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Leydetite, Fe(UO2)(SO4)2(H2O)11, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France

Published online by Cambridge University Press:  05 July 2018

J. Plášil ,
A. V. Kasatkin ,
R. Škoda ,
M. Novák ,
A. Kallistová ,
M. Dušek ,
R. Skála ,
K. Fejfarová ,
J. Čejka  and
N. Meisser
...Show all authors
J. Plášil*
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
A. V. Kasatkin
Affiliation:
V/O “Almazjuvelirexport”, Ostozhenka Street, 22, block 1, 119034 Moscow, Russia
R. Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 4 611 37, Brno, Czech Republic
M. Novák
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 4 611 37, Brno, Czech Republic
A. Kallistová
Affiliation:
Institute of Geology ASCR, v.v.i., Rozvojová 269, Prague 6, 16500, Czech Republic
M. Dušek
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
R. Skála
Affiliation:
Institute of Geology ASCR, v.v.i., Rozvojová 269, Prague 6, 16500, Czech Republic
K. Fejfarová
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
J. Čejka
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 170, CZ-193 00, Prague 9, Czech Republic
N. Meisser
Affiliation:
Musée géologique cantonal and Laboratoire des rayons-X, Institut de minéralogie et de géochimie, Université de Lausanne, 1015 Lausanne-Dorigny, Switzerland
H. Goethals
Affiliation:
Musée de l’Institut royal des sciences naturelles de Belgique, Section mineralogy, Rue Vautier 29, 1000 Brussels, Belgium
V. Machovič
Affiliation:
Institute of Chemical Technology, Prague, Technická 5, CZ–16628, Prague 6, Czech Republic Institute of Rock Structures and Mechanics ASCR, v.v.i., V Holešovičkách 41, CZ–18209, Prague 8, Czech Republic
L. Lapčák
Affiliation:
Institute of Chemical Technology, Prague, Technická 5, CZ–16628, Prague 6, Czech Republic
*
* E-mail: [email protected]
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Abstract

Leydetite, monoclinic Fe(UO2)(SO4)2(H2O)11(IMA 2012–065), is a new supergene uranyl sulfate from Mas d'Alary, Lodève, Hérault, France. It forms yellow to greenish, tabular, transparent to translucent crystals up to 2 mm in size. Crystals have a vitreous lustre. Leydetite has a perfect cleavage on (001). The streak is yellowish white. Mohs hardness is ∼2. The mineral does not fluoresce under long- or short-wavelength UV radiation. Leydetite is colourless in transmitted light, non-pleochroic, biaxial, with α = 1.513(2), γ = 1.522(2) (further optical properties could not be measured). The measured chemical composition of leydetite, FeO 9.28, MgO 0.37, Al2O30.26, CuO 0.14, UO340.19, SO321.91, SiO20.18, H2O 27.67, total 100 wt.%, leads to the empirical formula (based on 21 O a.p.f.u.), (Fe0.93Mg0.07Al0.04Cu0.01)Σ1.05(U1.01O2)(S1.96Si0.02)Σ1.98O8(H2O)11. Leydetite is monoclinic, space group C2/c, with a = 11.3203(3), b = 7.7293(2), c = 21.8145(8) Å, β = 102.402(3)°, V = 1864.18(10) Å3, Z = 4, and Dcalc = 2.55 g cm–3. The six strongest reflections in the X-ray powder diffraction pattern are [dobs in Å (I) (hkl)]: 10.625 (100) (002), 6.277 (1) (11), 5.321 (66) (004), 3.549 (5) (006), 2.663 (4) (008), 2.131 (2) (0 0 10). The crystal structure has been refined from single-crystal X-ray diffraction data to R1 = 0.0224 for 5211 observed reflections with [I > 3σ(I)]. Leydetite possesses a sheet structure based upon the protasite anion topology. The sheet consists of UO7 bipyramids, which share four of their equatorial vertices with SO4 tetrahedra. Each SO4 tetrahedron, in turn, shares two of its vertices with UO7 bipyramids. The remaining unshared equatorial vertex of the bipyramid is occupied by H2O, which extends hydrogen bonds within the sheet to one of a free vertex of the SO4 tetrahedron. Sheets are stacked perpendicular to the c direction. In the interlayer, Fe2+ ions and H2O groups link to the sheets on either side via a network of hydrogen bonds. Leydetite is isostructural with the synthetic compound Mg(UO2)(SO4)2(H2O)11. The name of the new mineral honours Jean Claude Leydet (born 1961), an amateur mineralogist from Brest (France), who discovered the new mineral.

Keywords

leydetitenew mineraluranyl sulfateoxidation zonecrystal structureRaman spectroscopyinfrared spectroscopyMas d’AlaryLodève
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 4 , June 2013 , pp. 429 - 441
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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