Wikipedia has an entry for Orichalcum, but not for Orichalcon or Orihalcum. So make of that what you will; it's probably one of those things that can be translated several different ways from the Japanese.

In any case, it would make sense for orichalcum to appear in non-Final Fantasy games, as the metal has existed in legends since at least the time of the ancient Greeks.

'kishi: Got a list?