The crystal structure described by Ho2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. In the fourth Ho site, Ho(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Ho(3), two equivalent Ho(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OHo3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ho(4), two equivalent Ho(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ho(1), one Ho(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ho(2), one Ho(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Ho(2), one Ho(3), one Ho(4), and one Ge(1) atom to form distorted corner-sharing OHo3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ho(3), one Ho(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ho(1), one Ho(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Ho(2), one Ho(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Ho(2), one Ho(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ho(4), one Ge(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_Ho2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.806
_cell_length_b   6.828
_cell_length_c   12.405
_cell_angle_alpha   94.872
_cell_angle_beta   91.760
_cell_angle_gamma   91.873
_symmetry_Int_Tables_number   1
_cell_volume   573.683
_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  0.051  0.332  0.113  1.0
  Ho  Ho1  1  0.114  0.092  0.357  1.0
  Ho  Ho2  1  0.316  0.832  0.115  1.0
  Ho  Ho3  1  0.373  0.213  0.631  1.0
  Ho  Ho4  1  0.627  0.787  0.369  1.0
  Ho  Ho5  1  0.684  0.168  0.885  1.0
  Ho  Ho6  1  0.886  0.908  0.643  1.0
  Ho  Ho7  1  0.949  0.668  0.887  1.0
  Ge  Ge8  1  0.139  0.623  0.377  1.0
  Ge  Ge9  1  0.165  0.143  0.884  1.0
  Ge  Ge10  1  0.387  0.725  0.599  1.0
  Ge  Ge11  1  0.515  0.338  0.168  1.0
  Ge  Ge12  1  0.485  0.662  0.832  1.0
  Ge  Ge13  1  0.613  0.275  0.401  1.0
  Ge  Ge14  1  0.835  0.857  0.116  1.0
  Ge  Ge15  1  0.861  0.377  0.623  1.0
  O  O16  1  0.006  0.667  0.080  1.0
  O  O17  1  0.989  0.976  0.815  1.0
  O  O18  1  0.046  0.218  0.574  1.0
  O  O19  1  0.065  0.402  0.303  1.0
  O  O20  1  0.245  0.093  0.014  1.0
  O  O21  1  0.223  0.912  0.627  1.0
  O  O22  1  0.288  0.796  0.311  1.0
  O  O23  1  0.298  0.558  0.486  1.0
  O  O24  1  0.285  0.711  0.915  1.0
  O  O25  1  0.366  0.210  0.811  1.0
  O  O26  1  0.342  0.497  0.119  1.0
  O  O27  1  0.388  0.136  0.218  1.0
  O  O28  1  0.403  0.157  0.450  1.0
  O  O29  1  0.399  0.546  0.695  1.0
  O  O30  1  0.601  0.454  0.305  1.0
  O  O31  1  0.597  0.843  0.550  1.0
  O  O32  1  0.612  0.864  0.782  1.0
  O  O33  1  0.658  0.503  0.881  1.0
  O  O34  1  0.634  0.790  0.189  1.0
  O  O35  1  0.715  0.289  0.085  1.0
  O  O36  1  0.702  0.442  0.514  1.0
  O  O37  1  0.712  0.204  0.689  1.0
  O  O38  1  0.777  0.088  0.373  1.0
  O  O39  1  0.755  0.907  0.986  1.0
  O  O40  1  0.935  0.598  0.697  1.0
  O  O41  1  0.954  0.781  0.426  1.0
  O  O42  1  0.011  0.024  0.185  1.0
  O  O43  1  0.994  0.333  0.920  1.0
[/CIF]
.
The crystal structure described by Ho2Ge2O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to one O(11), one O(2), one O(4), one O(5), one O(9), and two equivalent O(1) atoms. In the second Ho site, Ho(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(4), one O(6), one O(7), and two equivalent O(3) atoms. In the third Ho site, Ho(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(2), one O(5), one O(7), and one O(9) atom. In the fourth Ho site, Ho(4) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(14), one O(3), one O(6), and one O(7) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(2), and one O(5) atom. In the third Ge site, Ge(3) is bonded to one O(13), one O(14), one O(6), and one O(8) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(11), one O(12), one O(14), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Ho(3), two equivalent Ho(1), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OHo3Ge tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ho(1), one Ho(2), one Ho(3), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ho(4), two equivalent Ho(2), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ho(1), one Ho(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Ho(2), one Ho(4), and one Ge(3) atom. In the seventh O site, O(7) is bonded to one Ho(2), one Ho(3), one Ho(4), and one Ge(1) atom to form distorted corner-sharing OHo3Ge tetrahedra. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ho(1), one Ho(3), and one Ge(4) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ho(3), one Ho(4), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Ho(1), one Ho(3), and one Ge(4) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Ho(2), one Ho(3), and one Ge(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Ho(2), one Ho(4), and one Ge(3) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ho(4), one Ge(3), and one Ge(4) atom. is represented by the CIF file [CIF]
data_Ho2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.806
_cell_length_b   6.828
_cell_length_c   12.405
_cell_angle_alpha   94.872
_cell_angle_beta   91.760
_cell_angle_gamma   91.873
_symmetry_Int_Tables_number   1
_cell_volume   573.683
_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  0.051  0.332  0.113  1.0
  Ho  Ho1  1  0.114  0.092  0.357  1.0
  Ho  Ho2  1  0.316  0.832  0.115  1.0
  Ho  Ho3  1  0.373  0.213  0.631  1.0
  Ho  Ho4  1  0.627  0.787  0.369  1.0
  Ho  Ho5  1  0.684  0.168  0.885  1.0
  Ho  Ho6  1  0.886  0.908  0.643  1.0
  Ho  Ho7  1  0.949  0.668  0.887  1.0
  Ge  Ge8  1  0.139  0.623  0.377  1.0
  Ge  Ge9  1  0.165  0.143  0.884  1.0
  Ge  Ge10  1  0.387  0.725  0.599  1.0
  Ge  Ge11  1  0.515  0.338  0.168  1.0
  Ge  Ge12  1  0.485  0.662  0.832  1.0
  Ge  Ge13  1  0.613  0.275  0.401  1.0
  Ge  Ge14  1  0.835  0.857  0.116  1.0
  Ge  Ge15  1  0.861  0.377  0.623  1.0
  O  O16  1  0.006  0.667  0.080  1.0
  O  O17  1  0.989  0.976  0.815  1.0
  O  O18  1  0.046  0.218  0.574  1.0
  O  O19  1  0.065  0.402  0.303  1.0
  O  O20  1  0.245  0.093  0.014  1.0
  O  O21  1  0.223  0.912  0.627  1.0
  O  O22  1  0.288  0.796  0.311  1.0
  O  O23  1  0.298  0.558  0.486  1.0
  O  O24  1  0.285  0.711  0.915  1.0
  O  O25  1  0.366  0.210  0.811  1.0
  O  O26  1  0.342  0.497  0.119  1.0
  O  O27  1  0.388  0.136  0.218  1.0
  O  O28  1  0.403  0.157  0.450  1.0
  O  O29  1  0.399  0.546  0.695  1.0
  O  O30  1  0.601  0.454  0.305  1.0
  O  O31  1  0.597  0.843  0.550  1.0
  O  O32  1  0.612  0.864  0.782  1.0
  O  O33  1  0.658  0.503  0.881  1.0
  O  O34  1  0.634  0.790  0.189  1.0
  O  O35  1  0.715  0.289  0.085  1.0
  O  O36  1  0.702  0.442  0.514  1.0
  O  O37  1  0.712  0.204  0.689  1.0
  O  O38  1  0.777  0.088  0.373  1.0
  O  O39  1  0.755  0.907  0.986  1.0
  O  O40  1  0.935  0.598  0.697  1.0
  O  O41  1  0.954  0.781  0.426  1.0
  O  O42  1  0.011  0.024  0.185  1.0
  O  O43  1  0.994  0.333  0.920  1.0
[/CIF]
.