Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-13T08:51:19.665Z Has data issue: false hasContentIssue false
  • English
  • Français

Hydroxynatropyrochlore, (Na,Сa,Ce)2Nb2O6(OH), a new member of the pyrochlore group from the Kovdor phoscorite–carbonatite pipe, Kola Peninsula, Russia

Published online by Cambridge University Press:  15 May 2018

Gregory Yu. Ivanyuk ,
Victor N. Yakovenchuk ,
Taras L. Panikorovskii ,
Nataliya Konoplyova ,
Yakov A. Pakhomovsky ,
Ayya V. Bazai ,
Vladimir N. Bocharov  and
Sergey V. Krivovichev
Gregory Yu. Ivanyuk
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Victor N. Yakovenchuk
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Taras L. Panikorovskii
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia Department of Crystallography, St. Petersburg State University, 7–9 University Emb, St. Petersburg 199034, Russia;
Nataliya Konoplyova
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Yakov A. Pakhomovsky
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Ayya V. Bazai
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Vladimir N. Bocharov
Affiliation:
Geo Environmental Centre “Geomodel”, St. Petersburg State University, Ul'yanovskaya Str., St. Petersburg 198504, Russia
Sergey V. Krivovichev*
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia Department of Crystallography, St. Petersburg State University, 7–9 University Emb, St. Petersburg 199034, Russia;
*
Corresponding author: Sergey V. Krivovichev, Email: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Hydroxynatropyrochlore, (Na,Сa,Ce)2Nb2O6(OH), is a new Na–Nb–OH-dominant member of the pyrochlore supergroup from the Kovdor phoscorite–carbonatite pipe, Kola Peninsula, Russia. It is cubic, Fd$\bar{3}$m, a = 10.3211(3) Å, V = 1099.46(8) Å3 and Z = 8 (from powder diffraction data) or a = 10.3276(5) Å, V = 1101.5(2) Å3 and Z = 8 (from single-crystal diffraction data). Hydroxynatropyrochlore is a characteristic accessory mineral of the low-carbonate phoscorite in the contact zone of the phoscorite–carbonatite pipe with host foidolite as well as in the carbonate-rich phoscorite and carbonatite of the pipe axial zone. It usually forms zonal cubic or cubooctahedral crystals (up to 0.5 mm in diameter) with irregularly shaped relics of amorphous U–Ta-rich hydroxykenopyrochlore inside. Characteristic associated minerals include rock-forming calcite, dolomite, forsterite, hydroxylapatite, magnetite and phlogopite, accessory baddeleyite, baryte, barytocalcite, chalcopyrite, chamosite–clinochlore, galena, gladiusite, juonniite, ilmenite, magnesite, pyrite, pyrrhotite, quintinite, spinel, strontianite, valleriite and zirconolite. Hydroxynatropyrochlore is pale brown, with an adamantine to greasy lustre and a white streak. The cleavage is average on {111} and the fracture is conchoidal. Mohs hardness is ~5. In transmitted light, the mineral is light brown, isotropic and n = 2.10(5) (λ = 589 nm). The calculated and measured densities are 4.77 and 4.60(5) g cm−3, respectively. The mean chemical composition determined by electron microprobe is: F 0.05, Na2O 7.97, CaO 10.38, TiO2 4.71, FeO 0.42, Nb2O5 56.44, Ce2O3 3.56, Ta2O5 4.73, ThO2 5.73, UO2 3.66, total 97.65 wt.%. The empirical formula calculated on the basis of Nb + Ta + Ti = 2 apfu is (Na1.02Ca0.73Ce0.09Th0.09 U0.05${\rm Fe}_{{\rm 0}{\rm. 02}}^{2 +} $)Σ2.00(Nb1.68Ti0.23Ta0.09)Σ2.00O6.03(OH1.04F0.01)Σ1.05. The simplified formula is (Na,Ca,Ce)2Nb2O6(OH). The mineral dissolves slowly in hot HCl. The strongest X-ray powder-diffraction lines [listed as (d in Å)(I)(hkl)] are as follows: 5.96(47)(111), 3.110(30)(311), 2.580(100)(222), 2.368(19)(400), 1.9875(6)(333), 1.8257(25)(440) and 1.5561(14)(622). The crystal structure of hydroxynatropyrochlore was refined to R1 = 0.026 on the basis of 80 unique observed reflections. The mineral belongs to the pyrochlore structure type A2B2O6Y1 with octahedral framework of corner-sharing BO6 octahedra with A cations and OH groups in the interstices. The Raman spectrum of hydroxynatropyrochlore contains characteristic bands of the lattice, BO6, B–O and O–H vibrations and no characteristic bands of the H2O vibrations. Within the Kovdor phoscorite–carbonatite pipe, hydroxynatropyrochlore is the latest hydrothermal mineral of the pyrochlore supergroup, which forms external rims around grains of earlier U-rich hydroxykenopyrochlore and separated crystals in voids of dolomite carbonatite veins. The mineral is named in accordance with the pyrochlore supergroup nomenclature.

Keywords

hydroxynatropyrochlorenew mineralsodium-calcium niobatephoscoritecarbonatiteKovdor
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 1 , February 2019 , pp. 107 - 113
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

Associate Editor: G. Diego Gatta

References

Andrade, M., Atencio, D., Persiano, A. and Ellena, J. (2013) Fluorcalciomicrolite, (Ca,Na,□)2Ta2O6F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine, 77, 2989–2996.Google Scholar
Andrade, M., Atencio, D., Chukanov, N. and Ellena, J. (2015) Hydrokenomicrolite, (□,H2O)2Ta2(O,OH)6(H2O), a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. American Mineralogist, 98, 292–296.Google Scholar
Andrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.H., Persiano, A.I.C., Goeta, A.E. and Ellena, J. (2016) Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine, 81, 555–564.Google Scholar
Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R. and Kartashov, P.M. (2010) The pyrochlore supergroup of minerals nomenclature. The Canadian Mineralogist, 48, 673–698.Google Scholar
Atencio, D., Ciriotti, M.E. and Andrade, M.B. (2013) Fluorcalcioroméite, (Ca,Na)2Sb5+2(O,OH)6F, a new roméite-group mineral from Starlera mine, Ferrera, Grischun, Switzerland: description and crystal structure. Mineralogical Magazine, 77, 467–473.Google Scholar
Atencio, D., Andrade, M.B., Bastos Neto, A.C. and Pereira, V.P. (2017) Ralstonite renamed hydrokenoralstonite, coulsellite renamed fluornatrocoulsellite, and their incorporation into the pyrochlore supergroup. The Canadian Mineralogist, 55, 115–120.Google Scholar
Bahfenne, S. and Frost, R.L. (2010) Raman spectroscopic study of the antimonate mineral roméite. Spectrochimica Acta A, 75, 637–639.Google Scholar
Biagioni, C., Orlandi, P., Nestola, F. and Bianchin, S. (2013) Oxycalcioroméite, Ca2Sb2O6O, from Buca della Vena mine, Apuan Alps, Tuscany, Italy: a new member of the pyrochlore supergroup. Mineralogical Magazine, 77, 3027–3037.Google Scholar
Britvin, S.N., Dolivo-Dobrovolsky, D.V. and Krzhizhanovskaya, M.G. (2017) Software for processing of X-ray powder diffraction data obtained from the curved image plate detector of Rigaku RAXIS Rapid II diffractometer. Zapiski Rossiiskogo Mineralogicheskogo Obshestva, 146(3), 104–107 [in Russian].Google Scholar
Bruker-AXS (2014) APEX2. Version 2014.11-0. Madison, Wisconsin, USA.Google Scholar
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine, 77, 13–20.Google Scholar
Epstein, E.M., Basmanov, V.N., Berezina, L.A., Gol'dfurt, T.L., Zhuravleva, L.N., Nechaeva, E.A., Sokolov, S.V. and Chernyshova, L.V. (1970) The appropriateness of allocation, the mineralogical and geochemical features and valuation of iron-phosphorus and rare-metal ores of the Kovdor deposit. Report about scientific works. Vol.1. Moscow, Russia (Archives of the Geological Institute of the Kola Science Centre of RAN) 217 pp. [in Russian].Google Scholar
Fan, G., Ge, X., Li, G., Yu, A. and Shen, G. (2016) Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China. Mineralogical Magazine, 81, 743–751.Google Scholar
Gargori, C., Galindo, R., Cerro, S., García, A., Llusar, M. and Monrós, G. (2010) Synthesis of a new CaxY2–xVxSn2–xO7 yellow pigment. Physics Procedia, 8, 84–87.Google Scholar
Hålenius, U. and Bosi, F. (2013) Oxyplumboroméite, Pb2Sb2O7, a new mineral species of the pyrochlore supergroup from Harstigen mine, Värmland, Sweden. Mineralogical Magazine, 77, 2931–2939.Google Scholar
Ivanyuk, G.Yu., Yakovenchuk, V.N. and Pakhomovsky, Ya.A. (2002) Kovdor. Laplandia Minerals, Apatity, 326 pp.Google Scholar
Ivanyuk, G.Yu., Kalashnikov, A.O., Pakhomovsky, Ya.A., Mikhailova, J.A., Yakovenchuk, V.N., Konopleva, N.G., Sokharev, V.A., Bazai, A.V. and Goryainov, P.M. (2016) Economic minerals of the Kovdor baddeleyite-apatite-magnetite deposit, Russia: mineralogy, spatial distribution, and ore processing optimization. Ore Geology Reviews, 77, 279–311.Google Scholar
Ivanyuk, G.Y., Yakovenchuk, V.N., Panikorovskii, T.L., Konoplyova, N., Pakhomovsky, Y.A., Bazai, A.V., Bocharov, V.N. and Krivovichev, S.V. (2017) Hydroxynatropyrochlore, IMA 2017-074. CNMNC Newsletter No. 40, December 2017, page 1580; Mineralogical Magazine, 81, 1577–1581.Google Scholar
Jingwu, Y., Li, G., Guangming, Y., Ge, X., Xu, H. and Wang, J. (2015) Fluornatropyrochlore, a new pyrochlore supergroup mineral from the Boziguoer rare earth element deposit, Baicheng County, Akesu, Xinjiang, China. The Canadian Mineralogist, 53, 455–460.Google Scholar
Kalashnikov, A.O., Yakovenchuk, V.N., Pakhomovsky, Y.A., Bazai, A.V., Sokharev, V.A., Konopleva, N.G., Mikhailova, J.A., Goryainov, P.M. and Ivanyuk, G.Yu. (2016) Scandium of the Kovdor baddeleyite–apatite–magnetite deposit (Murmansk Region, Russia): Mineralogy, spatial distribution, and potential resource. Ore Geology Reviews, 72, 532–537.Google Scholar
Li, G., Yang, G., Lu, F., Xiong, M., Ge, X., Pan, B. and de Fourestier, J. (2016) Fluorcalciopyrochlore, a new mineral species from Bayan Obo, Inner Mongolia, P.R. China. The Canadian Mineralogist, 54, 1285–1291.Google Scholar
Mączka, M., Knyazev, A.V., Kuznetsova, N.Yu., Ptak, M. and Macalik, L. (2011) Raman and IR studies of TaWO5.5, ASbWO6 (A = K, Rb, Cs, Tl) and ASbWO6·H2O (A = H, NH4, Li, Na) pyrochlore oxides. Journal of Raman Spectroscopy, 42, 529–533.Google Scholar
Mandarino, J.A. (1981) The Gladstone – Dale relationship: Part IV. The compatibility concept and its application. The Canadian Mineralogist, 19, 441–450.Google Scholar
Mikhailova, J.A., Kalashnikov, A.O., Sokharev, V.A., Pakhomovsky, Y.A., Konopleva, N.G., Yakovenchuk, V.N., Bazai, A.V., Goryainov, P.M. and Ivanyuk, G.Y. (2016) 3D mineralogical mapping of the Kovdor phoscorite–carbonatite complex (Russia). Mineralium Deposita, 51, 131–149.Google Scholar
Mills, S.J., Christy, A.G., Kampf, A.R., Birch, W.D. and Kasatkin, A. (2017) Hydroxykenoelsmoreite, the first new mineral from the Republic of Burundi. European Journal of Mineralogy, 29, 491–497.Google Scholar
Miyawaki, R., Momma, K., Matsubara, S., Sano, T., Shigeoka, M. and Horiuchi, H. (2017) Hydroxykenopyrochlore, IMA 2017-030a. CNMNC Newsletter No. 39, October 2017. Mineralogical Magazine, 81, 1285.Google Scholar
Momma, K. and Izumi, F. (2011) VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data. Journal of Applied Crystallography, 44, 1272–1276.Google Scholar
Rodionov, N.V., Belyatsky, B.V., Antonov, A.V., Kapitonov, I.N. and Sergeev, S.A. (2012) Comparative in-situ U–Th–Pb geochronology and trace element composition of baddeleyite and low-U zircon from carbonatites of the Palaeozoic Kovdor alkaline–ultramafic complex, Kola Peninsula, Russia. Gondwana Research, 21, 728–744.Google Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112–122.Google Scholar
Subbotin, V.V. and Subbotina, G.F. (2000) Minerals of the pyrochlore group in phoscorites and carbonatites of the Kola Peninsula. Vestnik MGTU, 3(2), 273–284 [in Russian].Google Scholar
Yakovenchuk, V.N., Ivanyuk, G.Yu., Pakhomovsky, Ya.A. and Men'shikov, Yu.P. (2005) Khibiny. Laplandia Minerals, Apatity, 2005. 468 pp.Google Scholar
Yakovenchuk, V.N., Ivanyuk, G.Y., Pakhomovsky, Y.A., Panikorovskii, T.L., Britvin, S.N., Krivovichev, S.K., Shilovskikh, V.V. and Bocharov, V.N. (2018) Kampelite, Ba3Mg1.5Sc4(PO4)6(OH)3·4H2O, a new very complex Ba-Sc phosphate mineral from the Kovdor phoscorite-carbonatite complex (Kola Peninsula, Russia). Mineralogy and Petrology, 112, 111–112.Google Scholar
Witzke, T., Steins, M., Doering, T., Schuckmann, W., Wegner, R. and Pöllmann, H. (2011). Fluornatromicrolite, (Na,Ca,Bi)2Ta2O6F, a new mineral species from Quixaba, Paraiba, Brazil. The Canadian Mineralogist, 49, 1105–1110.Google Scholar
Yang, G., Li, G., Xiong, M., Pan, B. and Yan, C. (2014) Hydroxycalciopyrochlore, a new mineral species from Sichuan, China. Acta Geologica Sinica, English Edition, 88, 748–753.Google Scholar
Yin, J., Li, G., Yang, G., Ge, X., Xu, H. and Wang, J. (2015) Fluornatropyrochlore, a new pyrochlore supergroup mineral from the Boziguoer rare earth element deposit, Baicheng county, Akesu, Xinjiang, China. The Canadian Mineralogist, 53, 455–460.Google Scholar
Supplementary material: File

Ivanyuk et al. supplementary material

Ivanyuk et al. supplementary material 1

Download Ivanyuk et al. supplementary material(File)
File 6.1 KB