The fictional metal mined in Moria in J.R.R. Tolkien’s legendarium is mithril.
Mithril is a rare, precious metal associated especially with the Dwarves of Khazad-dûm, the underground realm later known as Moria. Tolkien describes it as lighter than silver but stronger than forged steel, which explains its extraordinary value and its use in armor, weapons, and other objects.
The Fellowship passes through Moria during The Lord of the Rings. There, the discovery of a mithril coat helps reveal what happened to Balin’s expedition. Frodo wears the coat beneath his clothing, and it saves his life when an Orc spear strikes him in the mines.
Mithril is not simply ordinary silver with a fantasy name. In Tolkien’s mythology it has a distinctive origin and exceptional properties. The name is formed from Sindarin elements commonly translated as “grey glitter,” while the metal’s scarcity makes it more valuable than gold in Middle-earth.