The crystal structure described by KNd9(SiO4)6O2 crystallizes in the trigonal P3 space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(4), three equivalent O(7), and three equivalent O(9) atoms. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Nd site, Nd(2) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the third Nd site, Nd(3) is bonded in a 6-coordinate geometry to three equivalent O(4) and three equivalent O(9) atoms. In the fourth Nd site, Nd(4) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(6) atoms. In the fifth Nd site, Nd(5) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(8) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(10), one O(4), one O(6), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(5), and one Si(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one K(1), one Nd(1), one Nd(3), and one Si(1) atom. In the third O site, O(10) is bonded in a 4-coordinate geometry to one Nd(2), one Nd(4), one Nd(5), and one Si(2) atom. In the fourth O site, O(1) is bonded in a trigonal planar geometry to three equivalent Nd(1) atoms. In the fifth O site, O(2) is bonded in a trigonal planar geometry to three equivalent Nd(2) atoms. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(4), one Nd(5), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one Nd(2), one Nd(3), and one Si(2) atom. In the eighth O site, O(5) is bonded in a 1-coordinate geometry to one Nd(1), one Nd(2), and one Si(1) atom. In the ninth O site, O(6) is bonded in a 1-coordinate geometry to one Nd(1), one Nd(2), one Nd(4), and one Si(2) atom. In the tenth O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one Nd(1), one Nd(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_KNd9(Si3O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.653
_cell_length_b   9.653
_cell_length_c   7.164
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   578.122
_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  0.000  0.000  0.005  1.0
  Nd  Nd1  1  0.091  0.435  0.255  1.0
  Nd  Nd2  1  0.565  0.656  0.255  1.0
  Nd  Nd3  1  0.344  0.909  0.255  1.0
  Nd  Nd4  1  0.579  0.900  0.758  1.0
  Nd  Nd5  1  0.100  0.679  0.758  1.0
  Nd  Nd6  1  0.321  0.421  0.758  1.0
  Nd  Nd7  1  0.000  0.000  0.506  1.0
  Nd  Nd8  1  0.667  0.333  0.004  1.0
  Nd  Nd9  1  0.667  0.333  0.504  1.0
  Si  Si10  1  0.964  0.695  0.261  1.0
  Si  Si11  1  0.305  0.270  0.261  1.0
  Si  Si12  1  0.730  0.036  0.261  1.0
  Si  Si13  1  0.700  0.634  0.749  1.0
  Si  Si14  1  0.366  0.066  0.749  1.0
  Si  Si15  1  0.934  0.300  0.749  1.0
  O  O16  1  0.333  0.667  0.259  1.0
  O  O17  1  0.333  0.667  0.757  1.0
  O  O18  1  0.846  0.497  0.254  1.0
  O  O19  1  0.503  0.349  0.254  1.0
  O  O20  1  0.651  0.154  0.254  1.0
  O  O21  1  0.803  0.827  0.736  1.0
  O  O22  1  0.173  0.976  0.736  1.0
  O  O23  1  0.024  0.197  0.736  1.0
  O  O24  1  0.086  0.753  0.442  1.0
  O  O25  1  0.247  0.333  0.442  1.0
  O  O26  1  0.667  0.914  0.442  1.0
  O  O27  1  0.587  0.570  0.939  1.0
  O  O28  1  0.430  0.016  0.939  1.0
  O  O29  1  0.984  0.413  0.939  1.0
  O  O30  1  0.086  0.748  0.080  1.0
  O  O31  1  0.252  0.338  0.080  1.0
  O  O32  1  0.662  0.914  0.080  1.0
  O  O33  1  0.578  0.559  0.569  1.0
  O  O34  1  0.441  0.019  0.569  1.0
  O  O35  1  0.981  0.422  0.569  1.0
  O  O36  1  0.857  0.781  0.279  1.0
  O  O37  1  0.219  0.075  0.279  1.0
  O  O38  1  0.925  0.143  0.279  1.0
  O  O39  1  0.804  0.540  0.754  1.0
  O  O40  1  0.460  0.263  0.754  1.0
  O  O41  1  0.737  0.196  0.754  1.0
[/CIF]
.
The crystal structure described by KNd9(SiO4)6O2 crystallizes in the trigonal P3 space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(4), three equivalent O(7), and three equivalent O(9) atoms. There are five inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Nd site, Nd(2) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the third Nd site, Nd(3) is bonded in a 6-coordinate geometry to three equivalent O(4) and three equivalent O(9) atoms. In the fourth Nd site, Nd(4) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(6) atoms. In the fifth Nd site, Nd(5) is bonded in a 9-coordinate geometry to three equivalent O(10), three equivalent O(3), and three equivalent O(8) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(3), one O(5), one O(7), and one O(9) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(10), one O(4), one O(6), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), one Nd(5), and one Si(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one K(1), one Nd(1), one Nd(3), and one Si(1) atom. In the third O site, O(10) is bonded in a 4-coordinate geometry to one Nd(2), one Nd(4), one Nd(5), and one Si(2) atom. In the fourth O site, O(1) is bonded in a trigonal planar geometry to three equivalent Nd(1) atoms. In the fifth O site, O(2) is bonded in a trigonal planar geometry to three equivalent Nd(2) atoms. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(4), one Nd(5), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one Nd(2), one Nd(3), and one Si(2) atom. In the eighth O site, O(5) is bonded in a 1-coordinate geometry to one Nd(1), one Nd(2), and one Si(1) atom. In the ninth O site, O(6) is bonded in a 1-coordinate geometry to one Nd(1), one Nd(2), one Nd(4), and one Si(2) atom. In the tenth O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one Nd(1), one Nd(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_KNd9(Si3O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.653
_cell_length_b   9.653
_cell_length_c   7.164
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   578.122
_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  0.000  0.000  0.005  1.0
  Nd  Nd1  1  0.091  0.435  0.255  1.0
  Nd  Nd2  1  0.565  0.656  0.255  1.0
  Nd  Nd3  1  0.344  0.909  0.255  1.0
  Nd  Nd4  1  0.579  0.900  0.758  1.0
  Nd  Nd5  1  0.100  0.679  0.758  1.0
  Nd  Nd6  1  0.321  0.421  0.758  1.0
  Nd  Nd7  1  0.000  0.000  0.506  1.0
  Nd  Nd8  1  0.667  0.333  0.004  1.0
  Nd  Nd9  1  0.667  0.333  0.504  1.0
  Si  Si10  1  0.964  0.695  0.261  1.0
  Si  Si11  1  0.305  0.270  0.261  1.0
  Si  Si12  1  0.730  0.036  0.261  1.0
  Si  Si13  1  0.700  0.634  0.749  1.0
  Si  Si14  1  0.366  0.066  0.749  1.0
  Si  Si15  1  0.934  0.300  0.749  1.0
  O  O16  1  0.333  0.667  0.259  1.0
  O  O17  1  0.333  0.667  0.757  1.0
  O  O18  1  0.846  0.497  0.254  1.0
  O  O19  1  0.503  0.349  0.254  1.0
  O  O20  1  0.651  0.154  0.254  1.0
  O  O21  1  0.803  0.827  0.736  1.0
  O  O22  1  0.173  0.976  0.736  1.0
  O  O23  1  0.024  0.197  0.736  1.0
  O  O24  1  0.086  0.753  0.442  1.0
  O  O25  1  0.247  0.333  0.442  1.0
  O  O26  1  0.667  0.914  0.442  1.0
  O  O27  1  0.587  0.570  0.939  1.0
  O  O28  1  0.430  0.016  0.939  1.0
  O  O29  1  0.984  0.413  0.939  1.0
  O  O30  1  0.086  0.748  0.080  1.0
  O  O31  1  0.252  0.338  0.080  1.0
  O  O32  1  0.662  0.914  0.080  1.0
  O  O33  1  0.578  0.559  0.569  1.0
  O  O34  1  0.441  0.019  0.569  1.0
  O  O35  1  0.981  0.422  0.569  1.0
  O  O36  1  0.857  0.781  0.279  1.0
  O  O37  1  0.219  0.075  0.279  1.0
  O  O38  1  0.925  0.143  0.279  1.0
  O  O39  1  0.804  0.540  0.754  1.0
  O  O40  1  0.460  0.263  0.754  1.0
  O  O41  1  0.737  0.196  0.754  1.0
[/CIF]
.