"Plato referred to a substance called oreichalkos that was 'dug out of the earth' long ago, 'being more precious in those days than anything except gold' ('Critias' 114, Benjamin Jowett's translation). Oreichalkos is generally translated as if it were derived from Greek oreias 'of or belonging to mountains' and chalkos 'copper'. Liddell and Scott's 'Greek-English Lexicon' explains this term as 'copper ore, or copper made from it'."
--Archaeology and Mythology, Andrew Gyles
"The Atlanteans were able to produce Orichalcum (Oreichalkos). Using a complicated process probably known but not exercised during the time of Plato but duplicated later by the Romans."
-- Atlantis History's page on Plato's Atlantis and Today's Atlanteans (Note also bibliographical item, PLATO'S ATLANTIS: TIMAIOS, KRITIAS, SOKRATES, ERMOKRATES.)
"[Alan Alford's] theory also explains all of the bizarre elements in the Atlantis story, such as the supernatural creation of the island, its abundance of the unknown metal oreichalkos..."
-- New Dawn Magazine's review of the book, The Atlantis Secret, Alan Alford
"The process [of making brass] seems to have begun in the first half of the first millennium BC somewhere in the Near or Middle East, and over the next few centuries there are occasional references to oreichalkos, 'mountain' or latterly 'golden copper', in the Greek literature of those times."
-- The British History Museum's article on Europe's Earliest Brass
"From the 7th Century BC, the Greeks commented upon brass or oreichalkos, but always as an expensive, exotic metal not produced in Greece."
-- ZINC AND RELATED ALLOYS : THE PIONEERING TRADITIONS IN THE ANCIENT AND MEDIEVAL INDIA, Professor Arun Kumar Biswas