Realms of Ama'Glen
Mithral is a strong, lustrous, corrosion-resistant metal with a silver color. Mithral can be alloyed with iron or other metals to produce strong lightweight alloys. The two most useful properties of the metal form are corrosion resistance and the highest strength-to-weight ratio of any metal. In its unalloyed condition, mithral is as strong as some steels, but 45% lighter.
Although sometimes used to create jewelery, mithral is primarily sought after for use in armor due to its high strength-to-weight ratio.