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Maybe shell formation prefers magnesium but calcium is more abundant so it appears as though shell formation is about calcium and magnesium is the impurity?

Also note that the Alkaline Earth Metals are Berylium, Magnesium, Calcium, Strontium, Barium, Radium. Magnesium ans Calcium are actually quite similar chemically, but Magnesium is both lighter and more reactive than Calcium.

Those whom the Gods wish to destroy They first make mad. -- Euripides

by Migeru (migeru at eurotrib dot com) on Fri Oct 6th, 2006 at 11:29:55 AM EST
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