I have compiled a list of sources for the elements that are available to the amateur chemist. Samarium will be discussed here.
Samarium is a rare earth metal that is more corrosion resistant than some of the earlier lanthanides. It is a divalent state, which compounds are strong reducing agents. Samarium(II) iodide is a greenish solid, while most of the trivalent compounds are yellowish or greenish as well. Samarium-cobalt magnets are the second strongest magnets, just behind NdFeB. They have a much greater heat resistance than the neodymium magnets. I tried to extract a pure sample of samarium chloride by dissolving the magnet in acetic acid, but some iron dissolved alongside the rare earths, contaminating the solution.
In element form: Samarium-cobalt magnets contain about 15% samarium metal. Mischmetal or ferrocerium contains about 1% samarium.
In compound form: No sources found.
Here is my sample of samarium metal. It is a complete samarium-cobalt magnet removed from a speaker. The shiny nickel plating is torn off in some areas, exposing the magnetic samarium-cobalt-misc. alloy.