Durnor gems can be crafted into Durnor Blocks for storage.
Durnor has a number of uses in crafting. On the Morgul crafting table, it can be used to make Orc torches, which can be used as a light source by Mordor players or as a means of igniting Orc bombs. On the Rhûnic crafting table, Durnor is used to make Rhûnic Fire-pots and Khamûl's Fire, highly destructive weapons used by the Easterlings of Rhúdel. Both items are a combination of Durnor, Gunpowder, and Gilded Iron ingots. On the vanilla crafting table, nine Durnor gems can be crafted into a Durnor block, which can be used for (faint) lighting or storage.
Durnor blocks and gems can be used as fuel in any type of forge. A gem can smelt 3 items per slot, whereas a block processes 30 items per slot. In the Orc Forge, Durnor can be alloyed with Orc Steel or Morgul Iron to create Black Uruk Steel, a durable material that can be used to make high-quality gear, making it a very valuable resource for evil players.
Origin of the name
Although Durnor is a non-canon addition and does not appear in Tolkien's work, the name is in Sindarin, one of the Elvish languages. Dur means "dark" in Sindarin, and nor is a variation of naur (meaning "fire"). The end result is Durnor, which stands for "dark fire", due to the red-orange colour of the gems and the dark land where it is found.
Prior to Public Beta 30 it was called "Naurite".