Tinclavic

Tinclavic was a malleable mineral mined on the planet Raaga. It was primarily used by the Hakolian who used Terileptil prisoners to mine the mineral. (TV: The Visitation)

Tinclavic was also used in the construction of several spacecraft including the I's spacecraft and the Time Lords' Time Station (in which triple-bonded Polysium was also used). (PROSE: Seeing I, AUDIO: Neverland)