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Memory Beta, non-canon Star Trek Wiki
Memory Beta, non-canon Star Trek Wiki
For other uses, see Ro.

Rodinium (symbol Ro, also spelled rhodinium and commonly referred to as cast rodinium in applications) is a chemical element, atomic number 125 on the periodic table.

Characteristics and history[]

Rodinium, in its most stable form, has an atomic mass of 323, and was discovered by Humans and the Federation through the study of the records found on Vega IX in archaeological research. This metal is part of the trans-uranic series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)

Rodinium was of note to Federation science in the 23rd century because of qualities as the hardest known metal when cast for construction purposes. (TOS episode: "Balance of Terror")

As one of the hardest materials known, rodinium was often used in the construction of starships, space stations and other structures, both within the Federation and in the Cardassian Union, such as in the Earth Outpost Stations and the Bok'Nor-class freighters. (TOS episode: "Balance of Terror"; DS9 episode: "The Maquis, Part I"; DS9 novel: Devil in the Sky)

The docking pylons and crossover bridges of Nor-class stations such as Terok Nor/Deep Space 9 were manufactured from 70% rodinium. (DS9 reference: Star Trek: Deep Space Nine Technical Manual)

Rodinium was also used in the Cardassian disruptor as part of a collar that reinforced the emitter crystal. (DS9 reference: Star Trek: Deep Space Nine Technical Manual)

Cast-rodinium was used to form the structure of the Bunker. (TNG novel: Before Dishonor)


The Curved Rodinium Culture was a name given by archaeologists to an Orion Empire that dominated most of the Orion Arm around 23,000 years before modern times. (Last Unicorn RPG module: All Our Yesterdays: The Time Travel Sourcebook)

Historically, this element was discovered by inhabitants of Vega IX, whose achievements were later researched by the Federation. (ST reference: Star Fleet Medical Reference Manual)

In the mid-23rd century, cast rodinium was among the hardest materials known to Federation science. (TOS episode: "Balance of Terror")

During her training in the Obsidian Order, Iliana Ghemor had to quickly assemble a disruptor from a variety of parts given to her. She managed to assemble it, including its rodinium collar, in record time. (DS9 novel: Fearful Symmetry)

Beginning in 2267, one metric ton each of castrodinium and trititanium were provided to Capellans on Capella IV as part of a topaline mining treaty. (ST reference: Federation: The First 150 Years)

Quark thought that doors in the Nagal Residence were made of rodinium. (DS9 novel: The 34th Rule)

In 2374, an explosive device that detonated in Lavin Meryn's establishment on Deep Space 9's Promenade was loaded with rodinium darts for use as shrapnel. (DS9 - Too Long a Sacrifice comic: "Issue 1")

See also[]

  • Rodinium boronate
  • Rodinium dicorferite
  • Rodinium excelinate
  • Rodinium monocrystal
  • Rodinium pentacarbide



In real-life science, element 125 has yet to be discovered. A placeholder name based on its number, "unbipentium", has been suggested to document the possible existence of this substance. Some models of theoretical science have stated that heavy elements on this scale may be impossible to synthesize or reproduce, and cannot exist in nature. Subspace science mentioned in Star Trek may account for the contradiction of this being a natural resource on other worlds.


External link[]