Hiroshima atomic bomb yields previously unknown multicomponent alloy

Researchers have identified a previously unknown metal alloy formed by the fireball of the 1945 Hiroshima atomic bomb. Analysis of glassy debris particles, known as hiroshimaites, revealed a complex crystal structure containing iron, chromium, silicon, nickel, manganese, molybdenum and aluminum. The alloy is thought to have condensed when the bomb’s fireball, exceeding 7,000 °C, vaporized urban materials and industrial metals, creating a plasma that rapidly cooled and mixed elements that would never combine under normal conditions. The study was led by mineralogist Luca Bindi of the University of Florence, building on earlier sampling by geologist Mario Wanie on Ujina Island. Findings were published in Science Advances and expand the known spectrum of materials generated by nuclear detonations, offering a natural laboratory for rapid alloy nucleation.

The discovery underscores the extreme physical processes of nuclear explosions and provides new insight into the long‑term chemical legacy of the Hiroshima blast.