The structure described by U12O19 crystallizes in the trigonal P3m1 space group. There are twelve inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(17), three equivalent O(1), and three equivalent O(19) atoms. In the second U site, U(2) is bonded to one O(1), one O(4), and three equivalent O(2) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(2), one O(6), three equivalent O(3), and three equivalent O(4) atoms. In the fourth U site, U(4) is bonded to one O(3), one O(8), and three equivalent O(6) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the fifth U site, U(5) is bonded in a 7-coordinate geometry to one O(10), three equivalent O(5), and three equivalent O(8) atoms. In the sixth U site, U(6) is bonded to one O(12), one O(7), and three equivalent O(9) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the seventh U site, U(7) is bonded in a 7-coordinate geometry to one O(5), three equivalent O(10), and three equivalent O(7) atoms. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to one O(13), one O(9), three equivalent O(11), and three equivalent O(12) atoms. In the ninth U site, U(9) is bonded to one O(11), one O(15), and three equivalent O(13) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the tenth U site, U(10) is bonded in a 7-coordinate geometry to one O(16), three equivalent O(14), and three equivalent O(15) atoms. In the eleventh U site, U(11) is bonded in a 7-coordinate geometry to one O(19), three equivalent O(17), and three equivalent O(18) atoms. In the twelfth U site, U(12) is bonded to one O(14), one O(18), and three equivalent O(16) atoms to form distorted corner-sharing UO5 trigonal bipyramids. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to one U(2) and three equivalent U(1) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to one U(3) and three equivalent U(2) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to one U(4) and three equivalent U(3) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to one U(2) and three equivalent U(3) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to one U(7) and three equivalent U(5) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to one U(3) and three equivalent U(4) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the seventh O site, O(7) is bonded to one U(6) and three equivalent U(7) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eighth O site, O(8) is bonded to one U(4) and three equivalent U(5) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the ninth O site, O(9) is bonded to one U(8) and three equivalent U(6) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the tenth O site, O(10) is bonded to one U(5) and three equivalent U(7) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eleventh O site, O(11) is bonded to one U(9) and three equivalent U(8) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the twelfth O site, O(12) is bonded to one U(6) and three equivalent U(8) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(8) and three equivalent U(9) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(12) and three equivalent U(10) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(9) and three equivalent U(10) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(10) and three equivalent U(12) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(1) and three equivalent U(11) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(12) and three equivalent U(11) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(11) and three equivalent U(1) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. is represented by the CIF file [CIF]
data_U12O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.850
_cell_length_b   3.850
_cell_length_c   37.028
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   475.337
_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
  U  U0  1  0.667  0.333  0.000  1.0
  U  U1  1  0.333  0.667  0.916  1.0
  U  U2  1  0.000  0.000  0.834  1.0
  U  U3  1  0.667  0.333  0.751  1.0
  U  U4  1  0.333  0.667  0.666  1.0
  U  U5  1  0.667  0.333  0.499  1.0
  U  U6  1  0.000  0.000  0.584  1.0
  U  U7  1  0.333  0.667  0.417  1.0
  U  U8  1  0.000  0.000  0.334  1.0
  U  U9  1  0.667  0.333  0.250  1.0
  U  U10  1  0.000  0.000  0.082  1.0
  U  U11  1  0.333  0.667  0.168  1.0
  O  O12  1  0.333  0.667  0.975  1.0
  O  O13  1  0.000  0.000  0.901  1.0
  O  O14  1  0.667  0.333  0.812  1.0
  O  O15  1  0.333  0.667  0.854  1.0
  O  O16  1  0.000  0.000  0.646  1.0
  O  O17  1  0.000  0.000  0.766  1.0
  O  O18  1  0.667  0.333  0.558  1.0
  O  O19  1  0.667  0.333  0.691  1.0
  O  O20  1  0.333  0.667  0.484  1.0
  O  O21  1  0.333  0.667  0.604  1.0
  O  O22  1  0.000  0.000  0.396  1.0
  O  O23  1  0.667  0.333  0.438  1.0
  O  O24  1  0.333  0.667  0.349  1.0
  O  O25  1  0.333  0.667  0.229  1.0
  O  O26  1  0.000  0.000  0.275  1.0
  O  O27  1  0.667  0.333  0.183  1.0
  O  O28  1  0.667  0.333  0.062  1.0
  O  O29  1  0.333  0.667  0.108  1.0
  O  O30  1  0.000  0.000  0.021  1.0
[/CIF]
.
The structure described by U12O19 crystallizes in the trigonal P3m1 space group. There are twelve inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(17), three equivalent O(1), and three equivalent O(19) atoms. In the second U site, U(2) is bonded to one O(1), one O(4), and three equivalent O(2) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(2), one O(6), three equivalent O(3), and three equivalent O(4) atoms. In the fourth U site, U(4) is bonded to one O(3), one O(8), and three equivalent O(6) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the fifth U site, U(5) is bonded in a 7-coordinate geometry to one O(10), three equivalent O(5), and three equivalent O(8) atoms. In the sixth U site, U(6) is bonded to one O(12), one O(7), and three equivalent O(9) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the seventh U site, U(7) is bonded in a 7-coordinate geometry to one O(5), three equivalent O(10), and three equivalent O(7) atoms. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to one O(13), one O(9), three equivalent O(11), and three equivalent O(12) atoms. In the ninth U site, U(9) is bonded to one O(11), one O(15), and three equivalent O(13) atoms to form distorted corner-sharing UO5 trigonal bipyramids. In the tenth U site, U(10) is bonded in a 7-coordinate geometry to one O(16), three equivalent O(14), and three equivalent O(15) atoms. In the eleventh U site, U(11) is bonded in a 7-coordinate geometry to one O(19), three equivalent O(17), and three equivalent O(18) atoms. In the twelfth U site, U(12) is bonded to one O(14), one O(18), and three equivalent O(16) atoms to form distorted corner-sharing UO5 trigonal bipyramids. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to one U(2) and three equivalent U(1) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to one U(3) and three equivalent U(2) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to one U(4) and three equivalent U(3) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to one U(2) and three equivalent U(3) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to one U(7) and three equivalent U(5) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to one U(3) and three equivalent U(4) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the seventh O site, O(7) is bonded to one U(6) and three equivalent U(7) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eighth O site, O(8) is bonded to one U(4) and three equivalent U(5) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the ninth O site, O(9) is bonded to one U(8) and three equivalent U(6) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the tenth O site, O(10) is bonded to one U(5) and three equivalent U(7) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eleventh O site, O(11) is bonded to one U(9) and three equivalent U(8) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the twelfth O site, O(12) is bonded to one U(6) and three equivalent U(8) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(8) and three equivalent U(9) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(12) and three equivalent U(10) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(9) and three equivalent U(10) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(10) and three equivalent U(12) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(1) and three equivalent U(11) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(12) and three equivalent U(11) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(11) and three equivalent U(1) atoms to form a mixture of corner and edge-sharing OU4 tetrahedra. is represented by the CIF file [CIF]
data_U12O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.850
_cell_length_b   3.850
_cell_length_c   37.028
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   475.337
_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
  U  U0  1  0.667  0.333  0.000  1.0
  U  U1  1  0.333  0.667  0.916  1.0
  U  U2  1  0.000  0.000  0.834  1.0
  U  U3  1  0.667  0.333  0.751  1.0
  U  U4  1  0.333  0.667  0.666  1.0
  U  U5  1  0.667  0.333  0.499  1.0
  U  U6  1  0.000  0.000  0.584  1.0
  U  U7  1  0.333  0.667  0.417  1.0
  U  U8  1  0.000  0.000  0.334  1.0
  U  U9  1  0.667  0.333  0.250  1.0
  U  U10  1  0.000  0.000  0.082  1.0
  U  U11  1  0.333  0.667  0.168  1.0
  O  O12  1  0.333  0.667  0.975  1.0
  O  O13  1  0.000  0.000  0.901  1.0
  O  O14  1  0.667  0.333  0.812  1.0
  O  O15  1  0.333  0.667  0.854  1.0
  O  O16  1  0.000  0.000  0.646  1.0
  O  O17  1  0.000  0.000  0.766  1.0
  O  O18  1  0.667  0.333  0.558  1.0
  O  O19  1  0.667  0.333  0.691  1.0
  O  O20  1  0.333  0.667  0.484  1.0
  O  O21  1  0.333  0.667  0.604  1.0
  O  O22  1  0.000  0.000  0.396  1.0
  O  O23  1  0.667  0.333  0.438  1.0
  O  O24  1  0.333  0.667  0.349  1.0
  O  O25  1  0.333  0.667  0.229  1.0
  O  O26  1  0.000  0.000  0.275  1.0
  O  O27  1  0.667  0.333  0.183  1.0
  O  O28  1  0.667  0.333  0.062  1.0
  O  O29  1  0.333  0.667  0.108  1.0
  O  O30  1  0.000  0.000  0.021  1.0
[/CIF]
.