he long range polyhedral connectivity of rutile can be visualized as chains of edge sharing TiO6 octahedra running parallel to the c-direction, as shown in the diagram on the upper right. These chains share corners with each other as shown in the diagram on the lower left. The rutile structure is observed primarily for oxides and fluorides. Metal-metal bonding (either localized or delocalized metallic) is often seen when the cation posesses a partially filled d subshell, such as MoO2.