The structure described by Na8BeAl4Si7(O12Br)2 crystallizes in the tetragonal P-4 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), one O(3), and one Br(1) atom to form NaBrO3 tetrahedra that share  a cornercorner with one Na(1)BrO3 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(4), one O(5), one O(6), and one Br(1) atom to form distorted NaBrO3 tetrahedra that share  a cornercorner with one Na(2)BrO3 tetrahedra,  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. Be(1) is bonded to four equivalent O(4) atoms to form BeO4 tetrahedra that share corners with four equivalent Na(2)BrO3 tetrahedra and corners with four equivalent Si(3)O4 tetrahedra. Al(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(1)BrO3 tetrahedra and corners with four equivalent Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to four equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(1)BrO3 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to four equivalent O(6) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(2)BrO3 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Be(1), and one Si(3) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(3) atom. In the third O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(4) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(3) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. Br(1) is bonded in a tetrahedral geometry to two equivalent Na(1) and two equivalent Na(2) atoms. is represented by the CIF file [CIF]
data_Na8BeAl4Si7(BrO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.043
_cell_length_b   9.043
_cell_length_c   9.094
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   743.703
_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  0.194  0.315  0.059  1.0
  Na  Na1  1  0.685  0.194  0.941  1.0
  Na  Na2  1  0.315  0.806  0.941  1.0
  Na  Na3  1  0.806  0.685  0.059  1.0
  Na  Na4  1  0.709  0.814  0.555  1.0
  Na  Na5  1  0.186  0.709  0.445  1.0
  Na  Na6  1  0.814  0.291  0.445  1.0
  Na  Na7  1  0.291  0.186  0.555  1.0
  Be  Be8  1  0.000  0.000  0.500  1.0
  Al  Al9  1  0.752  0.499  0.750  1.0
  Al  Al10  1  0.501  0.752  0.250  1.0
  Al  Al11  1  0.499  0.248  0.250  1.0
  Al  Al12  1  0.248  0.501  0.750  1.0
  Si  Si13  1  0.000  0.000  0.000  1.0
  Si  Si14  1  0.500  0.500  0.000  1.0
  Si  Si15  1  0.759  0.997  0.255  1.0
  Si  Si16  1  0.241  0.003  0.255  1.0
  Si  Si17  1  0.500  0.500  0.500  1.0
  Si  Si18  1  0.997  0.241  0.745  1.0
  Si  Si19  1  0.003  0.759  0.745  1.0
  Br  Br20  1  0.500  0.000  0.753  1.0
  Br  Br21  1  0.000  0.500  0.247  1.0
  O  O22  1  0.354  0.457  0.904  1.0
  O  O23  1  0.854  0.340  0.795  1.0
  O  O24  1  0.146  0.660  0.795  1.0
  O  O25  1  0.962  0.856  0.899  1.0
  O  O26  1  0.646  0.543  0.904  1.0
  O  O27  1  0.543  0.354  0.096  1.0
  O  O28  1  0.144  0.962  0.101  1.0
  O  O29  1  0.038  0.144  0.899  1.0
  O  O30  1  0.856  0.038  0.101  1.0
  O  O31  1  0.457  0.646  0.096  1.0
  O  O32  1  0.660  0.854  0.205  1.0
  O  O33  1  0.857  0.960  0.396  1.0
  O  O34  1  0.341  0.856  0.284  1.0
  O  O35  1  0.659  0.144  0.284  1.0
  O  O36  1  0.340  0.146  0.205  1.0
  O  O37  1  0.457  0.353  0.405  1.0
  O  O38  1  0.143  0.040  0.396  1.0
  O  O39  1  0.040  0.857  0.604  1.0
  O  O40  1  0.647  0.457  0.595  1.0
  O  O41  1  0.543  0.647  0.405  1.0
  O  O42  1  0.960  0.143  0.604  1.0
  O  O43  1  0.353  0.543  0.595  1.0
  O  O44  1  0.144  0.341  0.716  1.0
  O  O45  1  0.856  0.659  0.716  1.0
[/CIF]
.
The structure described by Na8BeAl4Si7(O12Br)2 crystallizes in the tetragonal P-4 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), one O(3), and one Br(1) atom to form NaBrO3 tetrahedra that share  a cornercorner with one Na(1)BrO3 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(4), one O(5), one O(6), and one Br(1) atom to form distorted NaBrO3 tetrahedra that share  a cornercorner with one Na(2)BrO3 tetrahedra,  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. Be(1) is bonded to four equivalent O(4) atoms to form BeO4 tetrahedra that share corners with four equivalent Na(2)BrO3 tetrahedra and corners with four equivalent Si(3)O4 tetrahedra. Al(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to four equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(1)BrO3 tetrahedra and corners with four equivalent Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to four equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(1)BrO3 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Na(1)BrO3 tetrahedra, corners with two equivalent Na(2)BrO3 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to four equivalent O(6) atoms to form SiO4 tetrahedra that share corners with four equivalent Na(2)BrO3 tetrahedra and corners with four equivalent Al(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Be(1), and one Si(3) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(3) atom. In the third O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Al(1), and one Si(4) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(2) atom. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Si(3) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. Br(1) is bonded in a tetrahedral geometry to two equivalent Na(1) and two equivalent Na(2) atoms. is represented by the CIF file [CIF]
data_Na8BeAl4Si7(BrO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.043
_cell_length_b   9.043
_cell_length_c   9.094
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   743.703
_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  0.194  0.315  0.059  1.0
  Na  Na1  1  0.685  0.194  0.941  1.0
  Na  Na2  1  0.315  0.806  0.941  1.0
  Na  Na3  1  0.806  0.685  0.059  1.0
  Na  Na4  1  0.709  0.814  0.555  1.0
  Na  Na5  1  0.186  0.709  0.445  1.0
  Na  Na6  1  0.814  0.291  0.445  1.0
  Na  Na7  1  0.291  0.186  0.555  1.0
  Be  Be8  1  0.000  0.000  0.500  1.0
  Al  Al9  1  0.752  0.499  0.750  1.0
  Al  Al10  1  0.501  0.752  0.250  1.0
  Al  Al11  1  0.499  0.248  0.250  1.0
  Al  Al12  1  0.248  0.501  0.750  1.0
  Si  Si13  1  0.000  0.000  0.000  1.0
  Si  Si14  1  0.500  0.500  0.000  1.0
  Si  Si15  1  0.759  0.997  0.255  1.0
  Si  Si16  1  0.241  0.003  0.255  1.0
  Si  Si17  1  0.500  0.500  0.500  1.0
  Si  Si18  1  0.997  0.241  0.745  1.0
  Si  Si19  1  0.003  0.759  0.745  1.0
  Br  Br20  1  0.500  0.000  0.753  1.0
  Br  Br21  1  0.000  0.500  0.247  1.0
  O  O22  1  0.354  0.457  0.904  1.0
  O  O23  1  0.854  0.340  0.795  1.0
  O  O24  1  0.146  0.660  0.795  1.0
  O  O25  1  0.962  0.856  0.899  1.0
  O  O26  1  0.646  0.543  0.904  1.0
  O  O27  1  0.543  0.354  0.096  1.0
  O  O28  1  0.144  0.962  0.101  1.0
  O  O29  1  0.038  0.144  0.899  1.0
  O  O30  1  0.856  0.038  0.101  1.0
  O  O31  1  0.457  0.646  0.096  1.0
  O  O32  1  0.660  0.854  0.205  1.0
  O  O33  1  0.857  0.960  0.396  1.0
  O  O34  1  0.341  0.856  0.284  1.0
  O  O35  1  0.659  0.144  0.284  1.0
  O  O36  1  0.340  0.146  0.205  1.0
  O  O37  1  0.457  0.353  0.405  1.0
  O  O38  1  0.143  0.040  0.396  1.0
  O  O39  1  0.040  0.857  0.604  1.0
  O  O40  1  0.647  0.457  0.595  1.0
  O  O41  1  0.543  0.647  0.405  1.0
  O  O42  1  0.960  0.143  0.604  1.0
  O  O43  1  0.353  0.543  0.595  1.0
  O  O44  1  0.144  0.341  0.716  1.0
  O  O45  1  0.856  0.659  0.716  1.0
[/CIF]
.