SnSb3(PO4)4 crystallizes in the monoclinic Pm space group. Sn(1) is bonded to one O(1), one O(9), two equivalent O(11), and two equivalent O(5) atoms to form distorted SnO6 pentagonal pyramids that share corners with four equivalent Sb(2)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(12), one O(4), two equivalent O(2), and two equivalent O(8) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(3)O6 pentagonal pyramids,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. In the second Sb site, Sb(2) is bonded to one O(3), one O(7), two equivalent O(11), and two equivalent O(5) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sn(1)O6 pentagonal pyramids,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. In the third Sb site, Sb(3) is bonded to one O(10), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(1)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), and two equivalent O(2) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 pentagonal pyramid,  a cornercorner with one Sb(3)O6 pentagonal pyramid, corners with two equivalent Sb(1)O6 pentagonal pyramids, and  an edgeedge with one Sb(3)O6 pentagonal pyramid. In the second P site, P(2) is bonded to one O(6), one O(9), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 pentagonal pyramid,  a cornercorner with one Sb(3)O6 pentagonal pyramid, corners with two equivalent Sb(2)O6 pentagonal pyramids, and  an edgeedge with one Sn(1)O6 pentagonal pyramid. In the third P site, P(3) is bonded to one O(4), one O(7), and two equivalent O(8) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid,  a cornercorner with one Sb(2)O6 pentagonal pyramid, corners with two equivalent Sb(3)O6 pentagonal pyramids, and  an edgeedge with one Sb(1)O6 pentagonal pyramid. In the fourth P site, P(4) is bonded to one O(12), one O(3), and two equivalent O(11) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid,  a cornercorner with one Sb(2)O6 pentagonal pyramid, corners with two equivalent Sn(1)O6 pentagonal pyramids, and  an edgeedge with one Sb(2)O6 pentagonal pyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sn(1), one Sb(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Sb(3) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(3), and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Sb(3) and one P(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Sn(1), one Sb(2), and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(4) atom.
SnSb3(PO4)4 crystallizes in the monoclinic Pm space group. Sn(1) is bonded to one O(1), one O(9), two equivalent O(11), and two equivalent O(5) atoms to form distorted SnO6 pentagonal pyramids that share corners with four equivalent Sb(2)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The Sn(1)-O(1) bond length is 2.23 Å. The Sn(1)-O(9) bond length is 2.15 Å. Both Sn(1)-O(11) bond lengths are 2.52 Å. Both Sn(1)-O(5) bond lengths are 2.25 Å. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(12), one O(4), two equivalent O(2), and two equivalent O(8) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(3)O6 pentagonal pyramids,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The Sb(1)-O(12) bond length is 2.28 Å. The Sb(1)-O(4) bond length is 2.19 Å. Both Sb(1)-O(2) bond lengths are 2.54 Å. Both Sb(1)-O(8) bond lengths are 2.21 Å. In the second Sb site, Sb(2) is bonded to one O(3), one O(7), two equivalent O(11), and two equivalent O(5) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sn(1)O6 pentagonal pyramids,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The Sb(2)-O(3) bond length is 2.19 Å. The Sb(2)-O(7) bond length is 2.34 Å. Both Sb(2)-O(11) bond lengths are 2.24 Å. Both Sb(2)-O(5) bond lengths are 2.50 Å. In the third Sb site, Sb(3) is bonded to one O(10), one O(6), two equivalent O(2), and two equivalent O(8) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(1)O6 pentagonal pyramids,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The Sb(3)-O(10) bond length is 2.19 Å. The Sb(3)-O(6) bond length is 2.29 Å. Both Sb(3)-O(2) bond lengths are 2.21 Å. Both Sb(3)-O(8) bond lengths are 2.54 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), and two equivalent O(2) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 pentagonal pyramid,  a cornercorner with one Sb(3)O6 pentagonal pyramid, corners with two equivalent Sb(1)O6 pentagonal pyramids, and  an edgeedge with one Sb(3)O6 pentagonal pyramid. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(10) bond length is 1.54 Å. Both P(1)-O(2) bond lengths are 1.59 Å. In the second P site, P(2) is bonded to one O(6), one O(9), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O6 pentagonal pyramid,  a cornercorner with one Sb(3)O6 pentagonal pyramid, corners with two equivalent Sb(2)O6 pentagonal pyramids, and  an edgeedge with one Sn(1)O6 pentagonal pyramid. The P(2)-O(6) bond length is 1.53 Å. The P(2)-O(9) bond length is 1.55 Å. Both P(2)-O(5) bond lengths are 1.58 Å. In the third P site, P(3) is bonded to one O(4), one O(7), and two equivalent O(8) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid,  a cornercorner with one Sb(2)O6 pentagonal pyramid, corners with two equivalent Sb(3)O6 pentagonal pyramids, and  an edgeedge with one Sb(1)O6 pentagonal pyramid. The P(3)-O(4) bond length is 1.54 Å. The P(3)-O(7) bond length is 1.52 Å. Both P(3)-O(8) bond lengths are 1.59 Å. In the fourth P site, P(4) is bonded to one O(12), one O(3), and two equivalent O(11) atoms to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 pentagonal pyramid,  a cornercorner with one Sb(2)O6 pentagonal pyramid, corners with two equivalent Sn(1)O6 pentagonal pyramids, and  an edgeedge with one Sb(2)O6 pentagonal pyramid. The P(4)-O(12) bond length is 1.52 Å. The P(4)-O(3) bond length is 1.54 Å. Both P(4)-O(11) bond lengths are 1.59 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sn(1), one Sb(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Sb(3) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sb(1), one Sb(3), and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Sb(3) and one P(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Sn(1), one Sb(2), and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(4) atom.