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. 2011 Jul 22;6(7):e22338. doi: 10.1371/journal.pone.0022338

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Goffredo et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Crystallization experiments of calcium carbonate from 10 mM CaCl₂ solution with a Mg/Ca molar ratio equal to 5 (Ctrl5) and in the presence of soluble organic matrix (SOM), insoluble organic matrix (IOM) or both additives (IOM+SOM). The direction of the crystallographic c-axis of aragonite is indicated. left Scanning electron microscope images, the insets show samples details right FTIR spectra of the precipitated. The main absorption bands of calcium carbonate are indicated.