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Crystal structure of bassetite and saleeite; new insight into autunite-group minerals

Fabrice Dal Bo, Frederic Hatert, Florias Mees, Simon Philippo, Maxime Baijot and Francois Fontaine
Crystal structure of bassetite and saleeite; new insight into autunite-group minerals (in The 8 (super th) European conference on Mineralogy and spectroscopy, Giovanni Andreozzi (editor), Ferdinando Bosi (editor) and Francesco Di Benedetto (editor))
European Journal of Mineralogy (June 2016) 28 (3): 663-675

Abstract

The crystal structures of two autunite-group minerals have been solved recently. The crystal structure of bassetite, Fe (super 2+) [(UO (sub 2) )(PO (sub 4) )] (sub 2) (H (sub 2) O) (sub 10) , from the type locality in Cornwall, United Kingdom (Basset Mines) was solved for the first time. Bassetite is monoclinic, space group P2 (sub 1) /n, a = 6.961(1), b = 20.039(2), c = 6.974(1) A and b = 90.46(1). The crystal structure of saleeite, Mg[(UO (sub 2) )(PO (sub 4) )] (sub 2) (H (sub 2) O) (sub 10) , from Shinkolobwe, Democratic Republic of Congo, was also solved. Saleeite is monoclinic, space group P2 (sub 1) /n, a = 6.951(1), b = 19.942(1), c = 6.967(1) A and b = 90.58(1). The crystal structure investigation of bassetite (R (sub 1) = 0.0658 for 1879 observed reflections with F (sub o) > or = 4sigma (sub F) ) and saleeite (R (sub 1) = 0.0307 for 1990 observed reflections with F (sub o) > or = 4sigma s (sub F) ) confirms that both minerals are topologically identical and that bassetite contains ten water molecules per formula unit. Their structure contains autunite-type sheets, [(UO (sub 2) )(PO (sub 4) )] (super -) , consisting of corner-sharing UO (sub 6) square bipyramids and PO (sub 4) tetrahedra. Iron and magnesium are surrounded by water molecules to form Fe(H (sub 2) O) (sub 6) or Mg(H (sub 2) O) (sub 6) octahedra located in interlayer, between the autunite-type sheets. Two isolated independent water molecules are also located in interlayer. Energy-dispersive X-ray spectroscopy analysis confirmed the chemical composition obtained from structure refinement. These new data prompt a re-assessment of minerals of the autunite and meta-autunite groups.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 28
Serial Issue: 3
Title: Crystal structure of bassetite and saleeite; new insight into autunite-group minerals
Title: The 8 (super th) European conference on Mineralogy and spectroscopy
Author(s): Dal Bo, FabriceHatert, FredericMees, FloriasPhilippo, SimonBaijot, MaximeFontaine, Francois
Author(s): Andreozzi, Giovannieditor
Author(s): Bosi, Ferdinandoeditor
Author(s): Di Benedetto, Francescoeditor
Affiliation: Universite de Liege, Laboratoire de Mineralogie, Liege, Belgium
Affiliation: Sapienza University of Rome, Rome, Italy
Pages: 663-675
Published: 201606
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: 8th European conference on Mineralogy and spectroscopy
Meeting location: Rome, ITA, Italy
Meeting date: 20150909Sept. 9-11, 2015
References: 38
Accession Number: 2016-085345
Categories: Mineralogy of non-silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
S11°02'55" - S11°02'55", E26°33'03" - E26°33'03"
N50°12'41" - N50°12'41", W05°14'27" - W05°14'27"
Secondary Affiliation: Royal Museum for Central Africa, BEL, BelgiumMusee National d'Histoire Naturelle, LUX, Luxembourg
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201641
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