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Tveitite-(Y) and REE-enriched fluorite from amazonite pegmatites of the Western Keivy, Kola Peninsula, Russia: Genetic crystal chemistry of natural Ca,REE-fluorides

  • Minerals and Parageneses of Minerals
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Abstract

Tveitite-(Y) as pods up to 10 cm across has been found at Mt. Rovgora, the Western Keivy, Kola Peninsula, Russia, in an albite-quartz-amazonite pegmatite vein related to alkaline granite. Tveitite-(Y) grains (up to 4 cm) are parallel microintergrowths of two isostructural varieties, Ca9.5Na1.7Y5.2Ln2.0F42.6 and Ca11.4Na1.9Y4.4Ln1.4F42.0. The idealized structural formula (Z = 3) is (Y, Na)6(Ca, LREE)6(Ca, Na, HREE)6(Ca, Na)F42; the simplified formula is (Ca, REE, Na)13(Y, Na)6F42; space group R \( \bar 3 \) a = 17.020, c = 9.679 Å. [Lanthanoides are abbreviated in this paper as Ln, whereas Ln + Y as REE]. Nine fluorite samples containing from 0 to 18 mol % (REE)F3 were examined by electron microprobe, X-ray powder diffraction, and IR spectroscopy. The crystal structure of natural yttrofluorite has been determined for the first time (R aniso = 1.47 %): Fm3m, a = 5.493 Å; the structural formula is (Ca0.82Y0.12Ln0.06)F2.15. Earlier published and new data show that yttrofluorite containing (REE)F3 > 20 mol % and REE-enriched fluorite with LREE > Y (HREE) are metastable under room conditions. In nature, tveitite-(Y) is a product of solid-state transformation of metastable yttrofluorite with (REE)F3 > 20 mol %. Inferred protophases could have been exsolved into tveitite-(Y) variable in composition or tveitite-(Y) + yttrofluorite stable under normal conditions. The formation of tveitite-(Y) requires the erichment of a protophase not only in Y but also in LREE and HREE as stabilizing admixtures regularly distributed by different types of Ca-dominant structural sites. Tveitite-(Y) and yttrofluorite are geochemical indicators of a medium that is not only enriched in Y, Ln, and F, but also depleted in Na, Ca, CO2 and P.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Moscow, 119991, Russia

    I. V. Pekov & O. V. Yakubovich

  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    N. V. Chukanov

  3. Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    N. N. Kononkova

  4. Fachbereich Chemie, Philipps-Universit@at, Marburg, Germany

    W. Massa

  5. Geological Institute, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, 184209, Russia

    A. V. Voloshin

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  1. I. V. Pekov
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Correspondence to I. V. Pekov.

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Original Russian Text © I.V. Pekov, N.V. Chukanov, N.N. Kononkova, O.V. Yakubovich, W. Massa, A.V. Voloshin, 2009, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2009, Pt. CXXXVII, No. 3, pp. 76–93.

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Pekov, I.V., Chukanov, N.V., Kononkova, N.N. et al. Tveitite-(Y) and REE-enriched fluorite from amazonite pegmatites of the Western Keivy, Kola Peninsula, Russia: Genetic crystal chemistry of natural Ca,REE-fluorides. Geol. Ore Deposits 51, 595–607 (2009). https://doi.org/10.1134/S1075701509070083

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