![]() These examples are programmatically compiled from various online sources to illustrate current usage of the word 'iridium.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Breanna Draxler, Discover Magazine, 1 July 2013 See More Corinne Purtill, Los Angeles Times, Researchers determined the samples to be 99.5 percent carbon with inclusions of other trace elements such as troilite and iridium. But here’s the twist iridium isn’t your everyday superstar. Iridium is one of the least abundant elements in the. 2021 Dunn and Currano spent a month in the field looking for rocks bearing the telltale stripe of iridium deposits the asteroid strike left on Earth. It is the most corrosion-resistant metal, even at high temperatures. Cody Cottier, Discover Magazine, 7 Apr. 2017 Across the globe, a thin layer of iridium - a chemical element that’s rare on Earth but common in extraterrestrial objects - entombs the dinosaurs like a coffin lid. Mika McKinnon, Discover Magazine, 14 Sep. , 5 July 2023 The last fragments to survive will be its plutonium power supplies, still wrapped in the iridium and shielding meant to reduce risk to Earth during its launch nearly two decades ago. 2023 Supplies of copper, lithium, cobalt, iridium, and tin also may be crimped. Laxmi Corp, The Salt Lake Tribune, 11 Sep. 2023 Platinum is part of the six platinum-group metals (PGM), including palladium, iridium, rhodium, ruthenium, and osmium. 2023 Triplet sensitizers typically contain a heavy metal like palladium, iridium, or platinum. Indium metal is unaffected by air at ordinary temperatures, but at a red heat it burns with a blue-violet flame to form the yellow oxide In 2 O 3.This oxide is easily reduced to the metal, and on strong heating it loses oxygen to give the monoxide, In 2 O, where indium is in the +1 oxidation state.Indium hydroxide dissolves in both acids and alkalies. ![]() These metals are different from Rare Earth Elements, which aren’t actually rare in terms of abundance, but are rarely found in concentrated ore deposits. ![]() The opposite of a noble metal is a base metal. This excludes copper, but adds in other platinum group metals, such as rhodium, palladium, ruthenium, osmium, and iridium. Another definition of a noble metal is one which resists oxidation and corrosion. Recent Examples on the Web PGMs are critical to the energy transition and demand for platinum and iridium are forecast to rise sharply, as both are used to make electrolyzers, a critical technology for producing low-emission hydrogen. In terms of abundance in the Earth’s crust, the rarest metals are: gold, platinum, osmium, iridium, palladium, ruthenium, rhodium, tellurium and rhenium. According to this definition, gold, silver, and copper are noble metals.
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