MgMn2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(4), one O(5), one O(6), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 50°. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 50°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 42-53°. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 40-52°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) and one O(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Mn(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Mg(1), one Mn(1), one Mn(2), and one H(1) atom.
MgMn2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(4), one O(5), one O(6), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. The Mg(1)-O(10) bond length is 2.06 Å. The Mg(1)-O(4) bond length is 2.10 Å. The Mg(1)-O(5) bond length is 1.99 Å. The Mg(1)-O(6) bond length is 2.01 Å. The Mg(1)-O(8) bond length is 2.16 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 50°. The Mn(1)-O(1) bond length is 1.96 Å. The Mn(1)-O(10) bond length is 2.06 Å. The Mn(1)-O(2) bond length is 2.25 Å. The Mn(1)-O(3) bond length is 1.92 Å. The Mn(1)-O(8) bond length is 2.01 Å. The Mn(1)-O(9) bond length is 2.24 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(4), one O(5), one O(6), and one O(7) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 50°. The Mn(2)-O(1) bond length is 1.95 Å. The Mn(2)-O(10) bond length is 2.09 Å. The Mn(2)-O(4) bond length is 1.98 Å. The Mn(2)-O(5) bond length is 2.27 Å. The Mn(2)-O(6) bond length is 2.15 Å. The Mn(2)-O(7) bond length is 1.88 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 42-53°. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.58 Å. The P(1)-O(5) bond length is 1.53 Å. The P(1)-O(8) bond length is 1.59 Å. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 40-52°. The P(2)-O(3) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.56 Å. The P(2)-O(9) bond length is 1.54 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) and one O(2) atom. The H(1)-O(10) bond length is 1.01 Å. The H(1)-O(2) bond length is 1.69 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 1.00 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(1) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Mn(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Mg(1), one Mn(1), one Mn(2), and one H(1) atom.