  1  0.289  0.189  0.382  1.0
  O  O7  1  0.530  0.323  0.398  1.0
  O  O8  1  0.970  0.602  0.677  1.0
  O  O9  1  0.490  0.653  0.625  1.0
  O  O10  1  0.010  0.375  0.347  1.0
  O  O11  1  0.170  0.095  0.631  1.0
  O  O12  1  0.330  0.369  0.905  1.0
  O  O13  1  0.806  0.922  0.371  1.0
  O  O14  1  0.694  0.629  0.078  1.0
  O  O15  1  0.874  0.195  0.016  1.0
  O  O16  1  0.626  0.984  0.805  1.0
  O  O17  1  0.114  0.824  0.972  1.0
  O  O18  1  0.386  0.028  0.176  1.0
[/CIF]
.
The crystal structure described by CaCu2(GeO3)4 crystallizes in the monoclinic C2 space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Cu(2)O6 octahedra. In the second Cu site, Cu(2) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with four equivalent Ge(2)O4 tetrahedra, and edges with two equivalent Cu(1)O6 octahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Cu(2)O6 octahedra, corners with two equivalent Cu(1)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Cu(1)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ge(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Ca(1), one Cu(2), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Cu(1) and one Ge(1) atom. In the fifth O site, O(5) is bonded to one Ca(1), one Cu(1), one Cu(2), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OCaCu2Ge tetrahedra. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Cu(1), one Cu(2), and one Ge(2) atom. is represented by the CIF file [CIF]
data_CaCu2(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.480
_cell_length_b   6.751
_cell_length_c   6.751
_cell_angle_alpha   83.577
_cell_angle_beta   77.650
_cell_angle_gamma   77.650
_symmetry_Int_Tables_number   1
_cell_volume   237.737
_cell_formula_units_Z   1
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  0.750  0.308  0.692  1.0
  Cu  Cu1  1  0.750  0.904  0.096  1.0
  Cu  Cu2  1  0.250  0.090  0.910  1.0
  Ge  Ge3  1  0.778  0.388  0.195  1.0
  Ge  Ge4  1  0.722  0.805  0.612  1.0
  Ge  Ge5  1  0.211  0.618  0.811  1.0
  Ge  Ge6  1  0.289  0.189  0.382  1.0
  O  O7  1  0.530  0.323  0.398  1.0
  O  O8  1  0.970  0.602  0.677  1.0
  O  O9  1  0.490  0.653  0.625  1.0
  O  O10  1  0.010  0.375  0.347  1.0
  O  O11  1  0.170  0.095  0.631  1.0
  O  O12  1  0.330  0.369  0.905  1.0
  O  O13  1  0.806  0.922  0.371  1.0
  O  O14  1  0.694  0.629  0.078  1.0
  O  O15  1  0.874  0.195  0.016  1.0
  O  O16  1  0.626  0.984  0.805  1.0
  O  O17  1  0.114  0.824  0.972  1.0
  O  O18  1  0.386  0.028  0.176  1.0
[/CIF]
.