Some of the most coveted metals on the planet are not just expensive, they are almost unimaginably scarce in Earth's crust ...

The world’s most expensive substances command their prices for very different reasons. Some, like rare gemstones, are ...

The group of rare earth elements (REEs) comprises a total of 17 elements, all of which possess similar chemical properties. In addition to the two lightest elements, scandium and yttrium, the group ...