From Greek ὀρείχαλκος (oreíkhalkos), from dative singular of ὄρος (óros, “mountain”) + χαλκός (khalkós, “copper”).
"...Atlantis, which, as was saying, was an island greater in extent than Libya and Asia... In the first place, they dug out of the earth whatever was to be found there, solid as well as fusile, and that which is now only a name and was then something more than a name, orichalcum, was dug out of the earth in many parts of the island, being more precious in those days than anything except gold." —Plato, Critias
