Doonium
a heavy metal used by the Empire in most of the construction of its war machines, doonium was mined from asteroids and other small planetoids by a variety of corporations. During the last decades of the Old Republic, the planet Atraken was also a source, but the ravages of the Clone Wars precluded any form of mining operation there. The mining and export of doonium was carefully monitored by the Mining Guild, due to the metal's value throughout the galaxy. During the construction of the second Death Star, the Empire mined huge amounts of doonium from the planetoid Dor.
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