Tensilite

Tensilite (from Old Basic tensilis, meaning "very strong") was an extremely durable metal that could withstand unnatural amounts of pressure, heat, and kinetic energy. Discovered in around 6000 BBY, tensilite's first known use was in the construction of Castrum Amplus (the "Ample Castle"), which served as the command center of the Coruscanti army for several millennia until it was deconstructed sometime around the New Sith Wars. As the material was too heavy to use in vehicle and armor construction, it was limited to architecture. On some worlds, tensilite was used to create tethers used in the construction in space elevators, such as those on Quarzite. Many of Coruscant's tallest buildings used tensilite bases as foundation and skeletal structure, allowing some skyscrapers to stand several kilometers tall.