Uses: Rhenium is used in making high-temperature superalloys which are used in a number of applications such as in commercial and military (F-15 and F-16) jet engines and in natural gas turbines used to generate electricity.

Description: Rhenium is one of the rarest elements in the earths crust and has a very high melting point which is why it is used in the production of heat resistant superalloys. It is also one of the most expensive elements trading as high as $11,000/kg in 2008.