The structure described by Ca2Be2P2O9F crystallizes in the monoclinic Pc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), one O(9), and one F(1) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), and one F(1) atom. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(4), one O(5), and one O(9) atom to form BeO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent P(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(2), one O(3), one O(6), and one F(1) atom to form BeO3F tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Be(2)O3F tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Be(2)O3F tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Be(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(2), one Be(2), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Be(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(2), one Be(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Be(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Be(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one Be(1) atom. F(1) is bonded in a distorted single-bond geometry to one Ca(1), one Ca(2), and one Be(2) atom. is represented by the CIF file [CIF]
data_Ca2Be2P2O9F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.773
_cell_length_b   4.866
_cell_length_c   9.790
_cell_angle_alpha   89.670
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   370.307
_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
  Ca  Ca0  1  0.637  0.996  0.169  1.0
  Ca  Ca1  1  0.134  0.002  0.330  1.0
  Ca  Ca2  1  0.866  0.002  0.830  1.0
  Ca  Ca3  1  0.363  0.996  0.669  1.0
  Be  Be4  1  0.335  0.541  0.160  1.0
  Be  Be5  1  0.836  0.460  0.339  1.0
  Be  Be6  1  0.164  0.460  0.839  1.0
  Be  Be7  1  0.665  0.541  0.660  1.0
  P  P8  1  0.481  0.471  0.417  1.0
  P  P9  1  0.979  0.530  0.081  1.0
  P  P10  1  0.021  0.530  0.581  1.0
  P  P11  1  0.519  0.471  0.917  1.0
  O  O12  1  0.469  0.649  0.043  1.0
  O  O13  1  0.968  0.354  0.456  1.0
  O  O14  1  0.032  0.354  0.956  1.0
  O  O15  1  0.531  0.649  0.543  1.0
  O  O16  1  0.645  0.337  0.355  1.0
  O  O17  1  0.142  0.667  0.145  1.0
  O  O18  1  0.858  0.667  0.645  1.0
  O  O19  1  0.355  0.337  0.855  1.0
  O  O20  1  0.405  0.671  0.306  1.0
  O  O21  1  0.904  0.328  0.192  1.0
  O  O22  1  0.096  0.328  0.692  1.0
  O  O23  1  0.595  0.671  0.806  1.0
  O  O24  1  0.353  0.243  0.456  1.0
  O  O25  1  0.852  0.755  0.040  1.0
  O  O26  1  0.148  0.755  0.540  1.0
  O  O27  1  0.647  0.243  0.956  1.0
  O  O28  1  0.346  0.212  0.183  1.0
  O  O29  1  0.654  0.212  0.683  1.0
  F  F30  1  0.839  0.784  0.328  1.0
  F  F31  1  0.161  0.784  0.828  1.0
[/CIF]
.
The structure described by Ca2Be2P2O9F crystallizes in the monoclinic Pc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), one O(9), and one F(1) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), one O(9), and one F(1) atom. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(4), one O(5), and one O(9) atom to form BeO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent P(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(2), one O(3), one O(6), and one F(1) atom to form BeO3F tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Be(2)O3F tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with two equivalent Be(2)O3F tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Be(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(2), one Be(2), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Be(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(2), one Be(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Be(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Be(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ca(1), one Ca(2), and one Be(1) atom. F(1) is bonded in a distorted single-bond geometry to one Ca(1), one Ca(2), and one Be(2) atom. is represented by the CIF file [CIF]
data_Ca2Be2P2O9F
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.773
_cell_length_b   4.866
_cell_length_c   9.790
_cell_angle_alpha   89.670
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   370.307
_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
  Ca  Ca0  1  0.637  0.996  0.169  1.0
  Ca  Ca1  1  0.134  0.002  0.330  1.0
  Ca  Ca2  1  0.866  0.002  0.830  1.0
  Ca  Ca3  1  0.363  0.996  0.669  1.0
  Be  Be4  1  0.335  0.541  0.160  1.0
  Be  Be5  1  0.836  0.460  0.339  1.0
  Be  Be6  1  0.164  0.460  0.839  1.0
  Be  Be7  1  0.665  0.541  0.660  1.0
  P  P8  1  0.481  0.471  0.417  1.0
  P  P9  1  0.979  0.530  0.081  1.0
  P  P10  1  0.021  0.530  0.581  1.0
  P  P11  1  0.519  0.471  0.917  1.0
  O  O12  1  0.469  0.649  0.043  1.0
  O  O13  1  0.968  0.354  0.456  1.0
  O  O14  1  0.032  0.354  0.956  1.0
  O  O15  1  0.531  0.649  0.543  1.0
  O  O16  1  0.645  0.337  0.355  1.0
  O  O17  1  0.142  0.667  0.145  1.0
  O  O18  1  0.858  0.667  0.645  1.0
  O  O19  1  0.355  0.337  0.855  1.0
  O  O20  1  0.405  0.671  0.306  1.0
  O  O21  1  0.904  0.328  0.192  1.0
  O  O22  1  0.096  0.328  0.692  1.0
  O  O23  1  0.595  0.671  0.806  1.0
  O  O24  1  0.353  0.243  0.456  1.0
  O  O25  1  0.852  0.755  0.040  1.0
  O  O26  1  0.148  0.755  0.540  1.0
  O  O27  1  0.647  0.243  0.956  1.0
  O  O28  1  0.346  0.212  0.183  1.0
  O  O29  1  0.654  0.212  0.683  1.0
  F  F30  1  0.839  0.784  0.328  1.0
  F  F31  1  0.161  0.784  0.828  1.0
[/CIF]
.