The structure described by Ca2GeO4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form CaO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra, corners with four equivalent Ca(2)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-67°. In the second Ca site, Ca(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CaO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Ca(2)O6 octahedra, and edges with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-67°. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with four equivalent Ca(1)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra, and edges with two equivalent Ca(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Ca(1), two equivalent Ca(2), and one Ge(1) atom to form distorted corner-sharing OCa3Ge trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   6.791
_cell_length_c   11.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   406.905
_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  0.007  0.750  0.721  1.0
  Ca  Ca1  1  0.993  0.250  0.279  1.0
  Ca  Ca2  1  0.507  0.250  0.779  1.0
  Ca  Ca3  1  0.493  0.750  0.221  1.0
  Ca  Ca4  1  0.500  0.500  0.500  1.0
  Ca  Ca5  1  0.000  0.000  0.000  1.0
  Ca  Ca6  1  0.000  0.500  0.000  1.0
  Ca  Ca7  1  0.500  0.000  0.500  1.0
  Ge  Ge8  1  0.430  0.250  0.096  1.0
  Ge  Ge9  1  0.930  0.750  0.404  1.0
  Ge  Ge10  1  0.570  0.750  0.904  1.0
  Ge  Ge11  1  0.070  0.250  0.596  1.0
  O  O12  1  0.788  0.750  0.546  1.0
  O  O13  1  0.784  0.544  0.336  1.0
  O  O14  1  0.716  0.544  0.836  1.0
  O  O15  1  0.737  0.250  0.593  1.0
  O  O16  1  0.712  0.750  0.046  1.0
  O  O17  1  0.284  0.456  0.164  1.0
  O  O18  1  0.216  0.456  0.664  1.0
  O  O19  1  0.263  0.750  0.407  1.0
  O  O20  1  0.784  0.956  0.336  1.0
  O  O21  1  0.237  0.750  0.907  1.0
  O  O22  1  0.212  0.250  0.454  1.0
  O  O23  1  0.716  0.956  0.836  1.0
  O  O24  1  0.216  0.044  0.664  1.0
  O  O25  1  0.288  0.250  0.954  1.0
  O  O26  1  0.284  0.044  0.164  1.0
  O  O27  1  0.763  0.250  0.093  1.0
[/CIF]
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The structure described by Ca2GeO4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form CaO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra, corners with four equivalent Ca(2)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(2)O6 octahedra, and  an edgeedge with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-67°. In the second Ca site, Ca(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CaO6 octahedra that share corners with four equivalent Ca(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ca(1)O6 octahedra, edges with two equivalent Ca(2)O6 octahedra, and edges with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 59-67°. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with four equivalent Ca(1)O6 octahedra,  an edgeedge with one Ca(1)O6 octahedra, and edges with two equivalent Ca(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-62°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Ca(1), two equivalent Ca(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Ca(1), two equivalent Ca(2), and one Ge(1) atom to form distorted corner-sharing OCa3Ge trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.250
_cell_length_b   6.791
_cell_length_c   11.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   406.905
_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  0.007  0.750  0.721  1.0
  Ca  Ca1  1  0.993  0.250  0.279  1.0
  Ca  Ca2  1  0.507  0.250  0.779  1.0
  Ca  Ca3  1  0.493  0.750  0.221  1.0
  Ca  Ca4  1  0.500  0.500  0.500  1.0
  Ca  Ca5  1  0.000  0.000  0.000  1.0
  Ca  Ca6  1  0.000  0.500  0.000  1.0
  Ca  Ca7  1  0.500  0.000  0.500  1.0
  Ge  Ge8  1  0.430  0.250  0.096  1.0
  Ge  Ge9  1  0.930  0.750  0.404  1.0
  Ge  Ge10  1  0.570  0.750  0.904  1.0
  Ge  Ge11  1  0.070  0.250  0.596  1.0
  O  O12  1  0.788  0.750  0.546  1.0
  O  O13  1  0.784  0.544  0.336  1.0
  O  O14  1  0.716  0.544  0.836  1.0
  O  O15  1  0.737  0.250  0.593  1.0
  O  O16  1  0.712  0.750  0.046  1.0
  O  O17  1  0.284  0.456  0.164  1.0
  O  O18  1  0.216  0.456  0.664  1.0
  O  O19  1  0.263  0.750  0.407  1.0
  O  O20  1  0.784  0.956  0.336  1.0
  O  O21  1  0.237  0.750  0.907  1.0
  O  O22  1  0.212  0.250  0.454  1.0
  O  O23  1  0.716  0.956  0.836  1.0
  O  O24  1  0.216  0.044  0.664  1.0
  O  O25  1  0.288  0.250  0.954  1.0
  O  O26  1  0.284  0.044  0.164  1.0
  O  O27  1  0.763  0.250  0.093  1.0
[/CIF]
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