Even though no fantasy metals have been named in the series proper, to my best recollection, there are still some metals from fantasy settings that do pop up in fan works, while not always being outright named. While metals like Iron, Steel, Gold, and Silver are all real world metals and are shown or inferred to exist within MLP FiM there are other metals that some fans have implied could exist in the world of the series as well, I haven't found any immediate examples to use but I am quite sure

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