Here's the right side of the new table, and thus the anions. The blue lines are again contours of ionic potential, as on the left side, but they don't go far: they're -1/2, -1, and -2. That's because, as we move from I- to C4-, both charge (our numerator) and radius (our denominator) both increase. As a result, ionic potential can't vary too much. This why you rarely here much about anionic potential, whereas everyone since Goldschmidt has used cationic potential to explain geochemical behavior.

        There are nonetheless trends in the symbols on this side of the table. They are mostly counterpoints of the things we've discussed before. For example, the horizontally stetched diamonds are for minerals with cations of increasing cationic potential from blue to red, and we find them trending with increasingly negative anionic potential here (the flip side of our earlier diagrams on mineralogy). The vertically extended diamonds are for minerals formed with Cu+, Ag+, and Au+ from bronze to yellow, and they trend downward from harder anions like O2- to softer anions like Bi2-. That's again the flip side of our previous observations.


Going back to the entire table . . .  

Image                                             Image


The first slide of this presentation
The last slide of this presentation
Railsback's main page about the Earth Scientist's Periodic Table of the Elements and Their Ions
e-mail to Bruce Railsback (
Railsback's main web page
UGA Geology Department web page

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