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Science 12 September 1969:
Vol. 165. no. 3898, pp. 1119 - 1121
DOI: 10.1126/science.165.3898.1119
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Articles

Hydrocalcite (CaCO3 • H2O) and Nesquehonite (MgCO3 • 3H2O) in Carbonate Scales

Hannelore Marschner 1

1 Laboratorium für Sedimentforschung, University of Heidelberg, Heidelberg, Germany

Hydrocalcite (CaCO3 • H2O) with exactly one molecule of hydrate water is the main component of carbonate scales deposited from cold water in contact with air. When the magnesium content of the water is high, the hydrocalcite occurs together with MgCO3 • 3H2O (nesquehonite). From the conditions under which hydrocalcite is transformed into calcite and aragonite, it appears that in some cases aragonite in nature may be formed by way of an intermediary of CaCO3 • H2O.


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