The structure described by Na6FeAl4(Si4O13)2 is Chalcostibite-derived structured and crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(12), one O(21), one O(26), one O(3), and one O(9) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(25), one O(5), and one O(7) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(13), one O(16), one O(18), one O(19), one O(22), one O(4), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(11), one O(14), one O(19), one O(23), and one O(5) atom. In the fifth Na site, Na(5) is bonded in a 5-coordinate geometry to one O(16), one O(17), one O(2), one O(20), and one O(22) atom. In the sixth Na site, Na(6) is bonded to one O(1), one O(15), one O(18), one O(24), and one O(6) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(4)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,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. Fe(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(18), one O(26), and one O(9) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(24), one O(4), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the second Al site, Al(2) is bonded to one O(10), one O(12), one O(14), and one O(20) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the third Al site, Al(3) is bonded to one O(11), one O(17), one O(21), and one O(23) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the fourth Al site, Al(4) is bonded to one O(13), one O(22), one O(25), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(2), one O(21), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(10), one O(16), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(11), one O(12), one O(18), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the fifth Si site, Si(5) is bonded to one O(13), one O(15), one O(17), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the sixth Si site, Si(6) is bonded to one O(15), one O(16), one O(19), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the seventh Si site, Si(7) is bonded to one O(19), one O(22), one O(24), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the eighth Si site, Si(8) is bonded to one O(20), one O(23), one O(25), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(6), one Fe(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(5), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Si(2), and one Si(8) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Al(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Na(4), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(6), one Al(4), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Al(1), and one Si(5) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(3), one Si(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one Si(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Al(3), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(3), one Al(4), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Na(4), one Al(2), and one Si(1) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Na(6), one Si(5), and one Si(6) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Na(5), one Si(3), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(5), one Al(3), and one Si(5) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(3), one Na(6), one Fe(1), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), one Si(6), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal non-coplanar geometry to one Na(5), one Al(2), and one Si(8) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Na(1), one Al(3), and one Si(1) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Al(4), and one Si(7) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Na(4), one Al(3), and one Si(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one Na(6), one Al(1), and one Si(7) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Na(2), one Al(4), and one Si(8) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one Si(7) atom. is represented by the CIF file [CIF]
data_Na6Al4Fe(Si4O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.979
_cell_length_b   8.449
_cell_length_c   10.546
_cell_angle_alpha   110.985
_cell_angle_beta   89.941
_cell_angle_gamma   118.177
_symmetry_Int_Tables_number   1
_cell_volume   572.811
_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
  Na  Na0  1  0.148  0.302  0.880  1.0
  Na  Na1  1  0.279  0.541  0.558  1.0
  Na  Na2  1  0.481  0.935  0.166  1.0
  Na  Na3  1  0.544  0.066  0.833  1.0
  Na  Na4  1  0.737  0.458  0.442  1.0
  Na  Na5  1  0.845  0.699  0.121  1.0
  Al  Al6  1  0.159  0.705  0.346  1.0
  Al  Al7  1  0.454  0.296  0.654  1.0
  Al  Al8  1  0.750  0.884  0.654  1.0
  Al  Al9  1  0.867  0.116  0.346  1.0
  Fe  Fe10  1  0.985  1.000  1.000  1.0
  Si  Si11  1  0.142  0.884  0.655  1.0
  Si  Si12  1  0.151  0.703  0.869  1.0
  Si  Si13  1  0.260  0.116  0.345  1.0
  Si  Si14  1  0.535  0.701  0.871  1.0
  Si  Si15  1  0.549  0.700  0.347  1.0
  Si  Si16  1  0.449  0.295  0.130  1.0
  Si  Si17  1  0.836  0.300  0.130  1.0
  Si  Si18  1  0.849  0.300  0.653  1.0
  O  O19  1  0.061  0.799  0.985  1.0
  O  O20  1  0.063  0.720  0.497  1.0
  O  O21  1  0.023  0.463  0.791  1.0
  O  O22  1  0.273  0.925  0.326  1.0
  O  O23  1  0.195  0.784  0.746  1.0
  O  O24  1  0.042  0.058  0.289  1.0
  O  O25  1  0.325  0.630  0.360  1.0
  O  O26  1  0.364  0.748  0.936  1.0
  O  O27  1  0.264  0.198  0.014  1.0
  O  O28  1  0.344  0.280  0.503  1.0
  O  O29  1  0.581  0.783  0.749  1.0
  O  O30  1  0.430  0.464  0.797  1.0
  O  O31  1  0.654  0.901  0.325  1.0
  O  O32  1  0.346  0.076  0.674  1.0
  O  O33  1  0.559  0.536  0.208  1.0
  O  O34  1  0.412  0.215  0.253  1.0
  O  O35  1  0.659  0.710  0.482  1.0
  O  O36  1  0.712  0.807  0.998  1.0
  O  O37  1  0.618  0.252  0.064  1.0
  O  O38  1  0.695  0.370  0.640  1.0
  O  O39  1  0.983  0.942  0.712  1.0
  O  O40  1  0.799  0.218  0.252  1.0
  O  O41  1  0.751  0.098  0.674  1.0
  O  O42  1  0.967  0.537  0.203  1.0
  O  O43  1  0.949  0.289  0.518  1.0
  O  O44  1  0.909  0.195  0.003  1.0
[/CIF]
.
The structure described by Na6FeAl4(Si4O13)2 is Chalcostibite-derived structured and crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(12), one O(21), one O(26), one O(3), and one O(9) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(25), one O(5), and one O(7) atom. In the third Na site, Na(3) is bonded in a 7-coordinate geometry to one O(13), one O(16), one O(18), one O(19), one O(22), one O(4), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(11), one O(14), one O(19), one O(23), and one O(5) atom. In the fifth Na site, Na(5) is bonded in a 5-coordinate geometry to one O(16), one O(17), one O(2), one O(20), and one O(22) atom. In the sixth Na site, Na(6) is bonded to one O(1), one O(15), one O(18), one O(24), and one O(6) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(4)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,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. Fe(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(18), one O(26), and one O(9) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(24), one O(4), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the second Al site, Al(2) is bonded to one O(10), one O(12), one O(14), and one O(20) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the third Al site, Al(3) is bonded to one O(11), one O(17), one O(21), and one O(23) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the fourth Al site, Al(4) is bonded to one O(13), one O(22), one O(25), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(2), one O(21), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(10), one O(16), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(11), one O(12), one O(18), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the fifth Si site, Si(5) is bonded to one O(13), one O(15), one O(17), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the sixth Si site, Si(6) is bonded to one O(15), one O(16), one O(19), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the seventh Si site, Si(7) is bonded to one O(19), one O(22), one O(24), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  a cornercorner with one Na(6)O5 trigonal bipyramid. In the eighth Si site, Si(8) is bonded to one O(20), one O(23), one O(25), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Na(1)O5 trigonal bipyramid. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(6), one Fe(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(5), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Si(2), and one Si(8) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(3), one Al(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(2), one Na(4), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(6), one Al(4), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Al(1), and one Si(5) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(3), one Si(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one Si(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Al(2), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Al(3), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(2), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(3), one Al(4), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Na(4), one Al(2), and one Si(1) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Na(6), one Si(5), and one Si(6) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Na(3), one Na(5), one Si(3), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(5), one Al(3), and one Si(5) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(3), one Na(6), one Fe(1), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Na(3), one Na(4), one Si(6), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal non-coplanar geometry to one Na(5), one Al(2), and one Si(8) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Na(1), one Al(3), and one Si(1) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Al(4), and one Si(7) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Na(4), one Al(3), and one Si(8) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal planar geometry to one Na(6), one Al(1), and one Si(7) atom. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Na(2), one Al(4), and one Si(8) atom. In the twenty-sixth O site, O(26) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one Si(7) atom. is represented by the CIF file [CIF]
data_Na6Al4Fe(Si4O13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.979
_cell_length_b   8.449
_cell_length_c   10.546
_cell_angle_alpha   110.985
_cell_angle_beta   89.941
_cell_angle_gamma   118.177
_symmetry_Int_Tables_number   1
_cell_volume   572.811
_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
  Na  Na0  1  0.148  0.302  0.880  1.0
  Na  Na1  1  0.279  0.541  0.558  1.0
  Na  Na2  1  0.481  0.935  0.166  1.0
  Na  Na3  1  0.544  0.066  0.833  1.0
  Na  Na4  1  0.737  0.458  0.442  1.0
  Na  Na5  1  0.845  0.699  0.121  1.0
  Al  Al6  1  0.159  0.705  0.346  1.0
  Al  Al7  1  0.454  0.296  0.654  1.0
  Al  Al8  1  0.750  0.884  0.654  1.0
  Al  Al9  1  0.867  0.116  0.346  1.0
  Fe  Fe10  1  0.985  1.000  1.000  1.0
  Si  Si11  1  0.142  0.884  0.655  1.0
  Si  Si12  1  0.151  0.703  0.869  1.0
  Si  Si13  1  0.260  0.116  0.345  1.0
  Si  Si14  1  0.535  0.701  0.871  1.0
  Si  Si15  1  0.549  0.700  0.347  1.0
  Si  Si16  1  0.449  0.295  0.130  1.0
  Si  Si17  1  0.836  0.300  0.130  1.0
  Si  Si18  1  0.849  0.300  0.653  1.0
  O  O19  1  0.061  0.799  0.985  1.0
  O  O20  1  0.063  0.720  0.497  1.0
  O  O21  1  0.023  0.463  0.791  1.0
  O  O22  1  0.273  0.925  0.326  1.0
  O  O23  1  0.195  0.784  0.746  1.0
  O  O24  1  0.042  0.058  0.289  1.0
  O  O25  1  0.325  0.630  0.360  1.0
  O  O26  1  0.364  0.748  0.936  1.0
  O  O27  1  0.264  0.198  0.014  1.0
  O  O28  1  0.344  0.280  0.503  1.0
  O  O29  1  0.581  0.783  0.749  1.0
  O  O30  1  0.430  0.464  0.797  1.0
  O  O31  1  0.654  0.901  0.325  1.0
  O  O32  1  0.346  0.076  0.674  1.0
  O  O33  1  0.559  0.536  0.208  1.0
  O  O34  1  0.412  0.215  0.253  1.0
  O  O35  1  0.659  0.710  0.482  1.0
  O  O36  1  0.712  0.807  0.998  1.0
  O  O37  1  0.618  0.252  0.064  1.0
  O  O38  1  0.695  0.370  0.640  1.0
  O  O39  1  0.983  0.942  0.712  1.0
  O  O40  1  0.799  0.218  0.252  1.0
  O  O41  1  0.751  0.098  0.674  1.0
  O  O42  1  0.967  0.537  0.203  1.0
  O  O43  1  0.949  0.289  0.518  1.0
  O  O44  1  0.909  0.195  0.003  1.0
[/CIF]
.