FePO4 is quartz (alpha)-derived structured and crystallizes in the monoclinic Pc space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra and corners with three equivalent Fe(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with three equivalent Fe(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom.
FePO4 is quartz (alpha)-derived structured and crystallizes in the monoclinic Pc space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Fe(1)-O(1) bond length is 1.86 Å. The Fe(1)-O(3) bond length is 1.86 Å. The Fe(1)-O(4) bond length is 1.87 Å. The Fe(1)-O(7) bond length is 1.84 Å. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Fe(2)-O(2) bond length is 1.86 Å. The Fe(2)-O(5) bond length is 1.87 Å. The Fe(2)-O(6) bond length is 1.84 Å. The Fe(2)-O(8) bond length is 1.86 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra and corners with three equivalent Fe(2)O4 tetrahedra. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(5) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.52 Å. The P(1)-O(8) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with three equivalent Fe(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.54 Å. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.53 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom.