The Hiroshima Atomic Bombing Birthed a Strange, Never-Before-Seen Material, According to a New Study

The devastating blast vaporized buildings, metal, glass, soil and water. When the substances cooled and condensed, the process created spherical glassy grains—and some of them seem to contain a previously unknown metal alloy

Sara Hashemi | Daily Correspondent

August 10, 2026 10:00 a.m.

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On August 6, 1945, the United States dropped an atomic bomb on the Japanese city of Hiroshima, one of the events that led to the end of World War II. The blast was so devastating that its impacts are still being uncovered decades later.

Now, researchers have found that the extreme conditions of the bombing created a complex material that has never been seen before. The findings were published in the journal Science Advances on July 29.

Members of the team previously found tiny glass particles on the sandy beaches of Hiroshima Bay, in the southern part of Japan’s main island. After studying the spheres more closely, the researchers realized that the particles—dubbed hiroshimaite—were fallout debris from the atomic explosion.

It turns out that those bits of glass are even stranger than previously thought. Some of the droplets seem to contain a previously unknown metal mixture, or alloy, made of iron, chromium, nickel, manganese, molybdenum, silicon and aluminum in a unique crystalline structure.

“Even decades later, a grain only a few micrometers across can retain a detailed record of conditions that existed for only fractions of a second,” says study co-author Luca Bindi, an Earth scientist at the University of Florence in Italy, to Mary Randolph at Scientific American. “These particles are not simply melted debris. They are physical archives of the explosion.”

The atomic blast at Hiroshima created a fireball hotter than 12,600 degrees Fahrenheit that vaporized buildings, metal, glass, soil, and water into a turbulent cloud of plasma. As this material condensed, it created grains of hiroshimaite that were micrometers to millimeters in width.

The researchers analyzed 34 of these particles using powerful microscopes and high-energy beams of electrons. A particularly helpful technique they used is called single-crystal X-ray diffraction, which reveals the three-dimensional structure of atoms and molecules in a material.

After all that work, the new alloy was found only in one of the glassy grains, Bindi tells Prachi Patel at Chemical & Engineering News. “So, it appears to be rare.”

This isn’t the first time scientists have found new substances in the aftermath of nuclear conditions. Bindi also recently led a team that found a novel silicon-rich glass with rare forms of metals born from the world’s first nuclear test: the Manhattan Project’s Trinity test in New Mexico on July 16, 1945.

That material, called trinitite, along with the newly reported alloy, suggests “that extreme, rapidly quenched environments can systematically explore unusual regions of structural and chemical phase space,” Bindi tells Gizmodo’s Gayoung Lee. In fact, nuclear detonations create conditions resembling those during planetary collisions, meteor impacts and lightning strikes, the authors write in the study.

What’s more, the discoveries “open up entirely new research directions and deepen our understanding of how materials form and behave,” says Ángelo Oñate Soto, a materials scientist and engineer at the Universidad de Concepción in Chile who wasn’t involved in the research, to C&EN.

The material discovered in Hiroshima is specifically a multicomponent alloy, a mixture of five or more metallic elements with large fractions of each instead of one main metal with tiny amounts of the others. Experts are becoming increasingly interested in multicomponent alloys because they can have combinations of desired properties—including resistance to wear and corrosion, high strength, ability to bend without breaking and good performance at high temperatures—that are harder to achieve in traditional alloys, the authors write in the study.

The Hiroshima alloy is particularly significant because it represents a previously unknown crystal structure in a family of materials that’s widely used in engineering. The new work also provides researchers a framework for finding and designing new alloys.

Together, write the study authors, the findings highlight the value of carefully and ethically studying blast-derived materials.

Bindi “rightly recognizes that if you want to find new materials, they’re going to be in unusual places,” Michael Widom, a physicist at Carnegie Mellon University who wasn’t involved in the study but has worked with Bindi, tells Scientific American.

Sara Hashemi is a science writer and fact-checker currently based in New York City. Her work has appeared in Sierra, The Body, Maisonneuve magazine and more.