CaMgSiO4 crystallizes in the orthorhombic Pnma space group. Ca(1) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Mg(1)O6 octahedra. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-55°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Mg(1), and one Si(1) atom.
CaMgSiO4 crystallizes in the orthorhombic Pnma space group. Ca(1) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There is one shorter (2.41 Å) and one longer (2.68 Å) Ca(1)-O(1) bond length. Both Ca(1)-O(2) bond lengths are 2.29 Å. There is one shorter (2.49 Å) and one longer (2.76 Å) Ca(1)-O(3) bond length. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Si(1)O4 tetrahedra and edges with two equivalent Mg(1)O6 octahedra. Both Mg(1)-O(1) bond lengths are 2.40 Å. Both Mg(1)-O(2) bond lengths are 1.99 Å. Both Mg(1)-O(3) bond lengths are 2.14 Å. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-55°. The Si(1)-O(1) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.66 Å. Both Si(1)-O(2) bond lengths are 1.64 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ca(1), two equivalent Mg(1), and one Si(1) atom.