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MR |
Hate to be that guy (okay, actually I don't ;) ...), but copper is actually relatively reactive, oxidizes quickly in a moist environment (like the game world presented, clearly), and basically never occurs in that pure state the in-game depiction implies. Copper ores usually should be of a green to greenish-blue color.
OK, sure, I do understand that there might be game design considerations behind it, concerning easy recognizability, but I think it would be a nice touch of realism :)