The crystal structure described by Ca5(GeO5)2 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form CaO6 octahedra that share corners with four equivalent Ca(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-64°. In the second Ca site, Ca(2) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form CaO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with two equivalent Ca(2)O6 octahedra, corners with four equivalent Ca(3)O6 octahedra, corners with three equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-64°. In the third Ca site, Ca(3) is bonded to one O(1), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form CaO6 octahedra that share corners with two equivalent Ca(3)O6 octahedra, corners with four equivalent Ca(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-66°. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share  a cornercorner with one Ca(1)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(2)O6 octahedra, and  an edgeedge with one Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-61°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Ca(3), and one Ge(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one Ge(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(3), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Ge(1) atom to form distorted corner-sharing OCa3Ge tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(2) and two equivalent Ca(3) atoms. is represented by the CIF file [CIF]
data_Ca5(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.265
_cell_length_b   9.038
_cell_length_c   11.695
_cell_angle_alpha   71.067
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   526.372
_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  0.500  0.000  0.500  1.0
  Ca  Ca1  1  0.000  0.000  0.000  1.0
  Ca  Ca2  1  0.500  0.809  0.829  1.0
  Ca  Ca3  1  1.000  0.191  0.671  1.0
  Ca  Ca4  1  0.500  0.191  0.171  1.0
  Ca  Ca5  1  0.000  0.809  0.329  1.0
  Ca  Ca6  1  0.506  0.580  0.618  1.0
  Ca  Ca7  1  0.006  0.420  0.882  1.0
  Ca  Ca8  1  0.494  0.420  0.382  1.0
  Ca  Ca9  1  0.994  0.580  0.118  1.0
  Ge  Ge10  1  0.068  0.799  0.645  1.0
  Ge  Ge11  1  0.568  0.201  0.855  1.0
  Ge  Ge12  1  0.932  0.201  0.355  1.0
  Ge  Ge13  1  0.432  0.799  0.145  1.0
  O  O14  1  0.216  0.793  0.507  1.0
  O  O15  1  0.716  0.207  0.993  1.0
  O  O16  1  0.784  0.207  0.493  1.0
  O  O17  1  0.284  0.793  0.007  1.0
  O  O18  1  0.216  0.966  0.668  1.0
  O  O19  1  0.716  0.034  0.832  1.0
  O  O20  1  0.784  0.034  0.332  1.0
  O  O21  1  0.284  0.966  0.168  1.0
  O  O22  1  0.213  0.637  0.758  1.0
  O  O23  1  0.713  0.363  0.742  1.0
  O  O24  1  0.787  0.363  0.242  1.0
  O  O25  1  0.287  0.637  0.258  1.0
  O  O26  1  0.734  0.799  0.647  1.0
  O  O27  1  0.234  0.201  0.853  1.0
  O  O28  1  0.266  0.201  0.353  1.0
  O  O29  1  0.766  0.799  0.147  1.0
  O  O30  1  0.764  0.604  0.940  1.0
  O  O31  1  0.264  0.396  0.560  1.0
  O  O32  1  0.236  0.396  0.060  1.0
  O  O33  1  0.736  0.604  0.440  1.0
[/CIF]
.
The crystal structure described by Ca5(GeO5)2 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form CaO6 octahedra that share corners with four equivalent Ca(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-64°. In the second Ca site, Ca(2) is bonded to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms to form CaO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with two equivalent Ca(2)O6 octahedra, corners with four equivalent Ca(3)O6 octahedra, corners with three equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-64°. In the third Ca site, Ca(3) is bonded to one O(1), one O(4), two equivalent O(3), and two equivalent O(5) atoms to form CaO6 octahedra that share corners with two equivalent Ca(3)O6 octahedra, corners with four equivalent Ca(2)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-66°. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share  a cornercorner with one Ca(1)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra,  an edgeedge with one Ca(2)O6 octahedra, and  an edgeedge with one Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-61°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Ca(3), and one Ge(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one Ge(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(3), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Ge(1) atom to form distorted corner-sharing OCa3Ge tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(2) and two equivalent Ca(3) atoms. is represented by the CIF file [CIF]
data_Ca5(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.265
_cell_length_b   9.038
_cell_length_c   11.695
_cell_angle_alpha   71.067
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   526.372
_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  0.500  0.000  0.500  1.0
  Ca  Ca1  1  0.000  0.000  0.000  1.0
  Ca  Ca2  1  0.500  0.809  0.829  1.0
  Ca  Ca3  1  1.000  0.191  0.671  1.0
  Ca  Ca4  1  0.500  0.191  0.171  1.0
  Ca  Ca5  1  0.000  0.809  0.329  1.0
  Ca  Ca6  1  0.506  0.580  0.618  1.0
  Ca  Ca7  1  0.006  0.420  0.882  1.0
  Ca  Ca8  1  0.494  0.420  0.382  1.0
  Ca  Ca9  1  0.994  0.580  0.118  1.0
  Ge  Ge10  1  0.068  0.799  0.645  1.0
  Ge  Ge11  1  0.568  0.201  0.855  1.0
  Ge  Ge12  1  0.932  0.201  0.355  1.0
  Ge  Ge13  1  0.432  0.799  0.145  1.0
  O  O14  1  0.216  0.793  0.507  1.0
  O  O15  1  0.716  0.207  0.993  1.0
  O  O16  1  0.784  0.207  0.493  1.0
  O  O17  1  0.284  0.793  0.007  1.0
  O  O18  1  0.216  0.966  0.668  1.0
  O  O19  1  0.716  0.034  0.832  1.0
  O  O20  1  0.784  0.034  0.332  1.0
  O  O21  1  0.284  0.966  0.168  1.0
  O  O22  1  0.213  0.637  0.758  1.0
  O  O23  1  0.713  0.363  0.742  1.0
  O  O24  1  0.787  0.363  0.242  1.0
  O  O25  1  0.287  0.637  0.258  1.0
  O  O26  1  0.734  0.799  0.647  1.0
  O  O27  1  0.234  0.201  0.853  1.0
  O  O28  1  0.266  0.201  0.353  1.0
  O  O29  1  0.766  0.799  0.147  1.0
  O  O30  1  0.764  0.604  0.940  1.0
  O  O31  1  0.264  0.396  0.560  1.0
  O  O32  1  0.236  0.396  0.060  1.0
  O  O33  1  0.736  0.604  0.440  1.0
[/CIF]
.