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Clay Minerals; March 2005; v. 40; no. 1; p. 63-66; DOI: 10.1180/0009855054010155
© 2005 Mineralogical Society of Great Britain and Ireland
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The pH-dependent transformation of schwertmannite to goethite at 25°C

U. SCHWERTMANN1,* and L. CARLSON2

1 Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising, Germany, and 2 Geological Survey of Finland, P.O. Box 96, FIN-02151 Espoo, Finland

* E-mail: USchwert{at}wzw.tum.de

(Received 17 March 2003; revised 28 June 2004)

At 25°C, synthetic schwertmannite, a common iron compound in acid mine drainage, completely converted in water to a sulphate-containing goethite within ~100 days. The rate of transformation doubled as the pH increased from 4.0 to 7.2. In deviation from its normal acicular habit, the goethite appeared as spherical aggregates.

KEYWORDS: schwertmannite, goethite, transformation, RT, pH, XRD, SEM




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