K3MgVO4 crystallizes in the orthorhombic I222 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(1) atoms to form distorted KO4 tetrahedra that share corners with four equivalent K(1)O4 tetrahedra and corners with four equivalent V(1)O4 tetrahedra. In the second K site, K(2) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. V(1) is bonded to four equivalent O(1) atoms to form distorted VO4 tetrahedra that share corners with eight equivalent K(1)O4 tetrahedra. O(1) is bonded to one K(2), two equivalent K(1), one Mg(1), and one V(1) atom to form a mixture of distorted corner and edge-sharing OK3MgV trigonal bipyramids.
K3MgVO4 crystallizes in the orthorhombic I222 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent O(1) atoms to form distorted KO4 tetrahedra that share corners with four equivalent K(1)O4 tetrahedra and corners with four equivalent V(1)O4 tetrahedra. All K(1)-O(1) bond lengths are 2.78 Å. In the second K site, K(2) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All K(2)-O(1) bond lengths are 2.66 Å. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 1.98 Å. V(1) is bonded to four equivalent O(1) atoms to form distorted VO4 tetrahedra that share corners with eight equivalent K(1)O4 tetrahedra. All V(1)-O(1) bond lengths are 1.96 Å. O(1) is bonded to one K(2), two equivalent K(1), one Mg(1), and one V(1) atom to form a mixture of distorted corner and edge-sharing OK3MgV trigonal bipyramids.