Jacenite
From Tardis Wiki, the free Doctor Who reference
Jacenite was a type of rock which carried a powerful electromagnetic charge. Sezom had been experimenting with its use for several years and eventually used it to modify the staff the Nimons had given him so that it would damage them. (TV: The Horns of Nimon [+]Loading...["The Horns of Nimon (TV story)"])
