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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.
Platinumâiridium, alloy of platinum containing from 1 to 30 percent iridium, used for jewelry and surgical pins. A readily worked alloy, platinumâiridium is much harder, stiffer, and more resistant to chemicals than pure platinum, which is relatively soft. 1  Platinumâiridium is also very resistant to high-temperature electric sparks and is widely used for electrical contacts and sparking points.