I have compiled a list of sources for the elements that are available to the amateur chemist. Scandium will be discussed here.
Scandium is a slightly yellowish silvery metal. When alloyed with aluminium it makes aluminium very strong. Scandium is rare as an element and very expensive. It was used by the Russians in military aircraft. Scandium does not have very interesting chemistry.
In element form: Some bicycle frames and other expensive metal objects are made of scandium-aluminium alloy, which contains from 0.1-0.5% of scandium metal.
In compound form: Scandium iodide is used in metal halide lamps.