Graphene could one day be involved in a new definition of the kilogram. To the left of gold in the periodic table are two elements — platinum and iridium — that are just as interesting in many ...

They accidentally discovered a band of sedimentary rock that contained unusually high levels of a rare element, iridium. Chemical dating techniques put the rock at around 65 million years old.

The sustainable chemistry start-up Mattiq will work with the materials supplier Heraeus Precious Metals to develop electrocatalysts that use less iridium than conventional catalysts. Iridium is a ...