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The crystal structures of synthetics Fe₂(SO₄)₃(H₂O)₅ and the type specimen of lausenite

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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