The material described by NaCa2Al2As2O11F4 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 4-coordinate geometry to one O(3), one O(5), one O(8), and two equivalent F(1) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one F(1), and two equivalent F(2) atoms. Al(1) is bonded to one O(1), one O(2), one O(4), one O(7), one F(1), and one F(2) atom to form AlO4F2 octahedra that share  a cornercorner with one Al(1)O4F2 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(3), one O(8), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with two equivalent Al(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 52°. In the second As site, As(2) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form AsO4 tetrahedra that share corners with two equivalent Al(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 59°. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a water-like geometry to one Na(1) and one As(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Ca(1) and one Al(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one As(1) atom. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Al(1) and one As(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one As(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one As(2) atom. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one As(2) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Na(1), one Ca(1), and one Al(1) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one Al(1) atom. is represented by the CIF card [CIF]
data_NaCa2Al2As2O11F4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.928
_cell_length_b   5.620
_cell_length_c   9.706
_cell_angle_alpha   74.909
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   575.596
_cell_formula_units_Z   2
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  0.750  0.498  0.829  1.0
  Na  Na1  1  0.250  0.502  0.171  1.0
  Ca  Ca2  1  0.914  0.107  0.642  1.0
  Ca  Ca3  1  0.414  0.893  0.358  1.0
  Ca  Ca4  1  0.086  0.893  0.358  1.0
  Ca  Ca5  1  0.586  0.107  0.642  1.0
  Al  Al6  1  0.909  0.485  0.237  1.0
  Al  Al7  1  0.409  0.515  0.763  1.0
  Al  Al8  1  0.091  0.515  0.763  1.0
  Al  Al9  1  0.591  0.485  0.237  1.0
  As  As10  1  0.750  0.875  0.003  1.0
  As  As11  1  0.250  0.125  0.997  1.0
  As  As12  1  0.750  0.677  0.460  1.0
  As  As13  1  0.250  0.323  0.540  1.0
  O  O14  1  0.750  0.367  0.276  1.0
  O  O15  1  0.250  0.633  0.724  1.0
  O  O16  1  0.069  0.797  0.845  1.0
  O  O17  1  0.569  0.203  0.155  1.0
  O  O18  1  0.931  0.203  0.155  1.0
  O  O19  1  0.431  0.797  0.845  1.0
  O  O20  1  0.750  0.953  0.820  1.0
  O  O21  1  0.250  0.047  0.180  1.0
  O  O22  1  0.877  0.698  0.058  1.0
  O  O23  1  0.377  0.302  0.942  1.0
  O  O24  1  0.123  0.302  0.942  1.0
  O  O25  1  0.623  0.698  0.058  1.0
  O  O26  1  0.750  0.386  0.573  1.0
  O  O27  1  0.250  0.614  0.427  1.0
  O  O28  1  0.750  0.885  0.558  1.0
  O  O29  1  0.250  0.115  0.442  1.0
  O  O30  1  0.120  0.295  0.647  1.0
  O  O31  1  0.620  0.705  0.353  1.0
  O  O32  1  0.880  0.705  0.353  1.0
  O  O33  1  0.380  0.295  0.647  1.0
  O  O34  1  0.750  0.159  0.048  1.0
  O  O35  1  0.250  0.841  0.952  1.0
  F  F36  1  0.936  0.402  0.781  1.0
  F  F37  1  0.436  0.598  0.219  1.0
  F  F38  1  0.064  0.598  0.219  1.0
  F  F39  1  0.564  0.402  0.781  1.0
  F  F40  1  0.031  0.770  0.605  1.0
  F  F41  1  0.531  0.230  0.395  1.0
  F  F42  1  0.969  0.230  0.395  1.0
  F  F43  1  0.469  0.770  0.605  1.0
[/CIF]
.
The material described by NaCa2Al2As2O11F4 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 4-coordinate geometry to one O(3), one O(5), one O(8), and two equivalent F(1) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), one F(1), and two equivalent F(2) atoms. Al(1) is bonded to one O(1), one O(2), one O(4), one O(7), one F(1), and one F(2) atom to form AlO4F2 octahedra that share  a cornercorner with one Al(1)O4F2 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(3), one O(8), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with two equivalent Al(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 52°. In the second As site, As(2) is bonded to one O(5), one O(6), and two equivalent O(7) atoms to form AsO4 tetrahedra that share corners with two equivalent Al(1)O4F2 octahedra. The corner-sharing octahedral tilt angles are 59°. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a water-like geometry to one Na(1) and one As(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Ca(1) and one Al(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one As(1) atom. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Al(1) and one As(1) atom. In the sixth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one As(2) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one As(2) atom. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one As(2) atom. There are two inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Na(1), one Ca(1), and one Al(1) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one Al(1) atom. is represented by the CIF card [CIF]
data_NaCa2Al2As2O11F4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.928
_cell_length_b   5.620
_cell_length_c   9.706
_cell_angle_alpha   74.909
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   575.596
_cell_formula_units_Z   2
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  0.750  0.498  0.829  1.0
  Na  Na1  1  0.250  0.502  0.171  1.0
  Ca  Ca2  1  0.914  0.107  0.642  1.0
  Ca  Ca3  1  0.414  0.893  0.358  1.0
  Ca  Ca4  1  0.086  0.893  0.358  1.0
  Ca  Ca5  1  0.586  0.107  0.642  1.0
  Al  Al6  1  0.909  0.485  0.237  1.0
  Al  Al7  1  0.409  0.515  0.763  1.0
  Al  Al8  1  0.091  0.515  0.763  1.0
  Al  Al9  1  0.591  0.485  0.237  1.0
  As  As10  1  0.750  0.875  0.003  1.0
  As  As11  1  0.250  0.125  0.997  1.0
  As  As12  1  0.750  0.677  0.460  1.0
  As  As13  1  0.250  0.323  0.540  1.0
  O  O14  1  0.750  0.367  0.276  1.0
  O  O15  1  0.250  0.633  0.724  1.0
  O  O16  1  0.069  0.797  0.845  1.0
  O  O17  1  0.569  0.203  0.155  1.0
  O  O18  1  0.931  0.203  0.155  1.0
  O  O19  1  0.431  0.797  0.845  1.0
  O  O20  1  0.750  0.953  0.820  1.0
  O  O21  1  0.250  0.047  0.180  1.0
  O  O22  1  0.877  0.698  0.058  1.0
  O  O23  1  0.377  0.302  0.942  1.0
  O  O24  1  0.123  0.302  0.942  1.0
  O  O25  1  0.623  0.698  0.058  1.0
  O  O26  1  0.750  0.386  0.573  1.0
  O  O27  1  0.250  0.614  0.427  1.0
  O  O28  1  0.750  0.885  0.558  1.0
  O  O29  1  0.250  0.115  0.442  1.0
  O  O30  1  0.120  0.295  0.647  1.0
  O  O31  1  0.620  0.705  0.353  1.0
  O  O32  1  0.880  0.705  0.353  1.0
  O  O33  1  0.380  0.295  0.647  1.0
  O  O34  1  0.750  0.159  0.048  1.0
  O  O35  1  0.250  0.841  0.952  1.0
  F  F36  1  0.936  0.402  0.781  1.0
  F  F37  1  0.436  0.598  0.219  1.0
  F  F38  1  0.064  0.598  0.219  1.0
  F  F39  1  0.564  0.402  0.781  1.0
  F  F40  1  0.031  0.770  0.605  1.0
  F  F41  1  0.531  0.230  0.395  1.0
  F  F42  1  0.969  0.230  0.395  1.0
  F  F43  1  0.469  0.770  0.605  1.0
[/CIF]
.