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Scanning electron microscopy (SEM) images of CaCO3 polymorphs: (a) rhombohedral calcilte, (b) needle aragonite and (c) spherical vaterite. Reproduced with permission from [85], published by Elsevier, 2016. (d) XRD and (e) Raman spectra of the synthetically prepared calcite (A), aragonite (B) and vaterite (C). Reproduced with permission from [86], published by Royal Society of Chemistry (Great Britain), 2000.
