Iridium is the most corrosion-resistant metal known: it is not attacked by almost any acid, aqua regia, molten metals, or silicates at high temperatures. Some ambiguity occurred regarding which of the two elements was denser, due to the small size of the difference in density and difficulties in measuring it accurately, but, with increased accuracy in factors used for calculating density, X-ray crystallographic data yielded densities of 22.56В g/cm 3 (0.815В lb/cuВ in) for iridium and 22.59В g/cm 3 (0.816В lb/cuВ in) for osmium. The measured density of iridium is only slightly lower (by about 0.12%) than that of osmium, the densest metal known. Despite these limitations and iridium's high cost, a number of applications have developed where mechanical strength is an essential factor in some of the extremely severe conditions encountered in modern technology. This, together with a high shear modulus and a very low figure for Poisson's ratio (the relationship of longitudinal to lateral strain), indicate the high degree of stiffness and resistance to deformation that have rendered its fabrication into useful components a matter of great difficulty. Iridium's modulus of elasticity is the second-highest among the metals, being surpassed only by osmium. It has the 10th highest boiling point among all elements and becomes a superconductor at temperatures below 0.14 K (в€’273.010В вЊ в€’459.418В вЏ). It is the only metal to maintain good mechanical properties in air at temperatures above 1,600В вЊ (2,910В вЏ). Because of its hardness, brittleness, and very high melting point, solid iridium is difficult to machine, form, or work thus powder metallurgy is commonly employed instead. One troy ounce (31.1035 grams) of arc-melted iridiumДЄ member of the platinum group metals, iridium is white, resembling platinum, but with a slight yellowish cast.

It is thought that the total amount of iridium in the planet Earth is much higher than that observed in crustal rocks, but as with other platinum-group metals, the high density and tendency of iridium to bond with iron caused most iridium to descend below the crust when the planet was young and still molten. Similarly, an iridium anomaly in core samples from the Pacific Ocean suggested the Eltanin impact of about 2.5В million years ago.

For this reason, the unusually high abundance of iridium in the clay layer at the CretaceousвЂ“Paleogene boundary gave rise to the Alvarez hypothesis that the impact of a massive extraterrestrial object caused the extinction of dinosaurs and many other species 66В million years ago, now known to be produced by the impact that formed the Chicxulub crater. Iridium is found in meteorites in much higher abundance than in the Earth's crust. Iridium radioisotopes are used in some radioisotope thermoelectric generators. Iridium metal is employed when high corrosion resistance at high temperatures is needed, as in high-performance spark plugs, crucibles for recrystallization of semiconductors at high temperatures, and electrodes for the production of chlorine in the chloralkali process. The most important iridium compounds in use are the salts and acids it forms with chlorine, though iridium also forms a number of organometallic compounds used in industrial catalysis, and in research. 191Ir and 193Ir are the only two naturally occurring isotopes of iridium, as well as the only stable isotopes the latter is the more abundant. Iridium is one of the rarest elements in Earth's crust, with annual production and consumption of only 3 tonnes (6.6В thousand pounds). Smithson Tennant, the primary discoverer, named it after the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium was discovered in 1803 among insoluble impurities in natural platinum. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable. It is the most corrosion-resistant metal, even at temperatures as high as 2,000В вЊ (3,630В вЏ). A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56В g/cm 3 (0.815В lb/cuВ in) as defined by experimental X-ray crystallography. Iridium is a chemical element with the symbol Ir and atomic number 77.

Iridium melting point