The crystal structure described by K3U3Si2O13 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the hexagonal P-62c space group. K(1) is bonded in a 11-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and six equivalent O(2) atoms. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with four equivalent U(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-36°. Si(1) is bonded to one O(4) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 25°. There are four inequivalent O sites. In the first O site, O(4) is bonded in a linear geometry to three equivalent K(1) and two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a linear geometry to two equivalent K(1) and two equivalent U(1) atoms. In the third O site, O(2) is bonded in a 2-coordinate geometry to three equivalent K(1), one U(1), and one Si(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_K3U3Si2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.666
_cell_length_b   9.666
_cell_length_c   8.464
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   684.836
_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  0.959  0.574  0.750  1.0
  K  K1  1  0.041  0.615  0.250  1.0
  K  K2  1  0.426  0.385  0.750  1.0
  K  K3  1  0.385  0.426  0.250  1.0
  K  K4  1  0.615  0.041  0.750  1.0
  K  K5  1  0.574  0.959  0.250  1.0
  U  U6  1  0.756  0.756  0.000  1.0
  U  U7  1  0.000  0.244  0.000  1.0
  U  U8  1  0.244  0.000  0.500  1.0
  U  U9  1  0.244  0.000  0.000  1.0
  U  U10  1  0.756  0.756  0.500  1.0
  U  U11  1  0.000  0.244  0.500  1.0
  Si  Si12  1  0.333  0.667  0.555  1.0
  Si  Si13  1  0.667  0.333  0.055  1.0
  Si  Si14  1  0.333  0.667  0.945  1.0
  Si  Si15  1  0.667  0.333  0.445  1.0
  O  O16  1  0.001  0.254  0.250  1.0
  O  O17  1  0.323  0.821  0.008  1.0
  O  O18  1  0.323  0.821  0.492  1.0
  O  O19  1  0.000  0.809  0.000  1.0
  O  O20  1  0.253  0.999  0.250  1.0
  O  O21  1  0.809  0.000  0.500  1.0
  O  O22  1  0.502  0.179  0.508  1.0
  O  O23  1  0.000  0.809  0.500  1.0
  O  O24  1  0.677  0.498  0.992  1.0
  O  O25  1  0.821  0.323  0.992  1.0
  O  O26  1  0.498  0.677  0.008  1.0
  O  O27  1  0.809  0.000  0.000  1.0
  O  O28  1  0.498  0.677  0.492  1.0
  O  O29  1  0.179  0.502  0.008  1.0
  O  O30  1  0.746  0.747  0.250  1.0
  O  O31  1  0.191  0.191  0.000  1.0
  O  O32  1  0.821  0.323  0.508  1.0
  O  O33  1  0.254  0.001  0.750  1.0
  O  O34  1  0.999  0.253  0.750  1.0
  O  O35  1  0.677  0.498  0.508  1.0
  O  O36  1  0.502  0.179  0.992  1.0
  O  O37  1  0.747  0.746  0.750  1.0
  O  O38  1  0.191  0.191  0.500  1.0
  O  O39  1  0.179  0.502  0.492  1.0
  O  O40  1  0.667  0.333  0.250  1.0
  O  O41  1  0.333  0.667  0.750  1.0
[/CIF]
.
The crystal structure described by K3U3Si2O13 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the hexagonal P-62c space group. K(1) is bonded in a 11-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and six equivalent O(2) atoms. U(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form UO6 octahedra that share corners with four equivalent U(1)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-36°. Si(1) is bonded to one O(4) and three equivalent O(2) atoms to form SiO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 25°. There are four inequivalent O sites. In the first O site, O(4) is bonded in a linear geometry to three equivalent K(1) and two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a linear geometry to two equivalent K(1) and two equivalent U(1) atoms. In the third O site, O(2) is bonded in a 2-coordinate geometry to three equivalent K(1), one U(1), and one Si(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_K3U3Si2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.666
_cell_length_b   9.666
_cell_length_c   8.464
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   684.836
_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  0.959  0.574  0.750  1.0
  K  K1  1  0.041  0.615  0.250  1.0
  K  K2  1  0.426  0.385  0.750  1.0
  K  K3  1  0.385  0.426  0.250  1.0
  K  K4  1  0.615  0.041  0.750  1.0
  K  K5  1  0.574  0.959  0.250  1.0
  U  U6  1  0.756  0.756  0.000  1.0
  U  U7  1  0.000  0.244  0.000  1.0
  U  U8  1  0.244  0.000  0.500  1.0
  U  U9  1  0.244  0.000  0.000  1.0
  U  U10  1  0.756  0.756  0.500  1.0
  U  U11  1  0.000  0.244  0.500  1.0
  Si  Si12  1  0.333  0.667  0.555  1.0
  Si  Si13  1  0.667  0.333  0.055  1.0
  Si  Si14  1  0.333  0.667  0.945  1.0
  Si  Si15  1  0.667  0.333  0.445  1.0
  O  O16  1  0.001  0.254  0.250  1.0
  O  O17  1  0.323  0.821  0.008  1.0
  O  O18  1  0.323  0.821  0.492  1.0
  O  O19  1  0.000  0.809  0.000  1.0
  O  O20  1  0.253  0.999  0.250  1.0
  O  O21  1  0.809  0.000  0.500  1.0
  O  O22  1  0.502  0.179  0.508  1.0
  O  O23  1  0.000  0.809  0.500  1.0
  O  O24  1  0.677  0.498  0.992  1.0
  O  O25  1  0.821  0.323  0.992  1.0
  O  O26  1  0.498  0.677  0.008  1.0
  O  O27  1  0.809  0.000  0.000  1.0
  O  O28  1  0.498  0.677  0.492  1.0
  O  O29  1  0.179  0.502  0.008  1.0
  O  O30  1  0.746  0.747  0.250  1.0
  O  O31  1  0.191  0.191  0.000  1.0
  O  O32  1  0.821  0.323  0.508  1.0
  O  O33  1  0.254  0.001  0.750  1.0
  O  O34  1  0.999  0.253  0.750  1.0
  O  O35  1  0.677  0.498  0.508  1.0
  O  O36  1  0.502  0.179  0.992  1.0
  O  O37  1  0.747  0.746  0.750  1.0
  O  O38  1  0.191  0.191  0.500  1.0
  O  O39  1  0.179  0.502  0.492  1.0
  O  O40  1  0.667  0.333  0.250  1.0
  O  O41  1  0.333  0.667  0.750  1.0
[/CIF]
.