A chart showing both the radii and valences of the atoms and ions which enter into minerals can easily be constructed by pressing transparent colored Zip-a-tone circles onto a large size (76″ × 52″) periodic chart of the elements (Fig. 1). The chart is entirely visual and at a glance one can tell the valence of the ion and its relative size. It has proven to be particularly useful in teaching mineralogy and geology courses dealing vviih mineral formation. The chart is easily amenable to changes as the colored Zip-a-tone circles are easily replaceable.

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