Aluminum used to be one of the most precious metals in our world, too -- even just a hundred years ago, it was worth more than gold.  Thanks to modern refining technology, however, aluminum has become essentially abundant and cheap.  Most of our ancestors would have been flabbergasted to hear about "aluminum foil," or soda pop cans.  If we assume Aylia's world hasn't developed that same refining technology -- and why would they? -- then aluminum would be worth a bunch.



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