Mythril is NOT silver. It is, as most everyone likely knows, a reference to Tolkien's works, wherein there is a mineral known as Mithril, from the Elvish meaning "grey gleam" (see the word "Mith" in Mithrandir, Grey Wanderer, Mithlond, the Grey Havens, and "ril" in Anduril.) Anyway, this is not silver. It is called "True-Silver"; look at its description: it shines like common silver, but the Dwarves can make of it a very strong metal. I cannot quite remember the exact eloquent description that Tolkien uses, but personally, I think it might actually be titanium. Silver is not near so strong as Mithril is made out to be, but titanium is. Sure, it's not quite as shiny... but maybe an alloy? Likely there is not full true equivalent, but it is nearer titanium than silver, at any rate.