Kerium was a precious and widely sought after sparkling red mineral that could be found in abundance on the planet New Texas. The discovery of Kerium caused a "Kerium Rush" towards the planet by settlers from Earth and many other planets.
(Kerium is a fluorescent orange crystal more valuable than gold that is often the focus of the conflicts between BraveStarr and Tex Hex.) 
Kerium was mainly used for powering spaceship engines. But many other uses were constantly being developed. Ally Kingston for instance attempted to use liquid Kerium to make blind children see. (Memories)
In Fort Kerium, Kerium was used as a means of currency.
The Fort Kerium bank was constantly in danger of being robbed because of the great amount of Kerium held within. When Dingo Dan terrorized the city in his Dune Buggy, he used a special Kerium magnet to pull the Kerium right out of the bank vault. (Shake Hands with Long Arm John)
There are different types of Edit
- X-Kerium: The most powerful known form of Kerium, a single chunk of which can power all of Fort Kerium for over a year. Yucky Gulch is the best place on New Texas to acquire X-Kerium. (An Older Hand)
- Diamond Kerium
- Episode 02: Memories
- Episode 05: Kerium Fever -
- Episode 07: No Drums, No Trumpets (mentioned only) - BraveStarr mentioned Molly bringing a Kerium shipment into Fort Kerium.
- Episode 54: Shake Hands with Long Arm John - The Stratostage was attacked because it carried a load of Diamond Kerium. Dingo Dan used a Kerium-Magnet to pull giant stacks of Kerium straight out of the Fort Kerium bank. The same magnet was used to attract kerium belonging to settlers and miners to it.
- Episode 56: The Price - Dealer charged three Kerium nuggets for one hit of Spin. Jay stole this amount from his mother's purse for one hit, and was given another three by his friend Daisy.
- Episode 65: Strength of the Bear - (mentioned only) Tex Hex is said to be on the other side of the planet checking out a new Kerium discovery.