The material structure described by KUSiO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(7), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. U(1) is bonded to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent Si(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. Si(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), two equivalent U(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one U(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1), one Si(1), and one O(7) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one K(1) and one O(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KUSiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.035
_cell_length_b   6.765
_cell_length_c   7.007
_cell_angle_alpha   75.756
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   323.202
_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  0.053  0.779  0.560  1.0
  K  K1  1  0.553  0.221  0.440  1.0
  U  U2  1  0.743  0.865  0.023  1.0
  U  U3  1  0.243  0.135  0.977  1.0
  Si  Si4  1  0.741  0.352  0.928  1.0
  Si  Si5  1  0.241  0.648  0.072  1.0
  O  O6  1  0.758  0.844  0.289  1.0
  O  O7  1  0.258  0.156  0.711  1.0
  O  O8  1  0.234  0.088  0.246  1.0
  O  O9  1  0.734  0.912  0.754  1.0
  O  O10  1  0.423  0.805  0.042  1.0
  O  O11  1  0.923  0.195  0.958  1.0
  O  O12  1  0.568  0.186  0.996  1.0
  O  O13  1  0.068  0.814  0.004  1.0
  O  O14  1  0.755  0.517  0.065  1.0
  O  O15  1  0.255  0.483  0.935  1.0
  O  O16  1  0.221  0.524  0.307  1.0
  O  O17  1  0.721  0.476  0.693  1.0
  O  O18  1  0.966  0.394  0.333  1.0
  O  O19  1  0.466  0.606  0.667  1.0
[/CIF]
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The material structure described by KUSiO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(7), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. U(1) is bonded to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted UO7 pentagonal bipyramids that share corners with three equivalent Si(1)O4 tetrahedra, edges with two equivalent U(1)O7 pentagonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. Si(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with three equivalent U(1)O7 pentagonal bipyramids and  an edgeedge with one U(1)O7 pentagonal bipyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one U(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent U(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one K(1), two equivalent U(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one U(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1), one Si(1), and one O(7) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one K(1) and one O(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KUSiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.035
_cell_length_b   6.765
_cell_length_c   7.007
_cell_angle_alpha   75.756
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   323.202
_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  0.053  0.779  0.560  1.0
  K  K1  1  0.553  0.221  0.440  1.0
  U  U2  1  0.743  0.865  0.023  1.0
  U  U3  1  0.243  0.135  0.977  1.0
  Si  Si4  1  0.741  0.352  0.928  1.0
  Si  Si5  1  0.241  0.648  0.072  1.0
  O  O6  1  0.758  0.844  0.289  1.0
  O  O7  1  0.258  0.156  0.711  1.0
  O  O8  1  0.234  0.088  0.246  1.0
  O  O9  1  0.734  0.912  0.754  1.0
  O  O10  1  0.423  0.805  0.042  1.0
  O  O11  1  0.923  0.195  0.958  1.0
  O  O12  1  0.568  0.186  0.996  1.0
  O  O13  1  0.068  0.814  0.004  1.0
  O  O14  1  0.755  0.517  0.065  1.0
  O  O15  1  0.255  0.483  0.935  1.0
  O  O16  1  0.221  0.524  0.307  1.0
  O  O17  1  0.721  0.476  0.693  1.0
  O  O18  1  0.966  0.394  0.333  1.0
  O  O19  1  0.466  0.606  0.667  1.0
[/CIF]
.