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This figure shows variation in the melting temperature of oxides of hard cations. Mineral names are shown for minerals; many of the substances for which Ts are shown aren't minerals (they don't occur in nature). The ions that make oxides with high melting Ts are also the ions that are concentrated in soils and that enter early-forming phases in igneous rocks (as shown with brown and red symbols, respectively, on the
Earth Scientist's Periodic Table of the Elements and Their Ions). Note that the arrangement of ions in the Earth Scientist's Periodic Table of the Elements and Their Ions makes these melting temperatures follow a pattern easily predicted from the contours of equal ionic potential. It's much the same pattern as that in the solubility of oxides shown in Accompanying Figure 6.
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