Red Mercury/Ella Littwitz

Although no evidence of its existence has been found, red mercury has been attributed properties related to the production of nuclear weapons, ballistic missile guidance, and radar camouflage. 

Despite the truth of the material is doubtful, it is traded on the black market, meaning it has economic, and thus also real value.

Ella Littwitz, Red Mercury, 2021

Rust from water where two states did not want to impose sovereignty

Rust from water where two states demand sovereignty

Rust from water from a buffer zone

Rust from ex-territorial waters