The compound described by K3Np3Si2O13 crystallizes in the triclinic P1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(11), one O(8), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(9), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(12), one O(7), two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms. There are three inequivalent Np sites. In the first Np site, Np(1) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(4), two equivalent O(11), and two equivalent O(7) atoms. In the second Np site, Np(2) is bonded in a 7-coordinate geometry to one O(13), one O(2), one O(5), two equivalent O(10), and two equivalent O(8) atoms. In the third Np site, Np(3) is bonded in a 7-coordinate geometry to one O(13), one O(3), one O(6), two equivalent O(12), and two equivalent O(9) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal planar geometry to one O(7), one O(8), and one O(9) atom. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(12), and two equivalent O(13) atoms to form distorted corner-sharing SiO5 trigonal bipyramids. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(3), and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one Np(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent K(3), and one Np(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent K(2) and one Np(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(3) and one Np(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Np(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(3), two equivalent Np(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), two equivalent Np(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(2), two equivalent Np(3), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(2), two equivalent Np(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one K(1), two equivalent Np(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one K(3), two equivalent Np(3), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Np(1), one Np(2), one Np(3), and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_K3Np3Si2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.958
_cell_length_b   9.838
_cell_length_c   9.801
_cell_angle_alpha   120.046
_cell_angle_beta   89.986
_cell_angle_gamma   90.030
_symmetry_Int_Tables_number   1
_cell_volume   330.324
_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
  K  K0  1  0.499  0.219  0.996  1.0
  K  K1  1  0.499  0.777  0.780  1.0
  K  K2  1  0.499  0.003  0.223  1.0
  Np  Np3  1  0.000  0.424  0.402  1.0
  Np  Np4  1  0.000  0.979  0.577  1.0
  Np  Np5  1  0.000  0.597  0.020  1.0
  Si  Si6  1  0.495  0.333  0.667  1.0
  Si  Si7  1  0.559  0.667  0.333  1.0
  O  O8  1  0.001  0.231  0.211  1.0
  O  O9  1  0.001  0.980  0.769  1.0
  O  O10  1  0.001  0.788  0.019  1.0
  O  O11  1  0.998  0.598  0.603  1.0
  O  O12  1  0.998  0.005  0.403  1.0
  O  O13  1  0.998  0.397  0.995  1.0
  O  O14  1  0.496  0.326  0.500  1.0
  O  O15  1  0.496  0.174  0.674  1.0
  O  O16  1  0.496  0.500  0.827  1.0
  O  O17  1  0.494  0.833  0.503  1.0
  O  O18  1  0.494  0.498  0.330  1.0
  O  O19  1  0.494  0.670  0.167  1.0
  O  O20  1  0.983  0.667  0.333  1.0
[/CIF]
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The compound described by K3Np3Si2O13 crystallizes in the triclinic P1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(11), one O(8), two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(9), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(12), one O(7), two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms. There are three inequivalent Np sites. In the first Np site, Np(1) is bonded in a 7-coordinate geometry to one O(1), one O(13), one O(4), two equivalent O(11), and two equivalent O(7) atoms. In the second Np site, Np(2) is bonded in a 7-coordinate geometry to one O(13), one O(2), one O(5), two equivalent O(10), and two equivalent O(8) atoms. In the third Np site, Np(3) is bonded in a 7-coordinate geometry to one O(13), one O(3), one O(6), two equivalent O(12), and two equivalent O(9) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal planar geometry to one O(7), one O(8), and one O(9) atom. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(12), and two equivalent O(13) atoms to form distorted corner-sharing SiO5 trigonal bipyramids. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(3), and one Np(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one Np(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent K(3), and one Np(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent K(2) and one Np(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(3) and one Np(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Np(3) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(3), two equivalent Np(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), two equivalent Np(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(2), two equivalent Np(3), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(2), two equivalent Np(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one K(1), two equivalent Np(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one K(3), two equivalent Np(3), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Np(1), one Np(2), one Np(3), and two equivalent Si(2) atoms. is represented by the CIF file [CIF]
data_K3Np3Si2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.958
_cell_length_b   9.838
_cell_length_c   9.801
_cell_angle_alpha   120.046
_cell_angle_beta   89.986
_cell_angle_gamma   90.030
_symmetry_Int_Tables_number   1
_cell_volume   330.324
_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
  K  K0  1  0.499  0.219  0.996  1.0
  K  K1  1  0.499  0.777  0.780  1.0
  K  K2  1  0.499  0.003  0.223  1.0
  Np  Np3  1  0.000  0.424  0.402  1.0
  Np  Np4  1  0.000  0.979  0.577  1.0
  Np  Np5  1  0.000  0.597  0.020  1.0
  Si  Si6  1  0.495  0.333  0.667  1.0
  Si  Si7  1  0.559  0.667  0.333  1.0
  O  O8  1  0.001  0.231  0.211  1.0
  O  O9  1  0.001  0.980  0.769  1.0
  O  O10  1  0.001  0.788  0.019  1.0
  O  O11  1  0.998  0.598  0.603  1.0
  O  O12  1  0.998  0.005  0.403  1.0
  O  O13  1  0.998  0.397  0.995  1.0
  O  O14  1  0.496  0.326  0.500  1.0
  O  O15  1  0.496  0.174  0.674  1.0
  O  O16  1  0.496  0.500  0.827  1.0
  O  O17  1  0.494  0.833  0.503  1.0
  O  O18  1  0.494  0.498  0.330  1.0
  O  O19  1  0.494  0.670  0.167  1.0
  O  O20  1  0.983  0.667  0.333  1.0
[/CIF]
.