Roonstone
this was a variety of extremely rare, infinitely valuable crystal found on the planet Roon. First brought to light by Mungo Baobab, the Roonstones were covered with carvings and glyphs. However, the mining or export of Roonstones by offworld interests was strictly forbidden and punishable by any number of methods, since Roonstones were always retained for the benefit of the Roonan economy.