atomic number 77, a hard, dense silvery-white metal.
Iridium is widely used to harden platinum, make devices requiring high temperatures, and in electrical contacts. It’s also used incoating optical lenses to reduce glare and enhance clarity. Osmiridium, a combination of the elements osmium and iridium, is used for fountain pens and compass bearings.
sources of iridium
Native platinum has many of the platinum group of metals, including iridium. Iridium is commercially recovered as a by product in nickel mining. The element is named iridium for its colored salts.