The material described by K2Nd4Ge4O17 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(7), two equivalent O(6), two equivalent O(8), and two equivalent O(9) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(4), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(2), one O(5), one O(6), one O(8), two equivalent O(1), and two equivalent O(3) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one K(1), two equivalent Nd(2), and one O(4) atom. In the second O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one Nd(1), one Nd(2), and one Ge(2) atom. In the third O site, O(9) is bonded in a distorted bent 120 degrees geometry to one K(1), one Nd(2), one Ge(1), and one Ge(2) atom. In the fourth O site, O(10) is bonded in a 3-coordinate geometry to one K(2) and two equivalent Ge(2) atoms. In the fifth O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Nd(1) and one Ge(1) atom. In the sixth O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one Nd(1), one Nd(2), and one Ge(1) atom. In the seventh O site, O(3) is bonded in a 4-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Ge(1) atom. In the eighth O site, O(4) is bonded to one K(2), two equivalent Nd(2), and one O(7) atom to form distorted corner-sharing OKNd2O trigonal pyramids. In the ninth O site, O(5) is bonded in a 3-coordinate geometry to one Nd(1), one Nd(2), and one Ge(2) atom. In the tenth O site, O(6) is bonded to one K(1), one K(2), one Nd(1), and one Nd(2) atom to form distorted OK2Nd2 tetrahedra that share corners with two equivalent O(4)KNd2O trigonal pyramids and  an edgeedge with one O(6)K2Nd2 tetrahedra. is represented by the CIF file [CIF]
data_K2Nd4Ge4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.462
_cell_length_b   6.885
_cell_length_c   7.104
_cell_angle_alpha   64.834
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   817.292
_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
  K  K0  1  0.250  0.727  0.003  1.0
  K  K1  1  0.750  0.273  0.997  1.0
  K  K2  1  0.250  0.721  0.555  1.0
  K  K3  1  0.750  0.279  0.445  1.0
  Nd  Nd4  1  0.037  0.713  0.729  1.0
  Nd  Nd5  1  0.537  0.287  0.271  1.0
  Nd  Nd6  1  0.463  0.713  0.729  1.0
  Nd  Nd7  1  0.963  0.287  0.271  1.0
  Nd  Nd8  1  0.877  0.776  0.335  1.0
  Nd  Nd9  1  0.377  0.224  0.665  1.0
  Nd  Nd10  1  0.623  0.776  0.335  1.0
  Nd  Nd11  1  0.123  0.224  0.665  1.0
  Ge  Ge12  1  0.440  0.780  0.236  1.0
  Ge  Ge13  1  0.940  0.220  0.764  1.0
  Ge  Ge14  1  0.060  0.780  0.236  1.0
  Ge  Ge15  1  0.560  0.220  0.764  1.0
  Ge  Ge16  1  0.157  0.205  0.132  1.0
  Ge  Ge17  1  0.657  0.795  0.868  1.0
  Ge  Ge18  1  0.343  0.205  0.132  1.0
  Ge  Ge19  1  0.843  0.795  0.868  1.0
  O  O20  1  0.018  0.660  0.088  1.0
  O  O21  1  0.518  0.340  0.912  1.0
  O  O22  1  0.094  0.593  0.473  1.0
  O  O23  1  0.594  0.407  0.527  1.0
  O  O24  1  0.505  0.910  0.331  1.0
  O  O25  1  0.005  0.090  0.669  1.0
  O  O26  1  0.250  0.321  0.545  1.0
  O  O27  1  0.750  0.679  0.455  1.0
  O  O28  1  0.104  0.230  0.322  1.0
  O  O29  1  0.604  0.770  0.678  1.0
  O  O30  1  0.144  0.883  0.698  1.0
  O  O31  1  0.644  0.117  0.302  1.0
  O  O32  1  0.750  0.820  0.248  1.0
  O  O33  1  0.250  0.180  0.752  1.0
  O  O34  1  0.995  0.910  0.331  1.0
  O  O35  1  0.495  0.090  0.669  1.0
  O  O36  1  0.482  0.660  0.088  1.0
  O  O37  1  0.982  0.340  0.912  1.0
  O  O38  1  0.852  0.582  0.111  1.0
  O  O39  1  0.352  0.418  0.889  1.0
  O  O40  1  0.648  0.582  0.111  1.0
  O  O41  1  0.148  0.418  0.889  1.0
  O  O42  1  0.356  0.883  0.698  1.0
  O  O43  1  0.856  0.117  0.302  1.0
  O  O44  1  0.406  0.593  0.473  1.0
  O  O45  1  0.906  0.407  0.527  1.0
  O  O46  1  0.396  0.230  0.322  1.0
  O  O47  1  0.896  0.770  0.678  1.0
  O  O48  1  0.371  0.971  0.083  1.0
  O  O49  1  0.871  0.029  0.917  1.0
  O  O50  1  0.250  0.131  0.217  1.0
  O  O51  1  0.750  0.869  0.783  1.0
  O  O52  1  0.129  0.971  0.083  1.0
  O  O53  1  0.629  0.029  0.917  1.0
[/CIF]
.
The material described by K2Nd4Ge4O17 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(7), two equivalent O(6), two equivalent O(8), and two equivalent O(9) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(4), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(2), one O(5), one O(6), one O(8), two equivalent O(1), and two equivalent O(3) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(9) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form corner-sharing GeO4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one K(1), two equivalent Nd(2), and one O(4) atom. In the second O site, O(8) is bonded in a 1-coordinate geometry to one K(1), one K(2), one Nd(1), one Nd(2), and one Ge(2) atom. In the third O site, O(9) is bonded in a distorted bent 120 degrees geometry to one K(1), one Nd(2), one Ge(1), and one Ge(2) atom. In the fourth O site, O(10) is bonded in a 3-coordinate geometry to one K(2) and two equivalent Ge(2) atoms. In the fifth O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Nd(1) and one Ge(1) atom. In the sixth O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one Nd(1), one Nd(2), and one Ge(1) atom. In the seventh O site, O(3) is bonded in a 4-coordinate geometry to one Nd(2), two equivalent Nd(1), and one Ge(1) atom. In the eighth O site, O(4) is bonded to one K(2), two equivalent Nd(2), and one O(7) atom to form distorted corner-sharing OKNd2O trigonal pyramids. In the ninth O site, O(5) is bonded in a 3-coordinate geometry to one Nd(1), one Nd(2), and one Ge(2) atom. In the tenth O site, O(6) is bonded to one K(1), one K(2), one Nd(1), and one Nd(2) atom to form distorted OK2Nd2 tetrahedra that share corners with two equivalent O(4)KNd2O trigonal pyramids and  an edgeedge with one O(6)K2Nd2 tetrahedra. is represented by the CIF file [CIF]
data_K2Nd4Ge4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.462
_cell_length_b   6.885
_cell_length_c   7.104
_cell_angle_alpha   64.834
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   817.292
_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
  K  K0  1  0.250  0.727  0.003  1.0
  K  K1  1  0.750  0.273  0.997  1.0
  K  K2  1  0.250  0.721  0.555  1.0
  K  K3  1  0.750  0.279  0.445  1.0
  Nd  Nd4  1  0.037  0.713  0.729  1.0
  Nd  Nd5  1  0.537  0.287  0.271  1.0
  Nd  Nd6  1  0.463  0.713  0.729  1.0
  Nd  Nd7  1  0.963  0.287  0.271  1.0
  Nd  Nd8  1  0.877  0.776  0.335  1.0
  Nd  Nd9  1  0.377  0.224  0.665  1.0
  Nd  Nd10  1  0.623  0.776  0.335  1.0
  Nd  Nd11  1  0.123  0.224  0.665  1.0
  Ge  Ge12  1  0.440  0.780  0.236  1.0
  Ge  Ge13  1  0.940  0.220  0.764  1.0
  Ge  Ge14  1  0.060  0.780  0.236  1.0
  Ge  Ge15  1  0.560  0.220  0.764  1.0
  Ge  Ge16  1  0.157  0.205  0.132  1.0
  Ge  Ge17  1  0.657  0.795  0.868  1.0
  Ge  Ge18  1  0.343  0.205  0.132  1.0
  Ge  Ge19  1  0.843  0.795  0.868  1.0
  O  O20  1  0.018  0.660  0.088  1.0
  O  O21  1  0.518  0.340  0.912  1.0
  O  O22  1  0.094  0.593  0.473  1.0
  O  O23  1  0.594  0.407  0.527  1.0
  O  O24  1  0.505  0.910  0.331  1.0
  O  O25  1  0.005  0.090  0.669  1.0
  O  O26  1  0.250  0.321  0.545  1.0
  O  O27  1  0.750  0.679  0.455  1.0
  O  O28  1  0.104  0.230  0.322  1.0
  O  O29  1  0.604  0.770  0.678  1.0
  O  O30  1  0.144  0.883  0.698  1.0
  O  O31  1  0.644  0.117  0.302  1.0
  O  O32  1  0.750  0.820  0.248  1.0
  O  O33  1  0.250  0.180  0.752  1.0
  O  O34  1  0.995  0.910  0.331  1.0
  O  O35  1  0.495  0.090  0.669  1.0
  O  O36  1  0.482  0.660  0.088  1.0
  O  O37  1  0.982  0.340  0.912  1.0
  O  O38  1  0.852  0.582  0.111  1.0
  O  O39  1  0.352  0.418  0.889  1.0
  O  O40  1  0.648  0.582  0.111  1.0
  O  O41  1  0.148  0.418  0.889  1.0
  O  O42  1  0.356  0.883  0.698  1.0
  O  O43  1  0.856  0.117  0.302  1.0
  O  O44  1  0.406  0.593  0.473  1.0
  O  O45  1  0.906  0.407  0.527  1.0
  O  O46  1  0.396  0.230  0.322  1.0
  O  O47  1  0.896  0.770  0.678  1.0
  O  O48  1  0.371  0.971  0.083  1.0
  O  O49  1  0.871  0.029  0.917  1.0
  O  O50  1  0.250  0.131  0.217  1.0
  O  O51  1  0.750  0.869  0.783  1.0
  O  O52  1  0.129  0.971  0.083  1.0
  O  O53  1  0.629  0.029  0.917  1.0
[/CIF]
.