What is iridum used for?

Answer 1

Iridium is a stable metal that chemically unreactive, like platinum and gold. Iridium is the most resistant to oxidation of all metals. It can be used is as a hardening agent in alloys with Platinum and Osmium . Sometimes used in medical therapies e.g. treating prostate cancer by radiation therapy. Used for crucibles, special containers and other apparatus resistant to intense heat. Alloyed with Platinum to make heavy duty electrical contacts such as high performance technically advanced spark plugs for use in the automotive and aviation industries. Very brittle and extremely difficult to machine but is available as sheet, wire, powder and sponge. As a catalyst to produce organic acids e.g. ethanoic acid Iridiumalloyed with Osmium is used to tip fountain pen nibs and in pivot bearings such as those found in compasses, surgical tools and other special equipment.

Answer 2

cellphone iridum (the station that cellphones connect Like At&At)