Parrinium

Parrinium is a rare element found only on the planet Exxilon. When a Space plague swept the Galaxy the cure it was proven Parrinium was the cure for it. A Human taskforce was sent to Exxilon to mine Parrinium and bring it back to cure the Galaxy. A Dalek taskforce also went to Exxilon to obtain the ore but only so they could blackmail the galaxy into submission. The Daleks enslaved the native Exxilons and forced them to mine the Parrinium for them. They secretly tricked the Daleks by loading there ship with sand instead of Parrinium. The Exxilons use Parrinium as a Table salt. (DW: Death to the Daleks)