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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.
Iridium is very hard and brittle and hardens other metals it is alloyed with, especially platinum. These alloys are used in spark plugs, electrical contacts, and high temperature crucibles. Biological Rating: No known benefits for life processes in plants or animals.btained From: Iridium is found in its pure native form and in osmiridium, a natural alloy of iridium and osmium. Iridium is mined from sulfide layers in mafic igneous rocks where it is present with other platinum-group elements.