The structure described by Na4Ca4Be4AlSi7(O6F)4 crystallizes in the tetragonal I-4 space group. Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), two equivalent O(6), and two equivalent F(1) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), two equivalent O(1), two equivalent O(3), and one F(1) atom. Be(1) is bonded to one O(3), one O(4), one O(5), and one F(1) atom to form BeO3F tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. Al(1) is bonded to four equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent Si(2)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded to four equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(1)O3F tetrahedra. In the second Si site, Si(1) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form SiO4 tetrahedra that share corners with two equivalent Be(1)O3F tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the third Si site, Si(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O3F tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Be(1), and one Si(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one Si(2) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Al(1), and one Si(2) atom. In the fourth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Na(1), one Si(1), and one Si(2) atom. In the fifth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Be(1), and one Si(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one Na(1), one Ca(1), one Be(1), and one Si(3) atom. F(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Ca(1), and one Be(1) atom. is represented by the CIF card [CIF]
data_Na4Ca4Be4AlSi7(O6F)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.036
_cell_length_b   9.036
_cell_length_c   9.036
_cell_angle_alpha   107.925
_cell_angle_beta   107.925
_cell_angle_gamma   112.610
_symmetry_Int_Tables_number   1
_cell_volume   566.721
_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  0.662  0.510  0.674  1.0
  Na  Na1  1  0.836  0.988  0.326  1.0
  Na  Na2  1  0.490  0.164  0.152  1.0
  Na  Na3  1  0.012  0.338  0.848  1.0
  Ca  Ca4  1  0.335  0.500  0.346  1.0
  Ca  Ca5  1  0.154  0.989  0.654  1.0
  Ca  Ca6  1  0.500  0.846  0.835  1.0
  Ca  Ca7  1  0.011  0.665  0.165  1.0
  Be  Be8  1  0.723  0.865  0.644  1.0
  Be  Be9  1  0.221  0.079  0.356  1.0
  Be  Be10  1  0.135  0.779  0.858  1.0
  Be  Be11  1  0.921  0.277  0.142  1.0
  Al  Al12  1  0.500  0.500  0.000  1.0
  Si  Si13  1  0.494  0.994  0.500  1.0
  Si  Si14  1  0.006  0.506  0.500  1.0
  Si  Si15  1  0.728  0.587  0.367  1.0
  Si  Si16  1  0.220  0.361  0.633  1.0
  Si  Si17  1  0.413  0.780  0.141  1.0
  Si  Si18  1  0.639  0.272  0.859  1.0
  Si  Si19  1  0.000  0.000  0.000  1.0
  O  O20  1  0.380  0.531  0.642  1.0
  O  O21  1  0.890  0.739  0.358  1.0
  O  O22  1  0.469  0.110  0.849  1.0
  O  O23  1  0.261  0.620  0.151  1.0
  O  O24  1  0.532  0.450  0.178  1.0
  O  O25  1  0.272  0.354  0.822  1.0
  O  O26  1  0.550  0.728  0.082  1.0
  O  O27  1  0.646  0.468  0.918  1.0
  O  O28  1  0.530  0.866  0.583  1.0
  O  O29  1  0.283  0.947  0.417  1.0
  O  O30  1  0.134  0.717  0.664  1.0
  O  O31  1  0.053  0.470  0.336  1.0
  O  O32  1  0.784  0.879  0.843  1.0
  O  O33  1  0.036  0.941  0.157  1.0
  O  O34  1  0.121  0.964  0.905  1.0
  O  O35  1  0.059  0.216  0.095  1.0
  O  O36  1  0.667  0.666  0.509  1.0
  O  O37  1  0.157  0.158  0.491  1.0
  O  O38  1  0.334  0.843  0.001  1.0
  O  O39  1  0.842  0.333  0.999  1.0
  O  O40  1  0.788  0.447  0.417  1.0
  O  O41  1  0.030  0.370  0.583  1.0
  O  O42  1  0.553  0.970  0.341  1.0
  O  O43  1  0.630  0.212  0.659  1.0
  F  F44  1  0.377  0.238  0.355  1.0
  F  F45  1  0.883  0.022  0.645  1.0
  F  F46  1  0.762  0.117  0.139  1.0
  F  F47  1  0.978  0.623  0.861  1.0
[/CIF]
.
The structure described by Na4Ca4Be4AlSi7(O6F)4 crystallizes in the tetragonal I-4 space group. Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), two equivalent O(6), and two equivalent F(1) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), two equivalent O(1), two equivalent O(3), and one F(1) atom. Be(1) is bonded to one O(3), one O(4), one O(5), and one F(1) atom to form BeO3F tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. Al(1) is bonded to four equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent Si(2)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded to four equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(1)O3F tetrahedra. In the second Si site, Si(1) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form SiO4 tetrahedra that share corners with two equivalent Be(1)O3F tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the third Si site, Si(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O3F tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Be(1), and one Si(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one Si(2) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Al(1), and one Si(2) atom. In the fourth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Na(1), one Si(1), and one Si(2) atom. In the fifth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Be(1), and one Si(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one Na(1), one Ca(1), one Be(1), and one Si(3) atom. F(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Ca(1), and one Be(1) atom. is represented by the CIF card [CIF]
data_Na4Ca4Be4AlSi7(O6F)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.036
_cell_length_b   9.036
_cell_length_c   9.036
_cell_angle_alpha   107.925
_cell_angle_beta   107.925
_cell_angle_gamma   112.610
_symmetry_Int_Tables_number   1
_cell_volume   566.721
_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  0.662  0.510  0.674  1.0
  Na  Na1  1  0.836  0.988  0.326  1.0
  Na  Na2  1  0.490  0.164  0.152  1.0
  Na  Na3  1  0.012  0.338  0.848  1.0
  Ca  Ca4  1  0.335  0.500  0.346  1.0
  Ca  Ca5  1  0.154  0.989  0.654  1.0
  Ca  Ca6  1  0.500  0.846  0.835  1.0
  Ca  Ca7  1  0.011  0.665  0.165  1.0
  Be  Be8  1  0.723  0.865  0.644  1.0
  Be  Be9  1  0.221  0.079  0.356  1.0
  Be  Be10  1  0.135  0.779  0.858  1.0
  Be  Be11  1  0.921  0.277  0.142  1.0
  Al  Al12  1  0.500  0.500  0.000  1.0
  Si  Si13  1  0.494  0.994  0.500  1.0
  Si  Si14  1  0.006  0.506  0.500  1.0
  Si  Si15  1  0.728  0.587  0.367  1.0
  Si  Si16  1  0.220  0.361  0.633  1.0
  Si  Si17  1  0.413  0.780  0.141  1.0
  Si  Si18  1  0.639  0.272  0.859  1.0
  Si  Si19  1  0.000  0.000  0.000  1.0
  O  O20  1  0.380  0.531  0.642  1.0
  O  O21  1  0.890  0.739  0.358  1.0
  O  O22  1  0.469  0.110  0.849  1.0
  O  O23  1  0.261  0.620  0.151  1.0
  O  O24  1  0.532  0.450  0.178  1.0
  O  O25  1  0.272  0.354  0.822  1.0
  O  O26  1  0.550  0.728  0.082  1.0
  O  O27  1  0.646  0.468  0.918  1.0
  O  O28  1  0.530  0.866  0.583  1.0
  O  O29  1  0.283  0.947  0.417  1.0
  O  O30  1  0.134  0.717  0.664  1.0
  O  O31  1  0.053  0.470  0.336  1.0
  O  O32  1  0.784  0.879  0.843  1.0
  O  O33  1  0.036  0.941  0.157  1.0
  O  O34  1  0.121  0.964  0.905  1.0
  O  O35  1  0.059  0.216  0.095  1.0
  O  O36  1  0.667  0.666  0.509  1.0
  O  O37  1  0.157  0.158  0.491  1.0
  O  O38  1  0.334  0.843  0.001  1.0
  O  O39  1  0.842  0.333  0.999  1.0
  O  O40  1  0.788  0.447  0.417  1.0
  O  O41  1  0.030  0.370  0.583  1.0
  O  O42  1  0.553  0.970  0.341  1.0
  O  O43  1  0.630  0.212  0.659  1.0
  F  F44  1  0.377  0.238  0.355  1.0
  F  F45  1  0.883  0.022  0.645  1.0
  F  F46  1  0.762  0.117  0.139  1.0
  F  F47  1  0.978  0.623  0.861  1.0
[/CIF]
.