The crystal structure described by Ho2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Ho(1) is bonded to two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms to form distorted HoO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Ho(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. 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 corners with five equivalent Ho(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ho(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ho(1) and one Ge(1) atom. In the third O site, O(3) is bonded to three equivalent Ho(1) and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OHo3Ge trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ge(1) atoms. is represented by the CIF file [CIF]
data_Ho2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.782
_cell_length_b   6.782
_cell_length_c   12.353
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   568.220
_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
  Ho  Ho0  1  0.853  0.625  0.885  1.0
  Ho  Ho1  1  0.353  0.875  0.865  1.0
  Ho  Ho2  1  0.375  0.147  0.615  1.0
  Ho  Ho3  1  0.647  0.125  0.365  1.0
  Ho  Ho4  1  0.147  0.375  0.385  1.0
  Ho  Ho5  1  0.125  0.647  0.635  1.0
  Ho  Ho6  1  0.625  0.853  0.115  1.0
  Ho  Ho7  1  0.875  0.353  0.135  1.0
  Ge  Ge8  1  0.400  0.348  0.131  1.0
  Ge  Ge9  1  0.652  0.600  0.369  1.0
  Ge  Ge10  1  0.600  0.652  0.631  1.0
  Ge  Ge11  1  0.100  0.848  0.119  1.0
  Ge  Ge12  1  0.848  0.100  0.881  1.0
  Ge  Ge13  1  0.152  0.900  0.381  1.0
  Ge  Ge14  1  0.900  0.152  0.619  1.0
  Ge  Ge15  1  0.348  0.400  0.869  1.0
  O  O16  1  0.357  0.182  0.794  1.0
  O  O17  1  0.078  0.967  0.623  1.0
  O  O18  1  0.682  0.143  0.544  1.0
  O  O19  1  0.661  0.936  0.929  1.0
  O  O20  1  0.339  0.064  0.429  1.0
  O  O21  1  0.436  0.839  0.679  1.0
  O  O22  1  0.533  0.578  0.873  1.0
  O  O23  1  0.422  0.467  0.627  1.0
  O  O24  1  0.197  0.803  0.250  1.0
  O  O25  1  0.578  0.533  0.127  1.0
  O  O26  1  0.303  0.303  0.000  1.0
  O  O27  1  0.922  0.033  0.123  1.0
  O  O28  1  0.143  0.682  0.456  1.0
  O  O29  1  0.936  0.661  0.071  1.0
  O  O30  1  0.857  0.318  0.956  1.0
  O  O31  1  0.033  0.922  0.877  1.0
  O  O32  1  0.161  0.564  0.821  1.0
  O  O33  1  0.318  0.857  0.044  1.0
  O  O34  1  0.643  0.818  0.294  1.0
  O  O35  1  0.182  0.357  0.206  1.0
  O  O36  1  0.564  0.161  0.179  1.0
  O  O37  1  0.818  0.643  0.706  1.0
  O  O38  1  0.967  0.078  0.377  1.0
  O  O39  1  0.064  0.339  0.571  1.0
  O  O40  1  0.697  0.697  0.500  1.0
  O  O41  1  0.839  0.436  0.321  1.0
  O  O42  1  0.803  0.197  0.750  1.0
  O  O43  1  0.467  0.422  0.373  1.0
[/CIF]
.
The crystal structure described by Ho2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Ho(1) is bonded to two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms to form distorted HoO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Ho(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. 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 corners with five equivalent Ho(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ho(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ho(1) and one Ge(1) atom. In the third O site, O(3) is bonded to three equivalent Ho(1) and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OHo3Ge trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Ge(1) atoms. is represented by the CIF file [CIF]
data_Ho2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.782
_cell_length_b   6.782
_cell_length_c   12.353
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   568.220
_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
  Ho  Ho0  1  0.853  0.625  0.885  1.0
  Ho  Ho1  1  0.353  0.875  0.865  1.0
  Ho  Ho2  1  0.375  0.147  0.615  1.0
  Ho  Ho3  1  0.647  0.125  0.365  1.0
  Ho  Ho4  1  0.147  0.375  0.385  1.0
  Ho  Ho5  1  0.125  0.647  0.635  1.0
  Ho  Ho6  1  0.625  0.853  0.115  1.0
  Ho  Ho7  1  0.875  0.353  0.135  1.0
  Ge  Ge8  1  0.400  0.348  0.131  1.0
  Ge  Ge9  1  0.652  0.600  0.369  1.0
  Ge  Ge10  1  0.600  0.652  0.631  1.0
  Ge  Ge11  1  0.100  0.848  0.119  1.0
  Ge  Ge12  1  0.848  0.100  0.881  1.0
  Ge  Ge13  1  0.152  0.900  0.381  1.0
  Ge  Ge14  1  0.900  0.152  0.619  1.0
  Ge  Ge15  1  0.348  0.400  0.869  1.0
  O  O16  1  0.357  0.182  0.794  1.0
  O  O17  1  0.078  0.967  0.623  1.0
  O  O18  1  0.682  0.143  0.544  1.0
  O  O19  1  0.661  0.936  0.929  1.0
  O  O20  1  0.339  0.064  0.429  1.0
  O  O21  1  0.436  0.839  0.679  1.0
  O  O22  1  0.533  0.578  0.873  1.0
  O  O23  1  0.422  0.467  0.627  1.0
  O  O24  1  0.197  0.803  0.250  1.0
  O  O25  1  0.578  0.533  0.127  1.0
  O  O26  1  0.303  0.303  0.000  1.0
  O  O27  1  0.922  0.033  0.123  1.0
  O  O28  1  0.143  0.682  0.456  1.0
  O  O29  1  0.936  0.661  0.071  1.0
  O  O30  1  0.857  0.318  0.956  1.0
  O  O31  1  0.033  0.922  0.877  1.0
  O  O32  1  0.161  0.564  0.821  1.0
  O  O33  1  0.318  0.857  0.044  1.0
  O  O34  1  0.643  0.818  0.294  1.0
  O  O35  1  0.182  0.357  0.206  1.0
  O  O36  1  0.564  0.161  0.179  1.0
  O  O37  1  0.818  0.643  0.706  1.0
  O  O38  1  0.967  0.078  0.377  1.0
  O  O39  1  0.064  0.339  0.571  1.0
  O  O40  1  0.697  0.697  0.500  1.0
  O  O41  1  0.839  0.436  0.321  1.0
  O  O42  1  0.803  0.197  0.750  1.0
  O  O43  1  0.467  0.422  0.373  1.0
[/CIF]
.