MnAlO3 crystallizes in the orthorhombic Pnma space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and corners with eight equivalent Al(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 55-56°. Al(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AlO4 trigonal pyramids that share corners with eight equivalent Mn(1)O6 octahedra and corners with two equivalent Al(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 62-83°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Al(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mn(1) and two equivalent Al(1) atoms.
MnAlO3 crystallizes in the orthorhombic Pnma space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and corners with eight equivalent Al(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 55-56°. Both Mn(1)-O(2) bond lengths are 2.35 Å. There are two shorter (1.93 Å) and two longer (1.99 Å) Mn(1)-O(1) bond lengths. Al(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AlO4 trigonal pyramids that share corners with eight equivalent Mn(1)O6 octahedra and corners with two equivalent Al(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 62-83°. Both Al(1)-O(1) bond lengths are 1.81 Å. Both Al(1)-O(2) bond lengths are 1.81 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Al(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mn(1) and two equivalent Al(1) atoms.