The structure described by Na6Ta3Al(SiO4)6 crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to one O(1), one O(11), one O(21), one O(23), one O(3), and one O(9) atom. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(12), one O(2), one O(22), one O(24), and one O(4) atom. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(19), one O(2), one O(20), one O(21), and one O(22) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(17), one O(18), one O(23), one O(24), one O(3), and one O(4) atom. In the fifth Na site, Na(5) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(14), one O(23), one O(4), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 7-coordinate geometry to one O(10), one O(16), one O(2), one O(21), one O(6), one O(7), and one O(9) atom. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(15), one O(20), one O(21), one O(7), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the second Ta site, Ta(2) is bonded to one O(10), one O(16), one O(19), one O(2), one O(22), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the third Ta site, Ta(3) is bonded to one O(11), one O(13), one O(18), one O(23), one O(3), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. Al(1) is bonded to one O(12), one O(14), one O(17), one O(24), one O(4), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(21), one O(22), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-37°. In the second Si site, Si(2) is bonded to one O(23), one O(24), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-37°. In the third Si site, Si(3) is bonded to one O(13), one O(17), one O(2), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-39°. In the fourth Si site, Si(4) is bonded to one O(1), one O(10), one O(14), and one O(18) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-36°. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(19), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-38°. In the sixth Si site, Si(6) is bonded to one O(12), one O(16), one O(20), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-36°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(3), one Ta(1), and one Si(4) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Na(6), one Ta(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(4), one Ta(3), and one Si(6) atom. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(5), one Al(1), and one Si(5) atom to form distorted ONa3AlSi trigonal bipyramids that share corners with two equivalent O(23)Na3TaSi trigonal bipyramids,  a cornercorner with one O(10)Na2TaSi trigonal pyramid, and  an edgeedge with one O(11)Na2TaSi trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(5), one Ta(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(6), one Al(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Na(6), one Ta(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Na(5), one Ta(2), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(6), one Ta(1), and one Si(3) atom. In the tenth O site, O(10) is bonded to one Na(2), one Na(6), one Ta(2), and one Si(4) atom to form distorted corner-sharing ONa2TaSi trigonal pyramids. In the eleventh O site, O(11) is bonded to one Na(1), one Na(5), one Ta(3), and one Si(5) atom to form distorted ONa2TaSi trigonal pyramids that share  an edgeedge with one O(4)Na3AlSi trigonal bipyramid and  a faceface with one O(23)Na3TaSi trigonal bipyramid. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(5), one Al(1), and one Si(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Ta(3), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Al(1), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one Ta(1) and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Na(6), one Ta(2), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(4), one Al(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one Na(4), one Ta(3), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Na(3), one Ta(2), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Ta(1), and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(6), one Ta(1), and one Si(1) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Ta(2), and one Si(1) atom. In the twenty-third O site, O(23) is bonded to one Na(1), one Na(4), one Na(5), one Ta(3), and one Si(2) atom to form distorted ONa3TaSi trigonal bipyramids that share corners with two equivalent O(4)Na3AlSi trigonal bipyramids and  a faceface with one O(11)Na2TaSi trigonal pyramid. In the twenty-fourth O site, O(24) is bonded in a rectangular see-saw-like geometry to one Na(2), one Na(4), one Al(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na6Ta3Al(SiO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.956
_cell_length_b   8.988
_cell_length_c   8.995
_cell_angle_alpha   90.533
_cell_angle_beta   119.761
_cell_angle_gamma   119.381
_symmetry_Int_Tables_number   1
_cell_volume   516.169
_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
  Al  Al0  1  0.789  0.933  0.647  1.0
  Na  Na1  1  0.501  0.001  0.001  1.0
  Na  Na2  1  0.511  0.518  0.509  1.0
  Na  Na3  1  0.990  0.235  0.392  1.0
  Na  Na4  1  0.002  0.768  0.626  1.0
  Na  Na5  1  0.398  0.788  0.264  1.0
  Na  Na6  1  0.621  0.196  0.742  1.0
  O  O7  1  0.704  0.265  0.277  1.0
  O  O8  1  0.302  0.239  0.580  1.0
  O  O9  1  0.295  0.738  0.723  1.0
  O  O10  1  0.695  0.761  0.424  1.0
  O  O11  1  0.142  0.436  0.008  1.0
  O  O12  1  0.856  0.078  0.849  1.0
  O  O13  1  0.858  0.566  0.990  1.0
  O  O14  1  0.130  0.918  0.139  1.0
  O  O15  1  0.488  0.254  0.922  1.0
  O  O16  1  0.517  0.238  0.447  1.0
  O  O17  1  0.513  0.746  0.077  1.0
  O  O18  1  0.491  0.767  0.554  1.0
  O  O19  1  0.280  0.414  0.792  1.0
  O  O20  1  0.714  0.070  0.493  1.0
  O  O21  1  0.721  0.587  0.209  1.0
  O  O22  1  0.287  0.926  0.503  1.0
  O  O23  1  0.065  0.054  0.703  1.0
  O  O24  1  0.926  0.432  0.636  1.0
  O  O25  1  0.928  0.941  0.295  1.0
  O  O26  1  0.075  0.569  0.365  1.0
  O  O27  1  0.839  0.260  0.062  1.0
  O  O28  1  0.162  0.239  0.227  1.0
  O  O29  1  0.164  0.743  0.940  1.0
  O  O30  1  0.834  0.764  0.765  1.0
  Si  Si31  1  0.001  0.245  0.031  1.0
  Si  Si32  1  0.986  0.749  0.949  1.0
  Si  Si33  1  0.278  0.233  0.752  1.0
  Si  Si34  1  0.713  0.247  0.462  1.0
  Si  Si35  1  0.713  0.760  0.254  1.0
  Si  Si36  1  0.297  0.749  0.541  1.0
  Ta  Ta37  1  0.786  0.435  0.141  1.0
  Ta  Ta38  1  0.213  0.071  0.353  1.0
  Ta  Ta39  1  0.216  0.567  0.858  1.0
[/CIF]
.
The structure described by Na6Ta3Al(SiO4)6 crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to one O(1), one O(11), one O(21), one O(23), one O(3), and one O(9) atom. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(12), one O(2), one O(22), one O(24), and one O(4) atom. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(19), one O(2), one O(20), one O(21), and one O(22) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(17), one O(18), one O(23), one O(24), one O(3), and one O(4) atom. In the fifth Na site, Na(5) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(14), one O(23), one O(4), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 7-coordinate geometry to one O(10), one O(16), one O(2), one O(21), one O(6), one O(7), and one O(9) atom. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(15), one O(20), one O(21), one O(7), and one O(9) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the second Ta site, Ta(2) is bonded to one O(10), one O(16), one O(19), one O(2), one O(22), and one O(8) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the third Ta site, Ta(3) is bonded to one O(11), one O(13), one O(18), one O(23), one O(3), and one O(5) atom to form TaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. Al(1) is bonded to one O(12), one O(14), one O(17), one O(24), one O(4), and one O(6) atom to form AlO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(21), one O(22), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-37°. In the second Si site, Si(2) is bonded to one O(23), one O(24), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-37°. In the third Si site, Si(3) is bonded to one O(13), one O(17), one O(2), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-39°. In the fourth Si site, Si(4) is bonded to one O(1), one O(10), one O(14), and one O(18) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-36°. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(19), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 17-38°. In the sixth Si site, Si(6) is bonded to one O(12), one O(16), one O(20), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, and  a cornercorner with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-36°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(3), one Ta(1), and one Si(4) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Na(6), one Ta(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(4), one Ta(3), and one Si(6) atom. In the fourth O site, O(4) is bonded to one Na(2), one Na(4), one Na(5), one Al(1), and one Si(5) atom to form distorted ONa3AlSi trigonal bipyramids that share corners with two equivalent O(23)Na3TaSi trigonal bipyramids,  a cornercorner with one O(10)Na2TaSi trigonal pyramid, and  an edgeedge with one O(11)Na2TaSi trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(5), one Ta(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(6), one Al(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Na(6), one Ta(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Na(5), one Ta(2), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(6), one Ta(1), and one Si(3) atom. In the tenth O site, O(10) is bonded to one Na(2), one Na(6), one Ta(2), and one Si(4) atom to form distorted corner-sharing ONa2TaSi trigonal pyramids. In the eleventh O site, O(11) is bonded to one Na(1), one Na(5), one Ta(3), and one Si(5) atom to form distorted ONa2TaSi trigonal pyramids that share  an edgeedge with one O(4)Na3AlSi trigonal bipyramid and  a faceface with one O(23)Na3TaSi trigonal bipyramid. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(5), one Al(1), and one Si(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Ta(3), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Al(1), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a linear geometry to one Ta(1) and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Na(6), one Ta(2), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(4), one Al(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one Na(4), one Ta(3), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Na(3), one Ta(2), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Ta(1), and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(6), one Ta(1), and one Si(1) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Ta(2), and one Si(1) atom. In the twenty-third O site, O(23) is bonded to one Na(1), one Na(4), one Na(5), one Ta(3), and one Si(2) atom to form distorted ONa3TaSi trigonal bipyramids that share corners with two equivalent O(4)Na3AlSi trigonal bipyramids and  a faceface with one O(11)Na2TaSi trigonal pyramid. In the twenty-fourth O site, O(24) is bonded in a rectangular see-saw-like geometry to one Na(2), one Na(4), one Al(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na6Ta3Al(SiO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.956
_cell_length_b   8.988
_cell_length_c   8.995
_cell_angle_alpha   90.533
_cell_angle_beta   119.761
_cell_angle_gamma   119.381
_symmetry_Int_Tables_number   1
_cell_volume   516.169
_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
  Al  Al0  1  0.789  0.933  0.647  1.0
  Na  Na1  1  0.501  0.001  0.001  1.0
  Na  Na2  1  0.511  0.518  0.509  1.0
  Na  Na3  1  0.990  0.235  0.392  1.0
  Na  Na4  1  0.002  0.768  0.626  1.0
  Na  Na5  1  0.398  0.788  0.264  1.0
  Na  Na6  1  0.621  0.196  0.742  1.0
  O  O7  1  0.704  0.265  0.277  1.0
  O  O8  1  0.302  0.239  0.580  1.0
  O  O9  1  0.295  0.738  0.723  1.0
  O  O10  1  0.695  0.761  0.424  1.0
  O  O11  1  0.142  0.436  0.008  1.0
  O  O12  1  0.856  0.078  0.849  1.0
  O  O13  1  0.858  0.566  0.990  1.0
  O  O14  1  0.130  0.918  0.139  1.0
  O  O15  1  0.488  0.254  0.922  1.0
  O  O16  1  0.517  0.238  0.447  1.0
  O  O17  1  0.513  0.746  0.077  1.0
  O  O18  1  0.491  0.767  0.554  1.0
  O  O19  1  0.280  0.414  0.792  1.0
  O  O20  1  0.714  0.070  0.493  1.0
  O  O21  1  0.721  0.587  0.209  1.0
  O  O22  1  0.287  0.926  0.503  1.0
  O  O23  1  0.065  0.054  0.703  1.0
  O  O24  1  0.926  0.432  0.636  1.0
  O  O25  1  0.928  0.941  0.295  1.0
  O  O26  1  0.075  0.569  0.365  1.0
  O  O27  1  0.839  0.260  0.062  1.0
  O  O28  1  0.162  0.239  0.227  1.0
  O  O29  1  0.164  0.743  0.940  1.0
  O  O30  1  0.834  0.764  0.765  1.0
  Si  Si31  1  0.001  0.245  0.031  1.0
  Si  Si32  1  0.986  0.749  0.949  1.0
  Si  Si33  1  0.278  0.233  0.752  1.0
  Si  Si34  1  0.713  0.247  0.462  1.0
  Si  Si35  1  0.713  0.760  0.254  1.0
  Si  Si36  1  0.297  0.749  0.541  1.0
  Ta  Ta37  1  0.786  0.435  0.141  1.0
  Ta  Ta38  1  0.213  0.071  0.353  1.0
  Ta  Ta39  1  0.216  0.567  0.858  1.0
[/CIF]
.