I always figured it was directly chiseled from the mountain. But perhaps it's
made of a superior Dwarven alloy of mithril and stone.
Or maybe *that's* what they did with all those tailings...melted and fused them
into a span of incalculable strength. No wonder Gandalf's staff
broke.
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"In that hour I looked on Aragorn and thought how great and terrible a Lord he might have become in the strength of his will, had he taken the Ring to himself. Not for naught does Mordor fear him."