The structure described by Na4FeAl3(SiO3)8 is Esseneite-derived structured and crystallizes in the monoclinic P2 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(12), two equivalent O(6), and two equivalent O(8) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms. Fe(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Al(2)O6 octahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Al(3)O6 octahedra. In the second Al site, Al(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. In the third Al site, Al(3) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-60°. In the second Si site, Si(2) is bonded to one O(10), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-59°. In the third Si site, Si(3) is bonded to one O(11), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-60°. In the fourth Si site, Si(4) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-63°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Al(1), one Al(3), and one Si(1) atom to form a mixture of distorted edge and corner-sharing ONaAl2Si tetrahedra. In the second O site, O(2) is bonded to one Na(1), one Fe(1), one Al(2), and one Si(2) atom to form a mixture of distorted edge and corner-sharing ONaAlFeSi tetrahedra. In the third O site, O(3) is bonded to one Na(4), one Al(1), one Al(3), and one Si(3) atom to form a mixture of distorted edge and corner-sharing ONaAl2Si tetrahedra. In the fourth O site, O(4) is bonded to one Na(3), one Fe(1), one Al(2), and one Si(4) atom to form a mixture of distorted edge and corner-sharing ONaAlFeSi tetrahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Si(2), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(2), one Na(4), one Si(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Na(3), one Fe(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Na(4), one Al(1), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Na(1), one Al(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Na(2), one Al(3), and one Si(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4Al3Fe(SiO3)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.718
_cell_length_b   5.310
_cell_length_c   9.457
_cell_angle_alpha   75.393
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   423.589
_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  0.800  0.500  0.500  1.0
  Na  Na1  1  0.300  0.000  0.000  1.0
  Na  Na2  1  0.200  0.000  0.500  1.0
  Na  Na3  1  0.700  0.500  0.000  1.0
  Al  Al4  1  0.904  0.000  0.000  1.0
  Al  Al5  1  0.598  0.000  0.500  1.0
  Al  Al6  1  0.096  0.500  0.000  1.0
  Fe  Fe7  1  0.403  0.500  0.500  1.0
  Si  Si8  1  0.088  0.690  0.287  1.0
  Si  Si9  1  0.594  0.186  0.792  1.0
  Si  Si10  1  0.088  0.310  0.713  1.0
  Si  Si11  1  0.594  0.814  0.208  1.0
  Si  Si12  1  0.906  0.812  0.710  1.0
  Si  Si13  1  0.407  0.311  0.208  1.0
  Si  Si14  1  0.906  0.188  0.290  1.0
  Si  Si15  1  0.407  0.689  0.792  1.0
  O  O16  1  0.073  0.768  0.107  1.0
  O  O17  1  0.583  0.259  0.611  1.0
  O  O18  1  0.073  0.232  0.893  1.0
  O  O19  1  0.583  0.741  0.389  1.0
  O  O20  1  0.925  0.732  0.890  1.0
  O  O21  1  0.426  0.218  0.388  1.0
  O  O22  1  0.925  0.268  0.110  1.0
  O  O23  1  0.426  0.782  0.612  1.0
  O  O24  1  0.006  0.405  0.352  1.0
  O  O25  1  0.507  0.904  0.855  1.0
  O  O26  1  0.006  0.595  0.648  1.0
  O  O27  1  0.507  0.096  0.145  1.0
  O  O28  1  0.992  0.095  0.648  1.0
  O  O29  1  0.494  0.595  0.149  1.0
  O  O30  1  0.992  0.905  0.352  1.0
  O  O31  1  0.494  0.405  0.851  1.0
  O  O32  1  0.258  0.691  0.355  1.0
  O  O33  1  0.762  0.181  0.864  1.0
  O  O34  1  0.258  0.309  0.645  1.0
  O  O35  1  0.762  0.819  0.136  1.0
  O  O36  1  0.739  0.816  0.638  1.0
  O  O37  1  0.239  0.320  0.137  1.0
  O  O38  1  0.739  0.184  0.362  1.0
  O  O39  1  0.239  0.680  0.863  1.0
[/CIF]
.
The structure described by Na4FeAl3(SiO3)8 is Esseneite-derived structured and crystallizes in the monoclinic P2 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(11), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(12), two equivalent O(6), and two equivalent O(8) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(6), and two equivalent O(8) atoms. Fe(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Al(2)O6 octahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Al(3)O6 octahedra. In the second Al site, Al(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. In the third Al site, Al(3) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-60°. In the second Si site, Si(2) is bonded to one O(10), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-59°. In the third Si site, Si(3) is bonded to one O(11), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-60°. In the fourth Si site, Si(4) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra,  a cornercorner with one Al(3)O6 octahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-63°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Al(1), one Al(3), and one Si(1) atom to form a mixture of distorted edge and corner-sharing ONaAl2Si tetrahedra. In the second O site, O(2) is bonded to one Na(1), one Fe(1), one Al(2), and one Si(2) atom to form a mixture of distorted edge and corner-sharing ONaAlFeSi tetrahedra. In the third O site, O(3) is bonded to one Na(4), one Al(1), one Al(3), and one Si(3) atom to form a mixture of distorted edge and corner-sharing ONaAl2Si tetrahedra. In the fourth O site, O(4) is bonded to one Na(3), one Fe(1), one Al(2), and one Si(4) atom to form a mixture of distorted edge and corner-sharing ONaAlFeSi tetrahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(2), one Na(4), one Si(2), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Na(1), one Na(3), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(2), one Na(4), one Si(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Na(3), one Fe(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Na(4), one Al(1), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Na(1), one Al(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Na(2), one Al(3), and one Si(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4Al3Fe(SiO3)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.718
_cell_length_b   5.310
_cell_length_c   9.457
_cell_angle_alpha   75.393
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   423.589
_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  0.800  0.500  0.500  1.0
  Na  Na1  1  0.300  0.000  0.000  1.0
  Na  Na2  1  0.200  0.000  0.500  1.0
  Na  Na3  1  0.700  0.500  0.000  1.0
  Al  Al4  1  0.904  0.000  0.000  1.0
  Al  Al5  1  0.598  0.000  0.500  1.0
  Al  Al6  1  0.096  0.500  0.000  1.0
  Fe  Fe7  1  0.403  0.500  0.500  1.0
  Si  Si8  1  0.088  0.690  0.287  1.0
  Si  Si9  1  0.594  0.186  0.792  1.0
  Si  Si10  1  0.088  0.310  0.713  1.0
  Si  Si11  1  0.594  0.814  0.208  1.0
  Si  Si12  1  0.906  0.812  0.710  1.0
  Si  Si13  1  0.407  0.311  0.208  1.0
  Si  Si14  1  0.906  0.188  0.290  1.0
  Si  Si15  1  0.407  0.689  0.792  1.0
  O  O16  1  0.073  0.768  0.107  1.0
  O  O17  1  0.583  0.259  0.611  1.0
  O  O18  1  0.073  0.232  0.893  1.0
  O  O19  1  0.583  0.741  0.389  1.0
  O  O20  1  0.925  0.732  0.890  1.0
  O  O21  1  0.426  0.218  0.388  1.0
  O  O22  1  0.925  0.268  0.110  1.0
  O  O23  1  0.426  0.782  0.612  1.0
  O  O24  1  0.006  0.405  0.352  1.0
  O  O25  1  0.507  0.904  0.855  1.0
  O  O26  1  0.006  0.595  0.648  1.0
  O  O27  1  0.507  0.096  0.145  1.0
  O  O28  1  0.992  0.095  0.648  1.0
  O  O29  1  0.494  0.595  0.149  1.0
  O  O30  1  0.992  0.905  0.352  1.0
  O  O31  1  0.494  0.405  0.851  1.0
  O  O32  1  0.258  0.691  0.355  1.0
  O  O33  1  0.762  0.181  0.864  1.0
  O  O34  1  0.258  0.309  0.645  1.0
  O  O35  1  0.762  0.819  0.136  1.0
  O  O36  1  0.739  0.816  0.638  1.0
  O  O37  1  0.239  0.320  0.137  1.0
  O  O38  1  0.739  0.184  0.362  1.0
  O  O39  1  0.239  0.680  0.863  1.0
[/CIF]
.