Unstable mineral used to produce quantum fuel
Quantanium is a tiny, delicate, highly unstable mineral that can be harvested and refined into quantum fuel[1]. Once mined, Quantanium degrades over time.
Impacts to the transporting ship will also accelerate this degradation.
Once it degrades to a certain extent it, will be in danger of exploding, giving the pilot a visual/audio warning and the option to eject all cargo via a button on the cockpit. Failing to eject in time will most often result in an explosion and death of the carrier.
Given the risk, successful delivery of Quantanium is a lucrative endeavor and should only be attempted with practice in mining.