Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with two equivalent P(1)O4 tetrahedra. Zn(1) is bonded in a 3-coordinate geometry to one O(4), one O(5), and one O(7) atom. Sn(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom.
Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. The Sr(1)-O(2) bond length is 2.70 Å. The Sr(1)-O(3) bond length is 2.88 Å. The Sr(1)-O(4) bond length is 2.62 Å. The Sr(1)-O(8) bond length is 2.52 Å. There is one shorter (2.56 Å) and one longer (3.10 Å) Sr(1)-O(1) bond length. There is one shorter (2.36 Å) and one longer (2.51 Å) Sr(1)-O(6) bond length. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(8) atoms to form MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and edges with two equivalent P(1)O4 tetrahedra. Both Mg(1)-O(1) bond lengths are 2.18 Å. Both Mg(1)-O(2) bond lengths are 2.09 Å. Both Mg(1)-O(8) bond lengths are 2.15 Å. Zn(1) is bonded in a 3-coordinate geometry to one O(4), one O(5), and one O(7) atom. The Zn(1)-O(4) bond length is 2.03 Å. The Zn(1)-O(5) bond length is 2.04 Å. The Zn(1)-O(7) bond length is 2.22 Å. Sn(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. The Sn(1)-O(3) bond length is 2.29 Å. The Sn(1)-O(5) bond length is 2.39 Å. The Sn(1)-O(7) bond length is 2.20 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.60 Å. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. The P(2)-O(4) bond length is 1.58 Å. The P(2)-O(5) bond length is 1.57 Å. The P(2)-O(6) bond length is 1.52 Å. The P(2)-O(8) bond length is 1.55 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sn(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Zn(1), one Sn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom.