The structure described by K4UEu2(GeO4)4 crystallizes in the triclinic P-1 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(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded to one O(8), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms to form distorted KO7 pentagonal bipyramids that share corners with two equivalent U(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with three equivalent K(2)O7 pentagonal bipyramids,  an edgeedge with one Ge(1)O4 tetrahedra,  an edgeedge with one Ge(2)O4 tetrahedra, and  a faceface with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-62°. U(1) is bonded to two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms to form UO6 octahedra that share corners with four equivalent K(2)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and faces with two equivalent K(2)O7 pentagonal bipyramids. Eu(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(8), two equivalent O(5), and two equivalent O(6) atoms. 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(4) atom to form GeO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra, corners with two equivalent K(2)O7 pentagonal bipyramids,  a cornercorner with one Ge(2)O4 tetrahedra, and  an edgeedge with one K(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 47°. In the second Ge site, Ge(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra, corners with two equivalent K(2)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one K(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 48°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(2), one U(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Eu(1), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent K(1), one Eu(1), and one Ge(1) atom to form distorted edge-sharing OK2EuGe trigonal pyramids. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one Ge(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), two equivalent Eu(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), two equivalent Eu(1), and one Ge(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(2), one U(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(2), one U(1), and one Eu(1) atom. is represented by the CIF file [CIF]
data_K4Eu2U(GeO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.062
_cell_length_b   7.091
_cell_length_c   10.160
_cell_angle_alpha   99.154
_cell_angle_beta   93.923
_cell_angle_gamma   110.921
_symmetry_Int_Tables_number   1
_cell_volume   464.820
_cell_formula_units_Z   1
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  0.758  0.039  0.600  1.0
  K  K1  1  0.242  0.961  0.400  1.0
  K  K2  1  0.809  0.164  0.963  1.0
  K  K3  1  0.191  0.836  0.037  1.0
  Eu  Eu4  1  0.727  0.479  0.401  1.0
  Eu  Eu5  1  0.273  0.521  0.599  1.0
  U  U6  1  0.500  0.500  0.000  1.0
  Ge  Ge7  1  0.241  0.036  0.737  1.0
  Ge  Ge8  1  0.759  0.964  0.263  1.0
  Ge  Ge9  1  0.829  0.624  0.735  1.0
  Ge  Ge10  1  0.171  0.376  0.265  1.0
  O  O11  1  0.388  0.172  0.896  1.0
  O  O12  1  0.612  0.828  0.104  1.0
  O  O13  1  0.186  0.190  0.634  1.0
  O  O14  1  0.814  0.810  0.366  1.0
  O  O15  1  0.347  0.873  0.651  1.0
  O  O16  1  0.653  0.127  0.349  1.0
  O  O17  1  0.999  0.891  0.793  1.0
  O  O18  1  0.001  0.109  0.207  1.0
  O  O19  1  0.628  0.618  0.620  1.0
  O  O20  1  0.372  0.382  0.380  1.0
  O  O21  1  0.933  0.476  0.629  1.0
  O  O22  1  0.067  0.524  0.371  1.0
  O  O23  1  0.773  0.544  0.889  1.0
  O  O24  1  0.227  0.456  0.111  1.0
  O  O25  1  0.639  0.431  0.139  1.0
  O  O26  1  0.361  0.569  0.861  1.0
[/CIF]
.
The structure described by K4UEu2(GeO4)4 crystallizes in the triclinic P-1 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(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded to one O(8), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms to form distorted KO7 pentagonal bipyramids that share corners with two equivalent U(1)O6 octahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, edges with three equivalent K(2)O7 pentagonal bipyramids,  an edgeedge with one Ge(1)O4 tetrahedra,  an edgeedge with one Ge(2)O4 tetrahedra, and  a faceface with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-62°. U(1) is bonded to two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms to form UO6 octahedra that share corners with four equivalent K(2)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, and faces with two equivalent K(2)O7 pentagonal bipyramids. Eu(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(8), two equivalent O(5), and two equivalent O(6) atoms. 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(4) atom to form GeO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra, corners with two equivalent K(2)O7 pentagonal bipyramids,  a cornercorner with one Ge(2)O4 tetrahedra, and  an edgeedge with one K(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 47°. In the second Ge site, Ge(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra, corners with two equivalent K(2)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one K(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 48°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(2), one U(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Eu(1), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent K(1), one Eu(1), and one Ge(1) atom to form distorted edge-sharing OK2EuGe trigonal pyramids. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one Ge(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), two equivalent Eu(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), two equivalent Eu(1), and one Ge(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(2), one U(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(2), one U(1), and one Eu(1) atom. is represented by the CIF file [CIF]
data_K4Eu2U(GeO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.062
_cell_length_b   7.091
_cell_length_c   10.160
_cell_angle_alpha   99.154
_cell_angle_beta   93.923
_cell_angle_gamma   110.921
_symmetry_Int_Tables_number   1
_cell_volume   464.820
_cell_formula_units_Z   1
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  0.758  0.039  0.600  1.0
  K  K1  1  0.242  0.961  0.400  1.0
  K  K2  1  0.809  0.164  0.963  1.0
  K  K3  1  0.191  0.836  0.037  1.0
  Eu  Eu4  1  0.727  0.479  0.401  1.0
  Eu  Eu5  1  0.273  0.521  0.599  1.0
  U  U6  1  0.500  0.500  0.000  1.0
  Ge  Ge7  1  0.241  0.036  0.737  1.0
  Ge  Ge8  1  0.759  0.964  0.263  1.0
  Ge  Ge9  1  0.829  0.624  0.735  1.0
  Ge  Ge10  1  0.171  0.376  0.265  1.0
  O  O11  1  0.388  0.172  0.896  1.0
  O  O12  1  0.612  0.828  0.104  1.0
  O  O13  1  0.186  0.190  0.634  1.0
  O  O14  1  0.814  0.810  0.366  1.0
  O  O15  1  0.347  0.873  0.651  1.0
  O  O16  1  0.653  0.127  0.349  1.0
  O  O17  1  0.999  0.891  0.793  1.0
  O  O18  1  0.001  0.109  0.207  1.0
  O  O19  1  0.628  0.618  0.620  1.0
  O  O20  1  0.372  0.382  0.380  1.0
  O  O21  1  0.933  0.476  0.629  1.0
  O  O22  1  0.067  0.524  0.371  1.0
  O  O23  1  0.773  0.544  0.889  1.0
  O  O24  1  0.227  0.456  0.111  1.0
  O  O25  1  0.639  0.431  0.139  1.0
  O  O26  1  0.361  0.569  0.861  1.0
[/CIF]
.