Diburnite was a material used for construction.

It was commonly used by the Orions of Rigel VII for the construction of their fortifications. The diburnite towers of the ruined city of Kolaripam still stood after millennia, while Vajripam was known for its diburnite citadels, and the vazaks of the Vaj had diburnite fortresses. (Decipher RPG module: Worlds)

By its name, diburnite is likely a mineral of the element diburnium.
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