The crystal structure of a natural phase NaK[(UO2)2V2O8] and its relation to strelkinite

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A single-crystal X-ray diffraction study of novel natrural uranyl-vanadate phase, discovered in the rocks of the Hatrurim formation and close in composition to the mineral strelkinite, has been carried out. The studied crystal is orthorhombic, space group Pccn, a = 13.355(3), b = 8.2368(7), c = 10.6180(11) Å, V = 1168.0(3) Å3, Z = 4, R1 = 0.179, CSD2409185. The crystall chemical formula obtained in a course of the X-ray diffraction experiment is (Na1.12K0.88)(UO2)2(V2O8), which is in a good agreement with that calculated from the chemical analysis data (Na1.16K0.78) Σ1.94(U1.005O2)2(V2O8). Despite the high convergence parameters, the structural model can be considered as quite reliable, especially in the part of the uranyl-vanadate layers of the carnotite type. Strong diffuse scattering does not allow more precise refinement of the partially disordered sites of the interlayer cations. The mutual arrangement of the vanadate pyramids dimers in neighbor layers is unique in comparison with the crystal structures of other carnotite group minerals and related synthetic phases. It can be assumed that the studied phase is potentially a new mineral species — a dehydrated analogue of strelkinite — which cannot be approved yet due to the lack of sufficient material. Then, by analogy with tyuyamunite—metatyuyamunite pair, it can be called “metastrelkinite”.

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作者简介

I. Kornyakov

Saint Petersburg State University; Kola Science Centre, RAS

Email: vladgeo17@mail.ru

Institute of Earth Sciences, Nanomaterials Research Centre

俄罗斯联邦, Saint Petersburg; Apatity

A. Kasatkin

Fersman Mineralogical Museum, RAS

Email: vladgeo17@mail.ru
俄罗斯联邦, Moscow

M. Murashko

Saint Petersburg State University

Email: vladgeo17@mail.ru

Institute of Earth Sciences

俄罗斯联邦, Saint Petersburg

V. Gurzhiy

Saint Petersburg State University

编辑信件的主要联系方式.
Email: vladgeo17@mail.ru

Institute of Earth Sciences

俄罗斯联邦, Saint Petersburg

参考

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2. Fig. 1. Yellow crystals of NaUV on carbonate-hydrosilicate rock of the Hatrurim formation (a; field of view 10 cm) and enlarged areas (б, в) of the same sample.

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3. Fig. 2. Precision h1l images of reciprocal space slices of crystal № 1 (a) and № 2 (б). See text for details.

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4. Fig. 3. Uranyl vanadate layer (a) and side view (б) of the crystal structure of NaUV. U = yellow; V = purple; K = violet; Na = brown; O = red.

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5. Fig. 4. Projection of layer stacking in the structures of Na2[(UO2)2V2O8] (Suleimanov et al., 2012) (a), Na2[(UO2)2V2O8]∙H2O (Suleimanov et al., 2012) (б), Na2[(UO2)2V2O8]∙2H2O (Suleimanov et al., 2012) (в) NaK[(UO2)2V2O8] (г), dehydrated analogue of carnotite K2[(UO2)2V2O8] (Appleman, Evans, 1965) (д), francevillite (Mereiter, 1986) (е), vanuralite (Plášil, 2017) (ж) и vandermeerscheite (Plášil et al., 2019) (з). For clarity, the first layer is represented by white polyhedra (VO5) and atoms (U), while the second layer is shown in gray; red = oxygen.

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