<https://www.17thshard.com/forums/topic/22034-shards/#comment-210752>
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"Hmmm... Actually I'm starting to suspect that the 8 metallic elements and the 8 alloys aren't all paired in the strict sense. Remember, the Allomantic chart was made by Scadrians, who we know have had wrong assumptions regarding their magic system before.The Allomantic alloys of iron, chromium, and gold contain only one Allomantic element, so I guess those are properly paired. But if you look at the other alloys, you'll notice that their relationship with the Allomantic elements are a bit more complex. Pewter and bronze (and bendalloy, if it's the same thing as real life bendalloy) contain tin. Brass, bronze, and duralumin contain copper. We have at least three alloys containing more than one Allomantic element, four if Allomantic bendalloy has both cadmium and tin (real life bendalloy even has more tin than cadmium!). \nSo if (if!) there is a correlation between the metals and the Shards, then perhaps the Shards show the same sort of complexity in their groupings. \nEdit: Duralumin is the only Allomantic alloy absolutely confirmed to have two Allomantic elements, I think, but the point still stands. \n"
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