Mystery solved: Why seashells' mineral forms differently in seawater

Tuesday, March 3, 2015 - 11:40 in Earth & Climate

For almost a century, scientists have been puzzled by a process that is crucial to much of the life in Earth's oceans: Why does calcium carbonate, the tough material of seashells and corals, sometimes take the form of calcite, and at other times form a chemically identical form of the mineral, called aragonite, that is more soluble -- and therefore more vulnerable to ocean acidification?

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