There's platinum, but AFAIK they don't have it in Middle-earth, or mithril is a sort of equivalent of it.
So ... how about a metal having one of mithril's qualities ... I think it was (or the metal made from it was) as hard as STEEL.
I wonder if we're looking for a double wall of spears or swords ... in which case it could perhaps be the GLADDEN FIELDS?
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