Level Up & OSR Enthusiast
I have a high tolerance for fiddliness.I have orichalcum in my game.
Too fiddly for my taste. Also, having armor and weapons be automatically +1 seems a bit much- it makes this metal more combat-effective than adamantine. That said, if neither the fiddliness nor the comparison to adamantine bother you, this could work.
In my campaign, orichalcum is a coppery metal. It's a true metal on its own, not an alloy or compound. It's not especially hard; it is useful in that it interferes with scrying, divination, and teleportation.