The material structure described by Sr5Ca5P6(O12Cl)2 crystallizes in the monoclinic Pm space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(13), one O(3), two equivalent O(10), two equivalent O(8), and two equivalent Cl(1) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(14), two equivalent O(11), two equivalent O(9), and two equivalent Cl(1) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(18), one O(5), two equivalent O(10), two equivalent O(9), and two equivalent Cl(1) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(16), one O(6), two equivalent O(11), two equivalent O(7), and two equivalent Cl(1) atoms. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(17), one O(4), two equivalent O(12), two equivalent O(8), and two equivalent Cl(1) atoms. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(16), one O(17), one O(18), one O(2), and one O(3) atom. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 5-coordinate geometry to one O(15), two equivalent O(12), two equivalent O(7), and two equivalent Cl(1) atoms. There are six inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(13), and two equivalent O(7) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(14), one O(2), and two equivalent O(8) atoms. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(15), one O(3), and two equivalent O(9) atoms. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(16), one O(4), and two equivalent O(10) atoms. In the fifth P site, P(5) is bonded in a tetrahedral geometry to one O(17), one O(5), and two equivalent O(11) atoms. In the sixth P site, P(6) is bonded in a tetrahedral geometry to one O(18), one O(6), and two equivalent O(12) atoms. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Ca(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one P(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Ca(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Sr(5), two equivalent Ca(2), and one P(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(3), two equivalent Ca(2), and one P(5) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Sr(4), two equivalent Ca(2), and one P(6) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sr(4), one Ca(2), one Ca(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Ca(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Ca(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(4), one Ca(1), and one P(5) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Sr(5), one Ca(1), one Ca(3), and one P(6) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), two equivalent Ca(2), and one P(1) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra and  an edgeedge with one O(14)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the fourteenth O site, O(14) is bonded to one Sr(2), two equivalent Ca(2), and one P(2) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra and  an edgeedge with one O(13)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 43°. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded to one Sr(4), two equivalent Ca(1), and one P(4) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(17)SrCa2P tetrahedra, and  an edgeedge with one O(18)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the seventeenth O site, O(17) is bonded to one Sr(5), two equivalent Ca(1), and one P(5) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(16)SrCa2P tetrahedra, and  an edgeedge with one O(18)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the eighteenth O site, O(18) is bonded to one Sr(3), two equivalent Ca(1), and one P(6) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(16)SrCa2P tetrahedra, and  an edgeedge with one O(17)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. Cl(1) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sr(5), and one Ca(3) atom to form ClSr5Ca octahedra that share  a cornercorner with one O(13)SrCa2P tetrahedra,  a cornercorner with one O(14)SrCa2P tetrahedra,  a cornercorner with one O(16)SrCa2P tetrahedra,  a cornercorner with one O(17)SrCa2P tetrahedra,  a cornercorner with one O(18)SrCa2P tetrahedra, and faces with two equivalent Cl(1)Sr5Ca octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr5Ca5P6(ClO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.033
_cell_length_b   9.870
_cell_length_c   9.882
_cell_angle_alpha   60.070
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   594.463
_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
  Sr  Sr0  1  0.500  0.747  0.252  1.0
  Sr  Sr1  1  0.500  0.002  0.747  1.0
  Sr  Sr2  1  0.000  0.748  0.999  1.0
  Sr  Sr3  1  0.000  0.253  0.749  1.0
  Sr  Sr4  1  0.000  0.998  0.253  1.0
  Ca  Ca5  1  0.749  0.333  0.333  1.0
  Ca  Ca6  1  0.249  0.667  0.667  1.0
  Ca  Ca7  1  0.751  0.667  0.667  1.0
  Ca  Ca8  1  0.251  0.333  0.333  1.0
  Ca  Ca9  1  0.500  0.267  0.990  1.0
  P  P10  1  0.500  0.413  0.623  1.0
  P  P11  1  0.500  0.966  0.413  1.0
  P  P12  1  0.500  0.619  0.967  1.0
  P  P13  1  0.000  0.586  0.379  1.0
  P  P14  1  0.000  0.034  0.586  1.0
  P  P15  1  0.000  0.378  0.033  1.0
  Cl  Cl16  1  0.253  0.003  0.000  1.0
  Cl  Cl17  1  0.747  0.003  0.000  1.0
  O  O18  1  0.500  0.355  0.502  1.0
  O  O19  1  0.500  0.144  0.355  1.0
  O  O20  1  0.500  0.501  0.146  1.0
  O  O21  1  0.000  0.644  0.500  1.0
  O  O22  1  0.000  0.856  0.644  1.0
  O  O23  1  0.000  0.500  0.855  1.0
  O  O24  1  0.676  0.355  0.732  1.0
  O  O25  1  0.678  0.915  0.357  1.0
  O  O26  1  0.678  0.726  0.916  1.0
  O  O27  1  0.178  0.644  0.272  1.0
  O  O28  1  0.178  0.084  0.644  1.0
  O  O29  1  0.181  0.273  0.080  1.0
  O  O30  1  0.822  0.644  0.272  1.0
  O  O31  1  0.822  0.084  0.644  1.0
  O  O32  1  0.819  0.273  0.080  1.0
  O  O33  1  0.324  0.355  0.732  1.0
  O  O34  1  0.322  0.915  0.357  1.0
  O  O35  1  0.322  0.726  0.916  1.0
  O  O36  1  0.500  0.595  0.540  1.0
  O  O37  1  0.500  0.866  0.596  1.0
  O  O38  1  0.500  0.532  0.871  1.0
  O  O39  1  0.000  0.404  0.462  1.0
  O  O40  1  0.000  0.134  0.404  1.0
  O  O41  1  0.000  0.460  0.134  1.0
[/CIF]
.
The material structure described by Sr5Ca5P6(O12Cl)2 crystallizes in the monoclinic Pm space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(13), one O(3), two equivalent O(10), two equivalent O(8), and two equivalent Cl(1) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(14), two equivalent O(11), two equivalent O(9), and two equivalent Cl(1) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(18), one O(5), two equivalent O(10), two equivalent O(9), and two equivalent Cl(1) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(16), one O(6), two equivalent O(11), two equivalent O(7), and two equivalent Cl(1) atoms. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(17), one O(4), two equivalent O(12), two equivalent O(8), and two equivalent Cl(1) atoms. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(16), one O(17), one O(18), one O(2), and one O(3) atom. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 5-coordinate geometry to one O(15), two equivalent O(12), two equivalent O(7), and two equivalent Cl(1) atoms. There are six inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(13), and two equivalent O(7) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(14), one O(2), and two equivalent O(8) atoms. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(15), one O(3), and two equivalent O(9) atoms. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(16), one O(4), and two equivalent O(10) atoms. In the fifth P site, P(5) is bonded in a tetrahedral geometry to one O(17), one O(5), and two equivalent O(11) atoms. In the sixth P site, P(6) is bonded in a tetrahedral geometry to one O(18), one O(6), and two equivalent O(12) atoms. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Ca(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one P(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Ca(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Sr(5), two equivalent Ca(2), and one P(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(3), two equivalent Ca(2), and one P(5) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Sr(4), two equivalent Ca(2), and one P(6) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sr(4), one Ca(2), one Ca(3), and one P(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Ca(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Ca(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one Ca(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(4), one Ca(1), and one P(5) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Sr(5), one Ca(1), one Ca(3), and one P(6) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), two equivalent Ca(2), and one P(1) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra and  an edgeedge with one O(14)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the fourteenth O site, O(14) is bonded to one Sr(2), two equivalent Ca(2), and one P(2) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra and  an edgeedge with one O(13)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 43°. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded to one Sr(4), two equivalent Ca(1), and one P(4) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(17)SrCa2P tetrahedra, and  an edgeedge with one O(18)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the seventeenth O site, O(17) is bonded to one Sr(5), two equivalent Ca(1), and one P(5) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(16)SrCa2P tetrahedra, and  an edgeedge with one O(18)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the eighteenth O site, O(18) is bonded to one Sr(3), two equivalent Ca(1), and one P(6) atom to form distorted OSrCa2P tetrahedra that share corners with two equivalent Cl(1)Sr5Ca octahedra,  an edgeedge with one O(16)SrCa2P tetrahedra, and  an edgeedge with one O(17)SrCa2P tetrahedra. The corner-sharing octahedral tilt angles are 44°. Cl(1) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sr(5), and one Ca(3) atom to form ClSr5Ca octahedra that share  a cornercorner with one O(13)SrCa2P tetrahedra,  a cornercorner with one O(14)SrCa2P tetrahedra,  a cornercorner with one O(16)SrCa2P tetrahedra,  a cornercorner with one O(17)SrCa2P tetrahedra,  a cornercorner with one O(18)SrCa2P tetrahedra, and faces with two equivalent Cl(1)Sr5Ca octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr5Ca5P6(ClO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.033
_cell_length_b   9.870
_cell_length_c   9.882
_cell_angle_alpha   60.070
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   594.463
_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
  Sr  Sr0  1  0.500  0.747  0.252  1.0
  Sr  Sr1  1  0.500  0.002  0.747  1.0
  Sr  Sr2  1  0.000  0.748  0.999  1.0
  Sr  Sr3  1  0.000  0.253  0.749  1.0
  Sr  Sr4  1  0.000  0.998  0.253  1.0
  Ca  Ca5  1  0.749  0.333  0.333  1.0
  Ca  Ca6  1  0.249  0.667  0.667  1.0
  Ca  Ca7  1  0.751  0.667  0.667  1.0
  Ca  Ca8  1  0.251  0.333  0.333  1.0
  Ca  Ca9  1  0.500  0.267  0.990  1.0
  P  P10  1  0.500  0.413  0.623  1.0
  P  P11  1  0.500  0.966  0.413  1.0
  P  P12  1  0.500  0.619  0.967  1.0
  P  P13  1  0.000  0.586  0.379  1.0
  P  P14  1  0.000  0.034  0.586  1.0
  P  P15  1  0.000  0.378  0.033  1.0
  Cl  Cl16  1  0.253  0.003  0.000  1.0
  Cl  Cl17  1  0.747  0.003  0.000  1.0
  O  O18  1  0.500  0.355  0.502  1.0
  O  O19  1  0.500  0.144  0.355  1.0
  O  O20  1  0.500  0.501  0.146  1.0
  O  O21  1  0.000  0.644  0.500  1.0
  O  O22  1  0.000  0.856  0.644  1.0
  O  O23  1  0.000  0.500  0.855  1.0
  O  O24  1  0.676  0.355  0.732  1.0
  O  O25  1  0.678  0.915  0.357  1.0
  O  O26  1  0.678  0.726  0.916  1.0
  O  O27  1  0.178  0.644  0.272  1.0
  O  O28  1  0.178  0.084  0.644  1.0
  O  O29  1  0.181  0.273  0.080  1.0
  O  O30  1  0.822  0.644  0.272  1.0
  O  O31  1  0.822  0.084  0.644  1.0
  O  O32  1  0.819  0.273  0.080  1.0
  O  O33  1  0.324  0.355  0.732  1.0
  O  O34  1  0.322  0.915  0.357  1.0
  O  O35  1  0.322  0.726  0.916  1.0
  O  O36  1  0.500  0.595  0.540  1.0
  O  O37  1  0.500  0.866  0.596  1.0
  O  O38  1  0.500  0.532  0.871  1.0
  O  O39  1  0.000  0.404  0.462  1.0
  O  O40  1  0.000  0.134  0.404  1.0
  O  O41  1  0.000  0.460  0.134  1.0
[/CIF]
.