The crystal structure described by Pr9K(SiO4)6O2 crystallizes in the trigonal P3 space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(4), and three equivalent O(7) atoms. There are five inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(8) atoms. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(9) atoms. In the third Pr site, Pr(3) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(10), and three equivalent O(4) atoms. In the fourth Pr site, Pr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. In the fifth Pr site, Pr(5) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(3), and one O(7) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(8), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(4), one Pr(5), and one Si(2) atom. In the second O site, O(9) is bonded in a 1-coordinate geometry to one Pr(2), one Pr(4), one Pr(5), and one Si(2) atom. In the third O site, O(10) is bonded in a 1-coordinate geometry to one Pr(3), one Pr(4), one Pr(5), and one Si(1) atom. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Pr(3), one Pr(4), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Pr(5), and one Si(2) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Pr(4), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one Pr(3), one Pr(5), and one Si(2) atom. In the eighth O site, O(5) is bonded in a trigonal planar geometry to three equivalent Pr(4) atoms. In the ninth O site, O(6) is bonded in a trigonal planar geometry to three equivalent Pr(5) atoms. In the tenth O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one Pr(4), one Pr(5), and one Si(1) atom. is represented by the CIF file [CIF]
data_KPr9(Si3O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.717
_cell_length_b   9.717
_cell_length_c   7.217
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   590.182
_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  0.499  1.0
  Pr  Pr1  1  0.667  0.333  0.999  1.0
  Pr  Pr2  1  0.667  0.333  0.499  1.0
  Pr  Pr3  1  0.000  0.000  0.998  1.0
  Pr  Pr4  1  0.342  0.434  0.748  1.0
  Pr  Pr5  1  0.566  0.908  0.748  1.0
  Pr  Pr6  1  0.092  0.658  0.748  1.0
  Pr  Pr7  1  0.321  0.900  0.252  1.0
  Pr  Pr8  1  0.100  0.421  0.252  1.0
  Pr  Pr9  1  0.579  0.679  0.252  1.0
  Si  Si10  1  0.962  0.268  0.753  1.0
  Si  Si11  1  0.732  0.693  0.753  1.0
  Si  Si12  1  0.307  0.038  0.753  1.0
  Si  Si13  1  0.700  0.065  0.244  1.0
  Si  Si14  1  0.935  0.635  0.244  1.0
  Si  Si15  1  0.365  0.300  0.244  1.0
  O  O16  1  0.856  0.075  0.769  1.0
  O  O17  1  0.925  0.781  0.769  1.0
  O  O18  1  0.219  0.144  0.769  1.0
  O  O19  1  0.802  0.262  0.249  1.0
  O  O20  1  0.738  0.539  0.249  1.0
  O  O21  1  0.461  0.198  0.249  1.0
  O  O22  1  0.652  0.498  0.749  1.0
  O  O23  1  0.502  0.155  0.749  1.0
  O  O24  1  0.845  0.348  0.749  1.0
  O  O25  1  0.021  0.826  0.229  1.0
  O  O26  1  0.174  0.195  0.229  1.0
  O  O27  1  0.805  0.979  0.229  1.0
  O  O28  1  0.333  0.667  0.756  1.0
  O  O29  1  0.333  0.667  0.251  1.0
  O  O30  1  0.083  0.338  0.574  1.0
  O  O31  1  0.662  0.744  0.574  1.0
  O  O32  1  0.256  0.917  0.574  1.0
  O  O33  1  0.578  0.017  0.065  1.0
  O  O34  1  0.983  0.561  0.065  1.0
  O  O35  1  0.439  0.422  0.065  1.0
  O  O36  1  0.587  0.013  0.432  1.0
  O  O37  1  0.987  0.574  0.432  1.0
  O  O38  1  0.426  0.413  0.432  1.0
  O  O39  1  0.082  0.328  0.934  1.0
  O  O40  1  0.672  0.754  0.934  1.0
  O  O41  1  0.246  0.918  0.934  1.0
[/CIF]
.
The crystal structure described by Pr9K(SiO4)6O2 crystallizes in the trigonal P3 space group. K(1) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(4), and three equivalent O(7) atoms. There are five inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(8) atoms. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(9) atoms. In the third Pr site, Pr(3) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(10), and three equivalent O(4) atoms. In the fourth Pr site, Pr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. In the fifth Pr site, Pr(5) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(3), and one O(7) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(8), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a 1-coordinate geometry to one Pr(1), one Pr(4), one Pr(5), and one Si(2) atom. In the second O site, O(9) is bonded in a 1-coordinate geometry to one Pr(2), one Pr(4), one Pr(5), and one Si(2) atom. In the third O site, O(10) is bonded in a 1-coordinate geometry to one Pr(3), one Pr(4), one Pr(5), and one Si(1) atom. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Pr(3), one Pr(4), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Pr(5), and one Si(2) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), one Pr(2), one Pr(4), and one Si(1) atom. In the seventh O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one Pr(3), one Pr(5), and one Si(2) atom. In the eighth O site, O(5) is bonded in a trigonal planar geometry to three equivalent Pr(4) atoms. In the ninth O site, O(6) is bonded in a trigonal planar geometry to three equivalent Pr(5) atoms. In the tenth O site, O(7) is bonded in a 1-coordinate geometry to one K(1), one Pr(4), one Pr(5), and one Si(1) atom. is represented by the CIF file [CIF]
data_KPr9(Si3O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.717
_cell_length_b   9.717
_cell_length_c   7.217
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   590.182
_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  0.499  1.0
  Pr  Pr1  1  0.667  0.333  0.999  1.0
  Pr  Pr2  1  0.667  0.333  0.499  1.0
  Pr  Pr3  1  0.000  0.000  0.998  1.0
  Pr  Pr4  1  0.342  0.434  0.748  1.0
  Pr  Pr5  1  0.566  0.908  0.748  1.0
  Pr  Pr6  1  0.092  0.658  0.748  1.0
  Pr  Pr7  1  0.321  0.900  0.252  1.0
  Pr  Pr8  1  0.100  0.421  0.252  1.0
  Pr  Pr9  1  0.579  0.679  0.252  1.0
  Si  Si10  1  0.962  0.268  0.753  1.0
  Si  Si11  1  0.732  0.693  0.753  1.0
  Si  Si12  1  0.307  0.038  0.753  1.0
  Si  Si13  1  0.700  0.065  0.244  1.0
  Si  Si14  1  0.935  0.635  0.244  1.0
  Si  Si15  1  0.365  0.300  0.244  1.0
  O  O16  1  0.856  0.075  0.769  1.0
  O  O17  1  0.925  0.781  0.769  1.0
  O  O18  1  0.219  0.144  0.769  1.0
  O  O19  1  0.802  0.262  0.249  1.0
  O  O20  1  0.738  0.539  0.249  1.0
  O  O21  1  0.461  0.198  0.249  1.0
  O  O22  1  0.652  0.498  0.749  1.0
  O  O23  1  0.502  0.155  0.749  1.0
  O  O24  1  0.845  0.348  0.749  1.0
  O  O25  1  0.021  0.826  0.229  1.0
  O  O26  1  0.174  0.195  0.229  1.0
  O  O27  1  0.805  0.979  0.229  1.0
  O  O28  1  0.333  0.667  0.756  1.0
  O  O29  1  0.333  0.667  0.251  1.0
  O  O30  1  0.083  0.338  0.574  1.0
  O  O31  1  0.662  0.744  0.574  1.0
  O  O32  1  0.256  0.917  0.574  1.0
  O  O33  1  0.578  0.017  0.065  1.0
  O  O34  1  0.983  0.561  0.065  1.0
  O  O35  1  0.439  0.422  0.065  1.0
  O  O36  1  0.587  0.013  0.432  1.0
  O  O37  1  0.987  0.574  0.432  1.0
  O  O38  1  0.426  0.413  0.432  1.0
  O  O39  1  0.082  0.328  0.934  1.0
  O  O40  1  0.672  0.754  0.934  1.0
  O  O41  1  0.246  0.918  0.934  1.0
[/CIF]
.