Trisilicate

Trisilicate was a valuable mineral ore found in quantity on Peladon. Much of the technology of the Galactic Federation is based on it.

When the Federation went to war with Galaxy 5, the use and control of the trisilicate supply became vital to their war effort. The mining and refinement of the ore was threatened by a workers' rebellion against the rulers of Peladon and the Federation. The traitor Eckersley, with the help of renegade Ice Warriors, planned to ship the ore to Galaxy 5, but they were thwarted by the Third Doctor. (DW: The Monster of Peladon)

By 3985 the trisilicate deposits were almost totally mined out. (NA: Legacy)

Behind the scenes

 * Barry Letts took the name "Trisilicate" from a list of ingredients on the back of a tube of Boots brand tothpaste.