K2SiF6 crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, and faces with four equivalent Si(1)F6 octahedra. Si(1) is bonded to six equivalent F(1) atoms to form SiF6 octahedra that share faces with eight equivalent K(1)F12 cuboctahedra. F(1) is bonded in a single-bond geometry to four equivalent K(1) and one Si(1) atom.
K2SiF6 crystallizes in the cubic Fm-3m space group. K(1) is bonded to twelve equivalent F(1) atoms to form KF12 cuboctahedra that share corners with twelve equivalent K(1)F12 cuboctahedra, faces with six equivalent K(1)F12 cuboctahedra, and faces with four equivalent Si(1)F6 octahedra. All K(1)-F(1) bond lengths are 2.84 Å. Si(1) is bonded to six equivalent F(1) atoms to form SiF6 octahedra that share faces with eight equivalent K(1)F12 cuboctahedra. All Si(1)-F(1) bond lengths are 1.70 Å. F(1) is bonded in a single-bond geometry to four equivalent K(1) and one Si(1) atom.