Idursaglase

Idursaglase is a fictional material from J.R.R. Tolkien's Middle-earth legendarium, first introduced in "The Silmarillion." It is a type of glass that is incredibly strong and durable, capable of withstanding immense heat and pressure. Idursaglase is often used in the construction of various objects, particularly those that require exceptional strength and resistance to damage.

The material is created through a process that involves the melting of certain minerals and metals, followed by a cooling process that allows the glass to solidify into a highly resilient form. This process is meticulously controlled to ensure the glass's strength and durability.

Idursaglase is notably used in the construction of the Silmarils, the Three Rings of the Elves, and the Palantíri, the Seeing-Stones of the Istari. Its strength and durability make it an invaluable resource in the crafting of these powerful and enduring artifacts.

The exact composition of Idursaglase is not fully detailed in Tolkien's works, but it is implied to be a highly specialized and rare material, reflecting the advanced craftsmanship and knowledge of the Elves and other skilled artisans in Middle-earth.