SbPO4 crystallizes in the orthorhombic Pnma space group. Sb(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(1)O6 pentagonal pyramids, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with four equivalent Sb(1)O6 pentagonal pyramids and  an edgeedge with one Sb(1)O6 pentagonal pyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(1) atom.
SbPO4 crystallizes in the orthorhombic Pnma space group. Sb(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form distorted SbO6 pentagonal pyramids that share corners with four equivalent Sb(1)O6 pentagonal pyramids, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The Sb(1)-O(2) bond length is 2.18 Å. The Sb(1)-O(3) bond length is 2.31 Å. There are two shorter (2.17 Å) and two longer (2.65 Å) Sb(1)-O(1) bond lengths. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with four equivalent Sb(1)O6 pentagonal pyramids and  an edgeedge with one Sb(1)O6 pentagonal pyramid. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.53 Å. Both P(1)-O(1) bond lengths are 1.59 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(1) atom.