Kerium is a fluorescent, slightly glowing, reddish-orage crystalline mineral that is renewable. Kerium is fairly rare across the Galaxy, and is extremely valuable given its rarity and importance.
Kerium is one of the most powerful, safest and most reliable fuels for interstellar travel. Kerium also has extremely potent medical properties, but medical research into kerium is in its infancy given the scarcity and value of the mineral.
Large deposits of kerium have been found on the planet of New Texas. The discovery of an abundance of kerium caused a "Kerium Rush" towards the planet by settlers from Earth and many other planets. Given that it the mineral is more valuable than gold - and also given that anyone who could control kerium it in its entirety could in theory control the Galaxy - that kerium often the focus of the conflicts between BraveStarr and Tex Hex.
The main human settlement on New Texas is Fort Kerium, named after the mineral mine there.
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. (Eye of the Beholder)
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)
- 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 01: Tunnel of Terror
- 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 10: Eye of the Beholder - 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.
- Episode 14: Sherlock Holmes in the 23rd Century - Part 1
- Episode 16: Hail, Hail, The Gang's All Here
- Episode 22: The Witnesses
- Episode 23: The Wrong Hands
- Episode 26: Jeremiah and the Prairie People
- Episode 28: An Older Hand
- Episode 36: Nomad is an Island
- Episode 38: Buddy
- Episode 44: Tex's Terrible Night
- Episode 45: Revolt of the Prairie People
- Episode 46: A Day in the Life of a New Texas Judge
- Episode 52: Brothers in Crime
- 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 49: Call to Arms - Klawtu demands three tons of Kerium in exchange for Shaman's life.
- Episode 60: Sunrise, Sunset
- Episode 61: Legend of a Pretty Lady - a sample of purified Kerium which was stolen from the Fort Kerium hospital by Zlarb was used as avidence during Zlarb's trial. It began to glow because of an Ion Storm raging outside, and when Judge J.B. picked up the sample, the kerium was hit by lightning and accidentally transported J.B. back into the ancient past.
- Episode 64: Thirty/Thirty Goes Camping
- 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.