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

Armel Le Bail, Peter W. Stephens and Francis Hubert
A crystal structure for the souzalite/gormanite series from synchrotron powder diffraction data
European Journal of Mineralogy (August 2003) 15 (4): 719-723

Abstract

In absence of suitable single crystal due to polysynthetic twinning, the crystal structure of a specimen in the souzalite/gormanite series (Fe,Mg) (sub 3) (Al,Fe) (sub 4) (PO (sub 4) ) (sub 4) (OH) (sub 6) .2H (sub 2) 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) Aa; alpha = 90.158(1), beta = 109.938(1), gamma = 81.330(1) degrees ; V = 404.02(1) Aa (super 3) ; Z = 1. The structure consists of infinite chains of alternating [FeO (sub 6) ], [MgO (sub 6) ] and [AlO (sub 6) ] octahedra sharing faces and/or edges. These chains are connected by corners with clusters of three corner-sharing [AlO (sub 6) ] octahedra, forming octahedral layers which are interconnected by [PO (sub 4) ] groups. A comparison with other minerals of similar composition and structure is made (dufrenite, burangaite).


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 4
Title: A crystal structure for the souzalite/gormanite series from synchrotron powder diffraction data
Affiliation: Universite du Maine, Laboratoire des Fluorures, Le Mans, France
Pages: 719-723
Published: 200308
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 13
Accession Number: 2003-070564
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N60°00'00" - N70°00'00", W141°00'00" - W125°00'00"
Secondary Affiliation: Brookhaven National Laboratory, USA, United StatesAssociation des Micro Monteurs de Mineraux de Montigny-le-Tilleul, BEL, Belgium
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200321
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