- Zynothium?!? You powered that suit with ZYNOTHIUM?!? Are you crazy, man? That stuff is dangerous! And unstable! Tell me you were not stupid enough to go messing with it!!
- ―Cyborg, about the properties of Zynothium[src]
Zynothium (pronounced zi-no-thee-um), also known as Zynothium ore, is a fictional chemical compound, used for its molecular properties as a super power supply.
Zynothium is an extremely rare and dangerous compound, so dangerous that even reputable members of the superhuman community like Robin are unable to buy it legally. It is very unstable and thus quite volatile, but this instability makes it highly suitable as a high-output power source. However, Zynothium appears to not be radioactive, since several characters were seen handling it without the protection of a radiation suit. This suggests that the Zynothium's molecular structure gradually breaks down, releasing energy, in a process similar to radioactive decay, though more in a chemical rather than energetic way. Still, Xenothium is considered an extremely hazardous material; the only safe way to dispose of it apppears to let it decay naturally.