CaMgAsO4F crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 7-coordinate geometry to two equivalent O(1), four equivalent O(2), and one F(1) atom. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(1) atoms to form MgO4F2 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. As(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with four equivalent Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Mg(1), and one As(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mg(1), and one As(1) atom. F(1) is bonded in a trigonal planar geometry to one Ca(1) and two equivalent Mg(1) atoms.
CaMgAsO4F crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 7-coordinate geometry to two equivalent O(1), four equivalent O(2), and one F(1) atom. Both Ca(1)-O(1) bond lengths are 2.47 Å. There are two shorter (2.45 Å) and two longer (2.68 Å) Ca(1)-O(2) bond lengths. The Ca(1)-F(1) bond length is 2.26 Å. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent F(1) atoms to form MgO4F2 octahedra that share corners with two equivalent Mg(1)O4F2 octahedra and corners with four equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. Both Mg(1)-O(1) bond lengths are 2.10 Å. Both Mg(1)-O(2) bond lengths are 2.14 Å. Both Mg(1)-F(1) bond lengths are 1.95 Å. As(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with four equivalent Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. Both As(1)-O(1) bond lengths are 1.72 Å. Both As(1)-O(2) bond lengths are 1.73 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Mg(1), and one As(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mg(1), and one As(1) atom. F(1) is bonded in a trigonal planar geometry to one Ca(1) and two equivalent Mg(1) atoms.