"There's not much in the way of written-down arrangements - just things that Gerry and I have worked out, from playing spontaneously together and hanging on to whatever seems to fall in right."

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As mineralogy constitutes a part of chemistry, it is clear that this arrangement [of minerals] must derive its principles from chemistry. The most perfect mode of arrangement would certainly be to allow bodies to follow each other according to the order of their electro-chemical properties, from the most electro-negative, oxygen, to the most electro-positive, potassium; and to place every compound body according to its most electro-positive ingredient.

— Jons Jacob Berzelius