Jorium can be safely handled without protection. It resonates at the same frequencies as some brain waves, and may be used to stimulate brain activity and produce psionic abilities in terrans. It also stabilizes terrazine, another psi-enhancing substance, and minimizes its hallucinations and side effects. It is required to create spectres.
Jorium is also used for military and scientific applications, and as such sells for a high price on the terran black market.Abathur found jorium useful for experimentation, as it enhanced the psionic potential of the zerg.
Jorium can interfere with telepathic abilities, causing headaches in terran psychics (non-psychic terrans are apparently unaffected). This is true even at a great distance. The largest stockpile of jorium in the Koprulu sector is located on the planet of Tartarus in the Terran Dominion.
After the End War, jorium came in big demand for the Terran Dominion as well as renegade elements such as the Covert Ops Crew of Nova Terra, and fetched a high price on the black market. A force under Captain Hogarth violated the Dominion/DaelaamDMZ in order to try to steal crates from the planet Adena to sell for themselves. However, they came under attack from the zerg led by rogue BroodmotherNiadra. A team of scavengers, including a telepath named Elms, managed to save a few marines and escape with the jorium. After evading Dominion forces, Elms brought the jorium to the Last Junction to sell to James Sykes. However, Sykes attempted to betray her and steal the jorium for himself, resulting in a shootout between Elms' scavengers and Sykes' mercenaries. After subduing Sykes, Elms realized that the jorium was adversely affecting her telepathic abilities, as she hadn't been able to detect Sykes' true intentions until it was too late.