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Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA

Published online by Cambridge University Press:  02 January 2018

Anthony R. Kampf ,
Jakub Plášil ,
Anatoly V. Kasatkin ,
Joe Marty  and
Jiří Čejka
Anthony R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
Jakub Plášil
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 1999/2, 18221 Prague 8, Czech Republic
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt, 18-2, 119071, Moscow, Russia
Joe Marty
Affiliation:
5199 East Silver Oak Road, Salt Lake City, UT 84108, USA
Jiří Čejka
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00, Prague 9, Czech Republic
*
*E-mail: akampf@nhm.org
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Abstract

The new minerals klaprothite (IMA2015-087), Na6(UO2)(SO4)4(H2O)4, péligotite (IMA2015-088), Na6(UO2)(SO4)4(H2O)4 and ottohahnite (IMA2015-098),Na6(UO2)2(SO4)5(H2O)7·1.5H2O, were found in the Blue Lizard mine, San Juan County, Utah, USA, where they occur together as secondary phases. All three minerals occur as yellowish-green to greenish-yellow crystals, are brittle with irregular fracture, have Mohs hardness of ∼2½ and exhibit bright bluish-green fluorescence, and all are easily soluble in room temperature H2O. Only klaprothite exhibits cleavage; perfect on {100} and {001}. Quantitative energydispersive spectroscopy analyses yielded the empirical formulas Na6.01(U1.03O2)(S0.993O4)4(H2O)4, Na5.82(U1.02O2)(S1.003O4)4(H2O)4 and Na5.88(U0.99O2)2(S1.008O4)5(H2O)8.5 for klaprothite, péligotite and ottohahnite, respectively. Their Raman spectra exhibit similar features. Klaprothite is monoclinic, P21/c, a = 9.8271(4), b = 9.7452(3), c = 20.8725(15) Å, β = 98.743(7)°, V = 1975.66(17)Å3 and Z = 4. Péligotite is triclinic, P1̄, a = 9.81511(18), b = 9.9575(2), c = 10.6289(8) Å, α = 88.680(6)°, β = 73.990(5)°, γ = 89.205(6)°, V = 998.22(8) Å3 and Z =2. Ottohahnite is triclinic, P1̄, a = 9.97562(19), b = 11.6741(2), c = 14.2903(10) Å, α = 113.518(8)°, β = 104.282(7)°, γ = 91.400(6)°, V = 1464.59(14) Å3 and Z = 2. The structures of klaprothite(R1 = 2.22%) and péligotite (R1 = 2.28%) both contain [(UO2)(SO4)4]6– clusters in which one SO4 group has a bidentate linkage with the UO7 polyhedron; Na–O polyhedra linkclusters into thick heteropolyhedral layers and link layers into frameworks; the structures differ in the configuration of Na–O polyhedra that link the layers. The structure of ottohahnite (R1 = 2.65%) contains [(UO2)4(SO4)10]12–clusters in which each UO7 polyhedron has a bidentate linkage with one SO4 group; Na–O polyhedra link clusters into a thin heteropolyhedral slice and also link the slices into a framework. The minerals are named for Martin Heinrich Klaproth (1743–1817), Eugène-MelchiorPéligot (1811–1890) and Otto Hahn (1879–1968).

Keywords

klaprothitePéligotiteottohahnitenew mineraluranyl sulfatecrystal structureBlue Lizard mineUtahUSA
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 4 , August 2017 , pp. 753 - 779
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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Supplementary material: File

Kampf et al. supplementary material

Table 3. Powder X-ray data for klaprothite, péligotite and ottohahnite.

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