The material structure described by Rb4U3(AsO8)2 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(10), one O(4), one O(5), one O(6), one O(9), and two equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(5), one O(6), one O(8), two equivalent O(10), and two equivalent O(9) atoms. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(10) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the second U site, U(2) is bonded to one O(10), one O(2), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form distorted UO7 pentagonal bipyramids that share corners with three equivalent As(1)O4 tetrahedra and  an edgeedge with one U(2)O7 pentagonal bipyramid. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent U(2)O7 pentagonal bipyramids. There are ten inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one U(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one U(1) atom. In the third O site, O(7) is bonded in a trigonal planar geometry to one U(1) and two equivalent U(2) atoms. In the fourth O site, O(8) is bonded in a distorted trigonal planar geometry to one Rb(2), one U(1), and two equivalent U(2) atoms. In the fifth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one U(2) atom. In the sixth O site, O(10) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one U(2) atom. In the seventh O site, O(1) is bonded in a 4-coordinate geometry to one Rb(3), two equivalent Rb(1), and one As(1) atom. In the eighth O site, O(2) is bonded in a 2-coordinate geometry to one U(2) and one As(1) atom. In the ninth O site, O(3) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one As(1) atom. In the tenth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(1), one U(1), one U(2), and one As(1) atom. is represented by the CIF card [CIF]
data_Rb4U3(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.652
_cell_length_b   7.168
_cell_length_c   7.222
_cell_angle_alpha   89.081
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   913.561
_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
  Rb  Rb0  1  0.885  0.537  0.106  1.0
  Rb  Rb1  1  0.385  0.463  0.894  1.0
  Rb  Rb2  1  0.115  0.463  0.894  1.0
  Rb  Rb3  1  0.615  0.537  0.106  1.0
  Rb  Rb4  1  0.250  0.958  0.947  1.0
  Rb  Rb5  1  0.750  0.042  0.053  1.0
  Rb  Rb6  1  0.000  0.000  0.000  1.0
  Rb  Rb7  1  0.500  0.000  0.000  1.0
  U  U8  1  0.250  0.282  0.421  1.0
  U  U9  1  0.750  0.718  0.579  1.0
  U  U10  1  0.144  0.781  0.423  1.0
  U  U11  1  0.644  0.219  0.577  1.0
  U  U12  1  0.856  0.219  0.577  1.0
  U  U13  1  0.356  0.781  0.423  1.0
  As  As14  1  0.054  0.284  0.400  1.0
  As  As15  1  0.554  0.716  0.600  1.0
  As  As16  1  0.946  0.716  0.600  1.0
  As  As17  1  0.446  0.284  0.400  1.0
  O  O18  1  0.017  0.333  0.190  1.0
  O  O19  1  0.517  0.667  0.810  1.0
  O  O20  1  0.983  0.667  0.810  1.0
  O  O21  1  0.483  0.333  0.190  1.0
  O  O22  1  0.990  0.241  0.576  1.0
  O  O23  1  0.490  0.759  0.424  1.0
  O  O24  1  0.010  0.759  0.424  1.0
  O  O25  1  0.510  0.241  0.576  1.0
  O  O26  1  0.118  0.102  0.380  1.0
  O  O27  1  0.618  0.898  0.620  1.0
  O  O28  1  0.882  0.898  0.620  1.0
  O  O29  1  0.382  0.102  0.380  1.0
  O  O30  1  0.121  0.446  0.471  1.0
  O  O31  1  0.621  0.554  0.529  1.0
  O  O32  1  0.879  0.554  0.529  1.0
  O  O33  1  0.379  0.446  0.471  1.0
  O  O34  1  0.250  0.260  0.677  1.0
  O  O35  1  0.750  0.740  0.323  1.0
  O  O36  1  0.250  0.306  0.166  1.0
  O  O37  1  0.750  0.694  0.834  1.0
  O  O38  1  0.250  0.599  0.431  1.0
  O  O39  1  0.750  0.401  0.569  1.0
  O  O40  1  0.250  0.963  0.399  1.0
  O  O41  1  0.750  0.037  0.601  1.0
  O  O42  1  0.145  0.805  0.678  1.0
  O  O43  1  0.645  0.195  0.322  1.0
  O  O44  1  0.855  0.195  0.322  1.0
  O  O45  1  0.355  0.805  0.678  1.0
  O  O46  1  0.137  0.760  0.167  1.0
  O  O47  1  0.637  0.240  0.833  1.0
  O  O48  1  0.863  0.240  0.833  1.0
  O  O49  1  0.363  0.760  0.167  1.0
[/CIF]
.
The material structure described by Rb4U3(AsO8)2 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(10), one O(4), one O(5), one O(6), one O(9), and two equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(5), one O(6), one O(8), two equivalent O(10), and two equivalent O(9) atoms. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(10) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(3), and two equivalent O(4) atoms. In the second U site, U(2) is bonded to one O(10), one O(2), one O(3), one O(4), one O(7), one O(8), and one O(9) atom to form distorted UO7 pentagonal bipyramids that share corners with three equivalent As(1)O4 tetrahedra and  an edgeedge with one U(2)O7 pentagonal bipyramid. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent U(2)O7 pentagonal bipyramids. There are ten inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one U(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one U(1) atom. In the third O site, O(7) is bonded in a trigonal planar geometry to one U(1) and two equivalent U(2) atoms. In the fourth O site, O(8) is bonded in a distorted trigonal planar geometry to one Rb(2), one U(1), and two equivalent U(2) atoms. In the fifth O site, O(9) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one U(2) atom. In the sixth O site, O(10) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), one Rb(3), and one U(2) atom. In the seventh O site, O(1) is bonded in a 4-coordinate geometry to one Rb(3), two equivalent Rb(1), and one As(1) atom. In the eighth O site, O(2) is bonded in a 2-coordinate geometry to one U(2) and one As(1) atom. In the ninth O site, O(3) is bonded in a 3-coordinate geometry to one U(1), one U(2), and one As(1) atom. In the tenth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(1), one U(1), one U(2), and one As(1) atom. is represented by the CIF card [CIF]
data_Rb4U3(AsO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.652
_cell_length_b   7.168
_cell_length_c   7.222
_cell_angle_alpha   89.081
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   913.561
_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
  Rb  Rb0  1  0.885  0.537  0.106  1.0
  Rb  Rb1  1  0.385  0.463  0.894  1.0
  Rb  Rb2  1  0.115  0.463  0.894  1.0
  Rb  Rb3  1  0.615  0.537  0.106  1.0
  Rb  Rb4  1  0.250  0.958  0.947  1.0
  Rb  Rb5  1  0.750  0.042  0.053  1.0
  Rb  Rb6  1  0.000  0.000  0.000  1.0
  Rb  Rb7  1  0.500  0.000  0.000  1.0
  U  U8  1  0.250  0.282  0.421  1.0
  U  U9  1  0.750  0.718  0.579  1.0
  U  U10  1  0.144  0.781  0.423  1.0
  U  U11  1  0.644  0.219  0.577  1.0
  U  U12  1  0.856  0.219  0.577  1.0
  U  U13  1  0.356  0.781  0.423  1.0
  As  As14  1  0.054  0.284  0.400  1.0
  As  As15  1  0.554  0.716  0.600  1.0
  As  As16  1  0.946  0.716  0.600  1.0
  As  As17  1  0.446  0.284  0.400  1.0
  O  O18  1  0.017  0.333  0.190  1.0
  O  O19  1  0.517  0.667  0.810  1.0
  O  O20  1  0.983  0.667  0.810  1.0
  O  O21  1  0.483  0.333  0.190  1.0
  O  O22  1  0.990  0.241  0.576  1.0
  O  O23  1  0.490  0.759  0.424  1.0
  O  O24  1  0.010  0.759  0.424  1.0
  O  O25  1  0.510  0.241  0.576  1.0
  O  O26  1  0.118  0.102  0.380  1.0
  O  O27  1  0.618  0.898  0.620  1.0
  O  O28  1  0.882  0.898  0.620  1.0
  O  O29  1  0.382  0.102  0.380  1.0
  O  O30  1  0.121  0.446  0.471  1.0
  O  O31  1  0.621  0.554  0.529  1.0
  O  O32  1  0.879  0.554  0.529  1.0
  O  O33  1  0.379  0.446  0.471  1.0
  O  O34  1  0.250  0.260  0.677  1.0
  O  O35  1  0.750  0.740  0.323  1.0
  O  O36  1  0.250  0.306  0.166  1.0
  O  O37  1  0.750  0.694  0.834  1.0
  O  O38  1  0.250  0.599  0.431  1.0
  O  O39  1  0.750  0.401  0.569  1.0
  O  O40  1  0.250  0.963  0.399  1.0
  O  O41  1  0.750  0.037  0.601  1.0
  O  O42  1  0.145  0.805  0.678  1.0
  O  O43  1  0.645  0.195  0.322  1.0
  O  O44  1  0.855  0.195  0.322  1.0
  O  O45  1  0.355  0.805  0.678  1.0
  O  O46  1  0.137  0.760  0.167  1.0
  O  O47  1  0.637  0.240  0.833  1.0
  O  O48  1  0.863  0.240  0.833  1.0
  O  O49  1  0.363  0.760  0.167  1.0
[/CIF]
.