NaMgFe(SO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(3) atoms. Mg(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form MgO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. Fe(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form FeO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-40°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Mg(1), and one S(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(2), one Fe(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mg(1) and one S(1) atom.
NaMgFe(SO4)3 crystallizes in the trigonal R-3 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. All Na(1)-O(2) bond lengths are 2.45 Å. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to six equivalent O(3) atoms. All Na(2)-O(3) bond lengths are 2.56 Å. Mg(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form MgO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. All Mg(1)-O(2) bond lengths are 2.09 Å. All Mg(1)-O(4) bond lengths are 2.04 Å. Fe(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form FeO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra. All Fe(1)-O(1) bond lengths are 1.99 Å. All Fe(1)-O(3) bond lengths are 2.07 Å. S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-40°. The S(1)-O(1) bond length is 1.50 Å. The S(1)-O(2) bond length is 1.47 Å. The S(1)-O(3) bond length is 1.51 Å. The S(1)-O(4) bond length is 1.46 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(1) and one S(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Mg(1), and one S(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(2), one Fe(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mg(1) and one S(1) atom.