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Siudaite, Na8(Mn2+2Na)Ca6Fe3+3Zr3NbSi25O74(OH)2Cl·5H2O: a new eudialyte-group mineral from the Khibiny alkaline massif, Kola Peninsula

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Abstract

The new eudialyte-group mineral siudaite, ideally Na8(Mn2+2Na)Ca6Fe3+3Zr3NbSi25O74(OH)2Cl·5H2O, was discovered in a peralkaline pegmatite situated at the Eveslogchorr Mt., Khibiny alkaline massif, Kola Peninsula, Russia. The associated minerals are aegirine, albite, microcline, nepheline, astrophyllite, and loparite-(Ce). Siudaite forms yellow to brownish-yellow equant anhedral grains up to 1.5 cm across. Its lustre is vitreous, and the streak is white. Cleavage is none observed. The Mohs’ hardness is 4½. Density measured by hydrostatic weighing is 2.96(1) g/cm3. Density calculated using the empirical formula is equal to 2.973 g/cm3. Siudaite is nonpleochroic, optically uniaxial, negative, with ω = 1.635(1) and ε = 1.626(1) (λ = 589 nm). The IR spectrum is given. The chemical composition of siudaite is (wt%; electron microprobe, H2O determined by HCN analysis): Na2O 8.40, K2O 0.62, CaO 9.81, La2O3 1.03, Ce2O3 1.62, Pr2O3 0.21, Nd2O3 0.29, MnO 6.45, Fe2O3 4.51. TiO2 0.54, ZrO2 11.67, HfO2 0.29, Nb2O5 2.76, SiO2 47.20, Cl 0.54, H2O 3.5, –O = Cl − 0.12, total 99.32. According to Mössbauer spectroscopy data, all iron is trivalent. The empirical formula (based on 24.5 Si atoms pfu, in accordance with structural data) is [Na7.57(H2O)1.43]Σ9(Mn1.11Na0.88Ce0.31La0.20Nd0.05Pr0.04K0.41)Σ3(H2O)1.8(Ca5.46Mn0.54)Σ6(Fe3+1.76Mn2+1.19)Σ2.95Nb0.65(Ti0.20Si0.50)Σ0.71(Zr2.95Hf0.04Ti0.01)Σ3Si24.00Cl0.47O70(OH)2Cl0.47·1.82H2O. The crystal structure was determined using single-crystal X-ray diffraction data. The new mineral is trigonal, space group R3m, with a = 14.1885(26) Å, c = 29.831(7) Å, V = 5200.8(23) Å3 and Z = 3. Siudaite is chemically related to georgbarsanovite and is its analogue with Fe3+-dominant M2 site. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 6.38 (60) (–114), 4.29 (55) (–225), 3.389 (47) (131), 3.191 (63) (–228). 2.963 (100) (4–15), 2.843 (99) (–444), 2.577 (49) (3–39). Siudaite is named after the Polish mineralogist and geochemist Rafał Siuda (b. 1975).

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Acknowledgements

This work was financially supported by the Russian Foundation for Basic Research, grants nos. 18-55-18003 (in part of mineralogical and chemical data), 16-05-00739 (in part of single-crystal X-ray analysis) and Russian Science Foundation, Grant No. 14-17-00048 (in part of investigations of physical properties). The authors are grateful to Dr. Axel Sjöqvist and Dr. Jiři Sejlora for valuable comments. The authors thank the Centre for X-ray Diffraction Studies of SPSU and Center for Molecule Composition Studies of INEOS RAS for instrumental support.

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Author notes

  1. Sergey M. Aksenov

    Present address: Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, IN, 46556, USA

Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432, Russia

    Nikita V. Chukanov & Svetlana A. Vozchikova

  2. Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991, Russia

    Nikita V. Chukanov

  3. FSRC “Crystallography and Photonics”, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    Ramiza K. Rastsvetaeva & Sergey M. Aksenov

  4. Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55 str. 00-818, Warsaw, Poland

    Łukasz Kruszewski

  5. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, GSP-1, Vavilova St. 28, V-334, Moscow, 119991, Russia

    Sergey M. Aksenov

  6. Faculty of Physics, Moscow State University, Vorobievy Gory 1-2, Moscow, 119991, Russia

    Vyacheslav S. Rusakov

  7. Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 St., Petersburg, Russia

    Sergey N. Britvin

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Fig. 1S

Powder IR absorption spectra of (a) ikranite and (b) georgbarsanovite drawn using data from Chukanov (2014) (TIF 2096 KB)

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Chukanov, N.V., Rastsvetaeva, R.K., Kruszewski, Ł. et al. Siudaite, Na8(Mn2+2Na)Ca6Fe3+3Zr3NbSi25O74(OH)2Cl·5H2O: a new eudialyte-group mineral from the Khibiny alkaline massif, Kola Peninsula. Phys Chem Minerals 45, 745–758 (2018). https://doi.org/10.1007/s00269-018-0959-9

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