Quantanium

Quantanium is tiny, delicate, highly unstable mineral that can be harvested and refined into quantum fuel. Once mined, Quantanium degrades over time and 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. Failing to eject risks ship damage and destruction. Given the risk, successful delivery of quantainium will be a lucrative endeavor.