Letter | Published:

Crystal Form of Precipitated Calcium Carbonate as influenced by Adsorbed Magnesium Ions

Naturevolume 212pages183184 (1966) | Download Citation



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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  1. 1

    Simmons, G., and Bell, P., Science, 139, 1197 (1963).

  2. 2

    Wray, J. L., and Daniels, F., J. Amer. Chem. Soc., 79, 2031 (1957).

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    Vetter, H., Z. f. Krist., 48, 45 (1911).

  4. 4

    Köhler, E., Chemie der Erde, 6, 257 (1931).

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    Togari, K., and Togari, S., J. Fac. Sci., Hokkaido Univ., Ser. IV, 9, 55 (1955).

  6. 6

    Lippmann, F., Fortschr. Mineral., 38, 156 (1960).

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    Kitano, Y., Bull. Chem. Soc. Japan, 35, 1973 (1962).

  8. 8

    Groot, K. de, Nature, 207, 404 (1965).

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    Cloud, P. E., U.S. Geol. Survey Prof. Paper, 350, 121 (1962).

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    Friedman, G. M., J. Sed. Petrol, 34, 777 (1964).

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    Berner, R. A., Amer. J. Sci., 264, 1 (1966).

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  1. Koninklijke/Shell Exploratie en Produktie Laboratorium, Rijswijk, The Netherlands

    • K. DE GROOT
    •  & E. M. DUYVIS


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