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This figure, across an important part of the periodic table, shows the chemistry of simple oxysalt minerals. Silicates can acommodate 1+ to 4+ cations, but carbonates, phosphates, and sulfates can only accommodate 1+ and 2+ cations, and nitrates can only accommodate 1+ cations. Arranging the periodic table in terms of ions, as in the
Earth Scientist's Periodic Table of the Elements and Their Ions, makes these groups apparent, as the increasingly high ionic potential of the Si4+ to C5+ to P5+ to S6+ to N%+ central cation progressively causes more repulsion of other cations of high ionic potential.
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