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A crystal structure for the souzalite/gormanite series from synchrotron powder diffraction data

¹ Universite du Maine, Laboratoire des Fluorures, CNRS UMR 6010, Avenue O. Messiaen, F-72085 Le Mans 9, France Corresponding author, e-mail: lebail@univ-lemans.fr
² National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973, USA
³ Association des Micro Monteurs de Minéraux de Montigny-le-Tilleul, 70 rue de Marbaix, B-6110 Montigny-le-Tilleul, Belgique

In absence of suitable single crystal due to polysynthetic twinning, the crystal structure of a specimen in the souzalite/gormanite series (Fe, Mg)₃(Al, Fe)₄(PO₄)₄(OH)₆-2H_O is determined ab initio from synchrotron powder diffraction data. The crystals belong to space group P1, the cell is different from previously reported with a = 7.2223(1), b = 11.7801(1), c = 5.1169(1) Å; = 90.158(1), ß = 109.938(1), = 81.330(1)°; V = 404.02(1) Å₃; Z = 1. The structure consists of infinite chains of alternating [FeO₆], [MgO₆] and [AlO₆] octahedra sharing faces and/or edges. These chains are connected by corners with clusters of three corner-sharing [AlO₆] octahedra, forming octahedral layers which are interconnected by [PO₄] groups. A comparison with other minerals of similar composition and structure is made (dufrénite, burangaite).

Key-words: souzalite, gormanite, crystal structure, powder diffraction, synchrotron radiation..

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