Iridium is a metal. Iridium is a rare metal, and is therefore expensive. It is known as a "noble metal". Iridium belongs to a group of metals known as transition metals. It looks like platinum and is found in asteroids and comets. Iridium deposits are used to identify relative dates of collisions of foreign bodies.. Iridium is a very costly metal that can fold and bend just like aluminum, and remains very shiny. It is relatively rare on the Earth's crust. Most iridium is found in the Americas, though some is found in Myanmar, South Africa, and Russia.Iridium is the most corrosion resistant metal, melts at 2410 °C, and boils at 4130 °C.
Iridium is not needed in the body.
A man named Smithson Tennant first found it in the year 1803. Smithson Tennant found it in the remains when he left crude platinum in a mixture of hydrochloric acid and nitric acid.