iridium -
A metallic chemical element symbol Ir with an atomic number of 77.
Wikipedia
Iridium is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second densest element and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.
OmegaWiki Dictionary
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iridium Chemical element with symbol Ir and atomic number 77, silvery white transition metal.
