Chernobylite

Chernobylite is a technogenic compound, a crystalline zirconium silicate with a high (up to 10%) content of uranium as a solid solution.

It was discovered in the corium produced in the Chernobyl disaster, a lava-like glassy material formed in the nuclear meltdown of reactor core 4. Chernobylite is highly radioactive due to its high uranium content and contamination by fission products.