Abstract
ALTHOUGH calcite is the most stable form of calcium carbonate under Earth-surface conditions1, aragoniite is the form precipitated from aqueous solutions under a wide range of conditions. As was observed by Wray and Daniels2, for example, aragonite is precipitated at temperatures higher than 40° C, whereas at lower temperatures only calcite is formed. In the presence of Mg++ ions, however, for example in sea water, the formation of aragonite has been observed at temperatures lower than 40° C (refs. 3–8).
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References
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DE GROOT, K., DUYVIS, E. Crystal Form of Precipitated Calcium Carbonate as influenced by Adsorbed Magnesium Ions. Nature 212, 183–184 (1966). https://doi.org/10.1038/212183a0
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DOI: https://doi.org/10.1038/212183a0
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