MgMnPO5 crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(7), and one O(8) atom. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(9) atom. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), 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, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-52°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-52°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(2), one Mn(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mg(2), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one Mn(2) atom.
MgMnPO5 crystallizes in the triclinic P1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(7), and one O(8) atom. The Mg(1)-O(10) bond length is 1.96 Å. The Mg(1)-O(2) bond length is 2.11 Å. The Mg(1)-O(4) bond length is 2.03 Å. The Mg(1)-O(7) bond length is 2.09 Å. The Mg(1)-O(8) bond length is 2.20 Å. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(9) atom. The Mg(2)-O(1) bond length is 2.03 Å. The Mg(2)-O(3) bond length is 2.12 Å. The Mg(2)-O(5) bond length is 2.20 Å. The Mg(2)-O(6) bond length is 2.09 Å. The Mg(2)-O(9) bond length is 1.96 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), 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, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The Mn(1)-O(10) bond length is 1.85 Å. The Mn(1)-O(2) bond length is 2.29 Å. The Mn(1)-O(4) bond length is 2.17 Å. The Mn(1)-O(5) bond length is 1.99 Å. The Mn(1)-O(7) bond length is 2.02 Å. The Mn(1)-O(9) bond length is 1.85 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The Mn(2)-O(1) bond length is 2.17 Å. The Mn(2)-O(10) bond length is 1.85 Å. The Mn(2)-O(3) bond length is 2.29 Å. The Mn(2)-O(6) bond length is 2.02 Å. The Mn(2)-O(8) bond length is 1.99 Å. The Mn(2)-O(9) bond length is 1.85 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-52°. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(7) bond length is 1.54 Å. The P(1)-O(8) bond length is 1.55 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-52°. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.54 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(2), one Mn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(2), one Mn(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mg(2), one Mn(1), and one Mn(2) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one Mn(2) atom.