Scabrite

"As I shatter Twilight, Mjølnir takes the power of Scabrite as it's own!"

- Thor

Scabrite was a god-like metal, which could only be found in the mines of Muspelheim. Surtur, Muspelheim's ruler, used this metal to create his sword, Twilight.

After Thor defeated Surtur and destroyed Twilight, his hammer Mjølnir absorbed the power of Scabrite.