Calcium carbonate minerals exist in seawater in two main phases: calcite and aragonite. While calcite is the most stable phase, it is aragonite that precipitates first in seawater because of the high magnesium content of the oceans today. But for a similar environment, e.g., tropical shallow water, some organisms have a calcitic shell while some other have an aragonitic one. How can organisms choose which phase composes their shell?

  • $\begingroup$ The two minerals differ only in crystal structure. changing the assembly proteins is enough. researchgate.net/publication/… $\endgroup$ – John Feb 20 '17 at 19:20

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