Rudic
this crystalline mineral is a prime component in the manufacture of sensor devices. Rudic was once found in abundance on the planet Hirsi, and the native Qwohog allowed the Alliance to establish a base there to mine it. When the Empire caught wind of the availability of rudic on Hirsi, it invaded the planet, killed the Alliance team, and stripped Hirsi of a large percentage of rudic. They then left the planet in a ruined state when the rudic ran out. Since then, the only rudic found on Hirsi is small, water-borne pieces given to the Alliance and, later, the New Republic.