Titanium is perhaps the most exotic and expensive metal commonly used for bicycle frame tubes.

Taken together, just those five asteroids would produce enough exotic metal and raw material to supply global demand for another twenty years.

A better Idea is to use exotic metals like uranium and thorium directly - in a nuclear power station.

The huge bulk of exotic metal buffeted the air.

Rarely, machinists also work with exotic and refractory metals.

The term exotic metals is a general term describing out of the ordinary, rare or special purpose metals.

"You think it's made of some exotic metal?"

Platinum was considered, if at all, as an exotic metal.

What about their interest in exotic metals?

Such exotic metals as titanium were considered before the Mint decided on the standard clad composition.