[Source] Tunqstoid was an incredibly heavy substance used to make blast doors during the reign of the Galactic Federation of Free Alliances. Galactic Alliance Security Detention Center 81, a security blockhouse on the planet Coruscant had blast doors made from tunqstoid, which were so heavy they required mag-lev guides instead of tracks. When the Jedi Knight Jaina Solo saw the doors she decided to take an alternate route to getting into the block house and freeing the Jedi frozen in carbonite trapped within.