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American Mineralogist; November 2003; v. 88; no. 11-12; p. 1915-1918
© 2003 Mineralogical Society of America
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Iron-rich precipitates in a mine drainage environment: Influence of pH on mineralogy

Enver Murad1,* and Petr Rojík2

1 Bayerisches Geologisches Landesamt, Leopoldstrasse 30, D-95603 Marktredwitz, Germany
2 Sokolovská uhelná a.s., Jednoty 1628, CZ-35645 Sokolov, Czech Republic

Correspondence: * E-mail: enver.murad{at}gla.bayern.de

Ochreous precipitates deposited by waters draining a sulfide-rich lignite seam exposed in an abandoned mine in the Czech Republic show marked variations in color and mineralogy as a function of effluent pH. When initially formed under acidic (pH 3.7) conditions, the precipitates are orange in color and their mineralogy is dominated by schwertmannite. Following confluence with alkaline (pH 8.3) waters that have not been affected by mine drainage, the effluent pH rises to 7.3, the color changes abruptly to reddish-brown, and the principal precipitate mineral is a two-line ferrihydrite. This change in mineralogy and the associated variation in color can thus serve as direct indicators of the genetic environments under which the minerals were formed.




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E. MURAD and P. ROJIK
Iron mineralogy of mine-drainage precipitates as environmental indicators: review of current concepts and a case study from the Sokolov Basin, Czech Republic
Clay Minerals, December 1, 2005; 40(4): 427 - 440.
[Abstract] [Full Text] [PDF]

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U. SCHWERTMANN and L. CARLSON
The pH-dependent transformation of schwertmannite to goethite at 25{degrees}C
Clay Minerals, March 1, 2005; 40(1): 63 - 66.
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