MnPO4 crystallizes in the monoclinic Cc space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(5), one O(7), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the third Mn site, Mn(3) is bonded to one O(1), one O(10), one O(12), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(12), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(10), one O(11), one O(2), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. In the third P site, P(3) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. There are twelve inequivalent O sites. In the first O site, O(8) is bonded in a single-bond geometry to one P(2) atom. In the second O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(3) atom. In the third O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one P(2) atom. In the fourth O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one P(1) atom. In the sixth O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Mn(3), and one P(3) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(2) atom. In the eighth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(1) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Mn(2) and one P(3) atom. In the tenth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the eleventh O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(3) and one P(3) atom. In the twelfth O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Mn(3), and one P(1) atom.
MnPO4 crystallizes in the monoclinic Cc space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(5), one O(7), and one O(9) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The Mn(1)-O(1) bond length is 2.33 Å. The Mn(1)-O(11) bond length is 1.96 Å. The Mn(1)-O(5) bond length is 1.93 Å. The Mn(1)-O(7) bond length is 2.25 Å. The Mn(1)-O(9) bond length is 1.95 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The Mn(2)-O(1) bond length is 2.33 Å. The Mn(2)-O(2) bond length is 1.96 Å. The Mn(2)-O(3) bond length is 1.93 Å. The Mn(2)-O(4) bond length is 1.95 Å. The Mn(2)-O(7) bond length is 2.25 Å. In the third Mn site, Mn(3) is bonded to one O(1), one O(10), one O(12), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The Mn(3)-O(1) bond length is 2.34 Å. The Mn(3)-O(10) bond length is 1.96 Å. The Mn(3)-O(12) bond length is 1.94 Å. The Mn(3)-O(6) bond length is 1.95 Å. The Mn(3)-O(7) bond length is 2.27 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(12), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The P(1)-O(12) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.54 Å. The P(1)-O(7) bond length is 1.61 Å. In the second P site, P(2) is bonded to one O(10), one O(11), one O(2), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(2)O5 trigonal bipyramid, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. The P(2)-O(10) bond length is 1.56 Å. The P(2)-O(11) bond length is 1.56 Å. The P(2)-O(2) bond length is 1.56 Å. The P(2)-O(8) bond length is 1.52 Å. In the third P site, P(3) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The P(3)-O(1) bond length is 1.59 Å. The P(3)-O(4) bond length is 1.54 Å. The P(3)-O(6) bond length is 1.54 Å. The P(3)-O(9) bond length is 1.54 Å. There are twelve inequivalent O sites. In the first O site, O(8) is bonded in a single-bond geometry to one P(2) atom. In the second O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(3) atom. In the third O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one P(2) atom. In the fourth O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Mn(3) and one P(1) atom. In the sixth O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Mn(3), and one P(3) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(2) atom. In the eighth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(1) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Mn(2) and one P(3) atom. In the tenth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the eleventh O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(3) and one P(3) atom. In the twelfth O site, O(7) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Mn(3), and one P(1) atom.