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Neutronium was a dense alloy made up of non-toxic, trans-uranic elements on the periodic table that had far more neutrons than protons or electrons and it was difficult to produce. Groups and races who have managed to manufacture and use it include the Dominion, the Iconians and the Vidiians.

It was a super-dense element that was found at the heart of a collapsed star, which made it a rare but extremely tough substance. As armor, it was resistant to almost any form of energy and matter. This made it impervious to all known forms of contemporary weapons. (FASA RPG module: A Doomsday Like Any Other)

Atomically pure neutronium was valuable and usually quite easy to sell. (FASA RPG module: The Orions: Book of Common Knowledge)


Neutronium was used in the hull of the Planet Killer. (TOS episode: "The Doomsday Machine", TNG novel: Before Dishonor)

A ziggurat on Vandros IV in which the Iconians kept a gateway was made of neutronium. In 2372, this forced the crew of the USS Defiant and Weyoun's Jem'Hadar soldiers to mount a ground offensive against the rebel Jem'Hadar on Vandros. (DS9 episode: "To the Death")

The Dyson sphere found by the USS Enterprise crew in 2369 was constructed with neutronium. (TNG episode: "Relics", TNG novel: Dyson Sphere)

A particular Vulcan ship visiting the trading planet of Rigel IV was unable to sell its pure neutronium, and only made a profit after selling every single soft drink on board. (FASA RPG module: The Orions: Book of Common Knowledge)

The Dominion used neutronium in the cargo bay door of its headquarters on Cardassia. (DS9 episode: "What You Leave Behind")

The Think Tank's ship had a neutronium hull. (VOY episode: "Think Tank")

By the 31st century Starfleet used neutronium alloys for the hulls of some of their vessels. (DSC episode: "Die Trying")

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