Shockley
Maester
You could go old-school fantastic metals - orichalc/orichalcum. It basically means 'mountain copper' and was probably a kind of copper that was particularly bright (or yellowish), but was associated with the Atlanteans for its strength and durability.
Or you could make up something, like faerie-silver (I like that) or glowcopper or somesuch.
Or you could make up something, like faerie-silver (I like that) or glowcopper or somesuch.