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As it turns out, there is an error in the Feruchemical table when Brandon put it in Mistborn 2. If you look closely, Determination (electrum) doesn't belong in its group. The group that it is in is obviously more physical powers. Determination was supposed to be a mental metal, and Warmth was supposed to be in that Physical group. He just made a mistake originally. But it turns out that Feruchemy obeys different rules than Allomancy, so Brandon isn't retconning it, but saying that Feruchemy works differently now. Apparently there was going to be a table of Feruchemy at the end of Alloy of Law, but it wasn't ready because Isaac kept thinking like an Allomancer. Feruchemy has its own rules (for example, Brandon confirmed that pewter does steal Feruchemical health, probably because that second group of physical Feruchemical powers are also "physical", so pewter can steal them.) Hemalurgy also obeys different rules.
I just saw the Feruchemical Table medallion on the store, and it reminded me of a question that was raised on the forums a little while back. It appears there's a mistake in the metal pattern, with regards to pure metals and alloys; Chromium and nicrosil are in the opposite places from what we'd expect. I've attached a color-coded example; with pure metals in green, and alloys in blue, it's evident that the Spiritual quadrant has them criss-cross, unlike the other quadrants. The medallion matches the poster's layout; that's where the question originally arose, from the poster. Is there a reason for this switch? Or is it an error in the pattern?
I just looked over the chart, and rather than the metals being in the wrong places, it looks like I accidentally swapped the symbols. So the medallion is correct. It's the symbols for chromium and nicrosil that ought to be swapped. I've cc'd Peter on this email, too, so he's aware of the mistake. I'll try to remedy this for future printings.