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American Mineralogist; February 2005; v. 90; no. 2-3; p. 411-416; DOI: 10.2138/am.2005.1701
© 2005 Mineralogical Society of America
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The crystal structures of synthetics Fe2(SO4)3(H2O)5 and the type specimen of lausenite

Juraj Majzlan1,*, Cristian Botez2,3 and Peter W. Stephens2,3

1 Department of Geosciences, Princeton University, Princeton, New Jersey 08544, U.S.A.
2 Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794, U.S.A.
3 National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, U.S.A.

Correspondence: * E-mail: Juraj.Majzlan{at}minpet.uni-freiburg. Present Address: Institute of Mineralogy, Petrology and Geochemistry, Albert-Ludwig-University of Freiburg, Albertstr. 23b, Freiburg, D-79104, Germany.

An iron sulfate of nominal composition Fe2(SO4)3(H2O)5 has been synthesized and its structure determined and refined by high resolution powder diffraction using synchrotron radiation. The structure consists of corrugated slabs in which iron octahedra are linked by sulfate tetrahedra in the monoclinic space group P21/m with lattice parameters a = 10.711(1), b = 11.085(1), and c = 5.5747(5) Å, ß = 98.853(3)°. We compare these results with the type specimen of lausenite from Jerome, Arizona, which has monoclinic lattice parameters a = 10.679(2), b = 11.053(3), and c = 5.567(1) Å, ß = 98.89(1)°. Weight loss experiments show that it is currently a pentahydrate, despite earlier reports that lausenite is a hexahydrate. We argue that our synthetic material provides a structure determination for the type specimen of lausenite.




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