The material described by Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(14), one O(15), one O(3), one O(5), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(16), one O(2), one O(4), and one O(8) atom. Mg(1) is bonded to one O(3), one O(5), one O(6), and one O(8) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent P(2)O4 tetrahedra and  an edgeedge with one P(4)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 3-coordinate geometry to one Sn(2), one O(13), one O(4), and one O(7) atom. In the second Zn site, Zn(2) is bonded in a 3-coordinate geometry to one O(12), one O(15), and one O(2) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 2-coordinate geometry to one O(12) and one O(6) atom. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to one Zn(1), one O(13), one O(7), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(2), and one O(9) atom. In the second P site, P(2) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O4 trigonal pyramids. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(10), one O(14), one O(15), and one O(7) atom. In the fourth P site, P(4) is bonded to one O(16), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O4 trigonal pyramid. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(2), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Mg(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Zn(1), and one P(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Sn(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Zn(2), one Sn(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(2), and one P(2) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to one Sr(1) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Sr(2) and one P(4) atom. is represented by the CIF file [CIF]
data_Sr2MgZn2Sn2(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.452
_cell_length_b   8.179
_cell_length_c   9.872
_cell_angle_alpha   110.089
_cell_angle_beta   99.848
_cell_angle_gamma   85.528
_symmetry_Int_Tables_number   1
_cell_volume   407.194
_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  0.146  0.736  0.032  1.0
  Sr  Sr1  1  0.857  0.244  0.998  1.0
  Mg  Mg2  1  0.089  0.724  0.701  1.0
  Zn  Zn3  1  0.985  0.270  0.583  1.0
  Zn  Zn4  1  0.914  0.660  0.364  1.0
  Sn  Sn5  1  0.525  0.855  0.482  1.0
  Sn  Sn6  1  0.387  0.208  0.465  1.0
  P  P7  1  0.390  0.451  0.246  1.0
  P  P8  1  0.637  0.549  0.775  1.0
  P  P9  1  0.759  0.964  0.241  1.0
  P  P10  1  0.252  0.044  0.772  1.0
  O  O11  1  0.767  0.512  0.911  1.0
  O  O12  1  0.672  0.465  0.242  1.0
  O  O13  1  0.776  0.694  0.755  1.0
  O  O14  1  0.040  0.172  0.743  1.0
  O  O15  1  0.356  0.592  0.780  1.0
  O  O16  1  0.248  0.877  0.625  1.0
  O  O17  1  0.763  0.126  0.389  1.0
  O  O18  1  0.162  0.963  0.876  1.0
  O  O19  1  0.333  0.284  0.275  1.0
  O  O20  1  0.822  0.014  0.116  1.0
  O  O21  1  0.228  0.456  0.105  1.0
  O  O22  1  0.303  0.612  0.378  1.0
  O  O23  1  0.656  0.384  0.629  1.0
  O  O24  1  0.504  0.879  0.215  1.0
  O  O25  1  0.970  0.831  0.269  1.0
  O  O26  1  0.506  0.121  0.813  1.0
[/CIF]
.
The material described by Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(14), one O(15), one O(3), one O(5), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(16), one O(2), one O(4), and one O(8) atom. Mg(1) is bonded to one O(3), one O(5), one O(6), and one O(8) atom to form distorted MgO4 trigonal pyramids that share corners with two equivalent P(2)O4 tetrahedra and  an edgeedge with one P(4)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 3-coordinate geometry to one Sn(2), one O(13), one O(4), and one O(7) atom. In the second Zn site, Zn(2) is bonded in a 3-coordinate geometry to one O(12), one O(15), and one O(2) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 2-coordinate geometry to one O(12) and one O(6) atom. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to one Zn(1), one O(13), one O(7), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(2), and one O(9) atom. In the second P site, P(2) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O4 trigonal pyramids. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(10), one O(14), one O(15), and one O(7) atom. In the fourth P site, P(4) is bonded to one O(16), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O4 trigonal pyramid. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(2), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Mg(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Zn(1), and one P(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Sn(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(1) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Zn(2), one Sn(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(2), and one P(2) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to one Sr(1) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Sr(1), one Zn(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Sr(2) and one P(4) atom. is represented by the CIF file [CIF]
data_Sr2MgZn2Sn2(PO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.452
_cell_length_b   8.179
_cell_length_c   9.872
_cell_angle_alpha   110.089
_cell_angle_beta   99.848
_cell_angle_gamma   85.528
_symmetry_Int_Tables_number   1
_cell_volume   407.194
_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  0.146  0.736  0.032  1.0
  Sr  Sr1  1  0.857  0.244  0.998  1.0
  Mg  Mg2  1  0.089  0.724  0.701  1.0
  Zn  Zn3  1  0.985  0.270  0.583  1.0
  Zn  Zn4  1  0.914  0.660  0.364  1.0
  Sn  Sn5  1  0.525  0.855  0.482  1.0
  Sn  Sn6  1  0.387  0.208  0.465  1.0
  P  P7  1  0.390  0.451  0.246  1.0
  P  P8  1  0.637  0.549  0.775  1.0
  P  P9  1  0.759  0.964  0.241  1.0
  P  P10  1  0.252  0.044  0.772  1.0
  O  O11  1  0.767  0.512  0.911  1.0
  O  O12  1  0.672  0.465  0.242  1.0
  O  O13  1  0.776  0.694  0.755  1.0
  O  O14  1  0.040  0.172  0.743  1.0
  O  O15  1  0.356  0.592  0.780  1.0
  O  O16  1  0.248  0.877  0.625  1.0
  O  O17  1  0.763  0.126  0.389  1.0
  O  O18  1  0.162  0.963  0.876  1.0
  O  O19  1  0.333  0.284  0.275  1.0
  O  O20  1  0.822  0.014  0.116  1.0
  O  O21  1  0.228  0.456  0.105  1.0
  O  O22  1  0.303  0.612  0.378  1.0
  O  O23  1  0.656  0.384  0.629  1.0
  O  O24  1  0.504  0.879  0.215  1.0
  O  O25  1  0.970  0.831  0.269  1.0
  O  O26  1  0.506  0.121  0.813  1.0
[/CIF]
.