The material described by Cs6MgNp2(H8O9)2 crystallizes in the monoclinic C2 space group. There are four inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 7-coordinate geometry to one H(4), one H(8), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to one H(1), one H(3), one H(6), one H(7), one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the third Cs site, Cs(3) is bonded in a 10-coordinate geometry to two equivalent H(3), two equivalent H(6), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. In the fourth Cs site, Cs(4) is bonded in a 8-coordinate geometry to two equivalent H(4), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms. Mg(1) is bonded to two equivalent O(6) and two equivalent O(8) atoms to form MgO4 tetrahedra that share corners with two equivalent Np(1)O6 octahedra. The corner-sharing octahedral tilt angles are 71°. Np(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NpO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Cs(2) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Cs(2), one Cs(3), and one O(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one Cs(1), one Cs(4), and one O(1) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one Cs(2), one Cs(3), and one O(8) atom. In the seventh H site, H(7) is bonded in a distorted single-bond geometry to one Cs(2) and one O(9) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one Cs(1) and one O(10) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(2), one Cs(4), one Np(1), and one H(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(3), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(3), and one Np(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(4), and one Np(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cs(2), one Np(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Mg(1), one Np(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one H(3), and one H(5) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(2), one Mg(1), and one H(6) atom. In the ninth O site, O(9) is bonded in a water-like geometry to two equivalent Cs(2) and two equivalent H(7) atoms. In the tenth O site, O(10) is bonded in a water-like geometry to two equivalent H(8) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs6MgNp2(H8O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.097
_cell_length_b   8.914
_cell_length_c   8.914
_cell_angle_alpha   85.821
_cell_angle_beta   87.177
_cell_angle_gamma   87.177
_symmetry_Int_Tables_number   1
_cell_volume   640.217
_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
  Cs  Cs0  1  0.504  0.602  0.804  1.0
  Cs  Cs1  1  0.996  0.196  0.398  1.0
  Cs  Cs2  1  0.462  0.377  0.203  1.0
  Cs  Cs3  1  0.038  0.797  0.623  1.0
  Cs  Cs4  1  0.250  0.968  0.032  1.0
  Cs  Cs5  1  0.750  0.073  0.927  1.0
  Mg  Mg6  1  0.750  0.730  0.270  1.0
  Np  Np7  1  0.997  0.489  0.005  1.0
  Np  Np8  1  0.503  0.995  0.511  1.0
  H  H9  1  0.934  0.437  0.700  1.0
  H  H10  1  0.566  0.300  0.563  1.0
  H  H11  1  0.020  0.565  0.315  1.0
  H  H12  1  0.480  0.685  0.435  1.0
  H  H13  1  0.204  0.083  0.714  1.0
  H  H14  1  0.296  0.286  0.917  1.0
  H  H15  1  0.746  0.021  0.288  1.0
  H  H16  1  0.754  0.712  0.979  1.0
  H  H17  1  0.090  0.235  0.745  1.0
  H  H18  1  0.410  0.255  0.765  1.0
  H  H19  1  0.018  0.848  0.250  1.0
  H  H20  1  0.482  0.750  0.152  1.0
  H  H21  1  0.170  0.474  0.600  1.0
  H  H22  1  0.330  0.400  0.526  1.0
  H  H23  1  0.819  0.477  0.439  1.0
  H  H24  1  0.681  0.561  0.523  1.0
  O  O25  1  0.870  0.710  0.940  1.0
  O  O26  1  0.630  0.060  0.290  1.0
  O  O27  1  0.124  0.299  0.066  1.0
  O  O28  1  0.376  0.934  0.701  1.0
  O  O29  1  0.192  0.598  0.005  1.0
  O  O30  1  0.308  0.995  0.402  1.0
  O  O31  1  0.793  0.397  0.006  1.0
  O  O32  1  0.707  0.994  0.603  1.0
  O  O33  1  0.041  0.435  0.747  1.0
  O  O34  1  0.459  0.253  0.565  1.0
  O  O35  1  0.915  0.546  0.272  1.0
  O  O36  1  0.585  0.728  0.454  1.0
  O  O37  1  0.090  0.123  0.738  1.0
  O  O38  1  0.410  0.262  0.877  1.0
  O  O39  1  0.911  0.884  0.289  1.0
  O  O40  1  0.589  0.711  0.116  1.0
  O  O41  1  0.250  0.490  0.510  1.0
  O  O42  1  0.750  0.465  0.535  1.0
[/CIF]
.
The material described by Cs6MgNp2(H8O9)2 crystallizes in the monoclinic C2 space group. There are four inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 7-coordinate geometry to one H(4), one H(8), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to one H(1), one H(3), one H(6), one H(7), one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. In the third Cs site, Cs(3) is bonded in a 10-coordinate geometry to two equivalent H(3), two equivalent H(6), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. In the fourth Cs site, Cs(4) is bonded in a 8-coordinate geometry to two equivalent H(4), two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms. Mg(1) is bonded to two equivalent O(6) and two equivalent O(8) atoms to form MgO4 tetrahedra that share corners with two equivalent Np(1)O6 octahedra. The corner-sharing octahedral tilt angles are 71°. Np(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NpO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Cs(2) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a single-bond geometry to one Cs(2), one Cs(3), and one O(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one Cs(1), one Cs(4), and one O(1) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one Cs(2), one Cs(3), and one O(8) atom. In the seventh H site, H(7) is bonded in a distorted single-bond geometry to one Cs(2) and one O(9) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one Cs(1) and one O(10) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(2), one Cs(4), one Np(1), and one H(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(3), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(3), and one Np(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), one Cs(4), and one Np(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cs(2), one Np(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Mg(1), one Np(1), and one H(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one H(3), and one H(5) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(2), one Mg(1), and one H(6) atom. In the ninth O site, O(9) is bonded in a water-like geometry to two equivalent Cs(2) and two equivalent H(7) atoms. In the tenth O site, O(10) is bonded in a water-like geometry to two equivalent H(8) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs6MgNp2(H8O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.097
_cell_length_b   8.914
_cell_length_c   8.914
_cell_angle_alpha   85.821
_cell_angle_beta   87.177
_cell_angle_gamma   87.177
_symmetry_Int_Tables_number   1
_cell_volume   640.217
_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
  Cs  Cs0  1  0.504  0.602  0.804  1.0
  Cs  Cs1  1  0.996  0.196  0.398  1.0
  Cs  Cs2  1  0.462  0.377  0.203  1.0
  Cs  Cs3  1  0.038  0.797  0.623  1.0
  Cs  Cs4  1  0.250  0.968  0.032  1.0
  Cs  Cs5  1  0.750  0.073  0.927  1.0
  Mg  Mg6  1  0.750  0.730  0.270  1.0
  Np  Np7  1  0.997  0.489  0.005  1.0
  Np  Np8  1  0.503  0.995  0.511  1.0
  H  H9  1  0.934  0.437  0.700  1.0
  H  H10  1  0.566  0.300  0.563  1.0
  H  H11  1  0.020  0.565  0.315  1.0
  H  H12  1  0.480  0.685  0.435  1.0
  H  H13  1  0.204  0.083  0.714  1.0
  H  H14  1  0.296  0.286  0.917  1.0
  H  H15  1  0.746  0.021  0.288  1.0
  H  H16  1  0.754  0.712  0.979  1.0
  H  H17  1  0.090  0.235  0.745  1.0
  H  H18  1  0.410  0.255  0.765  1.0
  H  H19  1  0.018  0.848  0.250  1.0
  H  H20  1  0.482  0.750  0.152  1.0
  H  H21  1  0.170  0.474  0.600  1.0
  H  H22  1  0.330  0.400  0.526  1.0
  H  H23  1  0.819  0.477  0.439  1.0
  H  H24  1  0.681  0.561  0.523  1.0
  O  O25  1  0.870  0.710  0.940  1.0
  O  O26  1  0.630  0.060  0.290  1.0
  O  O27  1  0.124  0.299  0.066  1.0
  O  O28  1  0.376  0.934  0.701  1.0
  O  O29  1  0.192  0.598  0.005  1.0
  O  O30  1  0.308  0.995  0.402  1.0
  O  O31  1  0.793  0.397  0.006  1.0
  O  O32  1  0.707  0.994  0.603  1.0
  O  O33  1  0.041  0.435  0.747  1.0
  O  O34  1  0.459  0.253  0.565  1.0
  O  O35  1  0.915  0.546  0.272  1.0
  O  O36  1  0.585  0.728  0.454  1.0
  O  O37  1  0.090  0.123  0.738  1.0
  O  O38  1  0.410  0.262  0.877  1.0
  O  O39  1  0.911  0.884  0.289  1.0
  O  O40  1  0.589  0.711  0.116  1.0
  O  O41  1  0.250  0.490  0.510  1.0
  O  O42  1  0.750  0.465  0.535  1.0
[/CIF]
.