Mineral Compounds and Supplement Forms
These are not elements. They are the salts, preparations and supplement forms that minerals actually arrive in — and the form very often decides whether the mineral is absorbed, tolerated, or useful at all.
Magnesium is the clearest case: the same element as oxide, glycinate or sulfate behaves like three different products. A page here covers the preparation; the element it carries has its own page under macrominerals or trace minerals.