CaMnAsO5 is Esseneite-like structured and crystallizes in the orthorhombic P2_12_12_1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-61°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Mn(1), and one As(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one As(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mn(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mn(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Mn(1) atoms.
CaMnAsO5 is Esseneite-like structured and crystallizes in the orthorhombic P2_12_12_1 space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Ca(1)-O(1) bond length is 2.75 Å. The Ca(1)-O(5) bond length is 2.31 Å. There is one shorter (2.44 Å) and one longer (2.57 Å) Ca(1)-O(2) bond length. There is one shorter (2.57 Å) and one longer (2.67 Å) Ca(1)-O(3) bond length. There is one shorter (2.50 Å) and one longer (2.67 Å) Ca(1)-O(4) bond length. Mn(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. The Mn(1)-O(3) bond length is 2.20 Å. The Mn(1)-O(4) bond length is 2.18 Å. Both Mn(1)-O(1) bond lengths are 2.12 Å. Both Mn(1)-O(5) bond lengths are 1.88 Å. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-61°. The As(1)-O(1) bond length is 1.75 Å. The As(1)-O(2) bond length is 1.70 Å. The As(1)-O(3) bond length is 1.73 Å. The As(1)-O(4) bond length is 1.73 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Mn(1), and one As(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one As(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mn(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mn(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Mn(1) atoms.