Iridium is used Helicopter spark plugs.
Standard State: solid at 298 K
Color: silvery white
Iridium was discovered by Tennant in 1803 in the residue left when crude platinum is
dissolved by aqua regia. Iridium, a metal of the platinum family, is white, similar to platinum, but with a
slight yellowish cast. It is very and brittle, making it hard to machine or work
with. It is recovered as a by-product from the nickel mining industry. Iridium is
also used for electrical contacts. Its principal use as a hardening agent for