Mn3(PO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O6 octahedra, corners with five equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 69°. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Mn(2)O6 octahedra and corners with five equivalent Mn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 47-55°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one P(1) atom.
Mn3(PO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O6 octahedra, corners with five equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 69°. The Mn(1)-O(1) bond length is 2.10 Å. The Mn(1)-O(2) bond length is 2.19 Å. The Mn(1)-O(3) bond length is 2.14 Å. There is one shorter (2.11 Å) and one longer (2.13 Å) Mn(1)-O(4) bond length. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra, corners with two equivalent Mn(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. Both Mn(2)-O(1) bond lengths are 2.12 Å. Both Mn(2)-O(2) bond lengths are 2.22 Å. Both Mn(2)-O(3) bond lengths are 2.32 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Mn(2)O6 octahedra and corners with five equivalent Mn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 47-55°. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(4) bond length is 1.54 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one P(1) atom.