I have compiled a list of sources for the elements that are available to the amateur chemist. Ruthenium will be discussed here.
Ruthenium is one of the lightest of the platinum group metals. Situated right under iron on the periodic table, ruthenium is a silvery gray hard metal. Like most of its neighbors, ruthenium is rather inert to attack by acids at room temperature. Actually, bleach will dissolve ruthenium while the most corrosive acids leave it untouched. From 2 to 11% of PGM ores consist of ruthenium. Ruthenium is one of the few elements that can form an octavalent oxidation state.
In element form: Ruthenium plating is used when a rather dark coating is desired. Electrical contacts are occasionally plated with ruthenium. Some tips of antique fountain pens contain a ruthenium alloy.
In compound form: Thick filim resistors commonly contain ruthenium dioxide.
Here is my sample of ruthenium. It is some thick film resistors from a circuit board.