CaMgAsO4F crystallizes in the monoclinic Cc space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), two equivalent O(2), two equivalent O(3), and one F(1) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), 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 one O(1), one O(2), one O(3), and one O(4) atom 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 four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped 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. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mg(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one 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 Cc space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), two equivalent O(2), two equivalent O(3), and one F(1) atom. The Ca(1)-O(1) bond length is 2.45 Å. The Ca(1)-O(4) bond length is 2.48 Å. There is one shorter (2.45 Å) and one longer (2.73 Å) Ca(1)-O(2) bond length. There is one shorter (2.44 Å) and one longer (2.64 Å) Ca(1)-O(3) bond length. The Ca(1)-F(1) bond length is 2.27 Å. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), 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°. The Mg(1)-O(1) bond length is 2.10 Å. The Mg(1)-O(2) bond length is 2.13 Å. The Mg(1)-O(3) bond length is 2.15 Å. The Mg(1)-O(4) bond length is 2.10 Å. Both Mg(1)-F(1) bond lengths are 1.95 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 Mg(1)O4F2 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. The As(1)-O(1) bond length is 1.72 Å. The As(1)-O(2) bond length is 1.73 Å. The As(1)-O(3) bond length is 1.73 Å. The As(1)-O(4) bond length is 1.72 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped 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. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Mg(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one 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.