Letter | Published:

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

Nature volume 212, pages 183184 (08 October 1966) | Download Citation

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

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

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    , Nature, 207, 404 (1965).

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

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    , J. Sed. Petrol, 34, 777 (1964).

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

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

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https://doi.org/10.1038/212183a0

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