Iridium is a transition metal that is part of the platinum group of elements. It has a number of unique properties, including its exceptional hardness, high melting point, and remarkable resistance to corrosion and oxidation. Its resistance to corrosion has led to its use in a variety of applications, including electronics, spark plugs, and crucibles for materials that require high-temperature processing. In addition to these applications, iridium is also used in the manufacturing of various alloys, as well as in the production of certain chemicals. Its rarity and unique properties have also made it valuable in jewelry making, where it is often used in combination with other precious metals.