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A more convenient approach was used for the international prototype metre of 1870, a bar of platinum-iridium alloy which served as the definition of the meter from 1889 to 1960.
en.wikipedia.org The province has significant deposits of antimony, chromium, coal, cobalt, copper, fluorite, gypsum, iridium, iron, lead, limestone, mercury, mirabilite, nickel, crude oil, platinum, troilite, tungsten, and zinc among others.
en.wikipedia.org Many metrologists accustomed to venerating the platinum-iridium cylinder are wary of change.
www.wired.com Naturally occurring iridium alloys include osmiridium and iridosmine, both of which are mixtures of iridium and osmium.
en.wikipedia.org The most common energy source used is radiofrequency energy delivered through the platinum-iridium tip of an ablation catheter.
jama.jamanetwork.com