Potassium

Potassium was a substance. Several compounds of potassium existed, including radioactive salts. An overdose of the substance was fatal.

Potassium decayed, and this decay, when occuring within a planet, heated the rock of the planet's crust.

Appearances

 * Dark Forces: Soldier for the Empire
 * "Goatgrass: The Tale of Ree-Yees"
 * "Do No Harm"
 * Balance Point