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Natisite, Na2TiSiO5, an Indicator Mineral of Hyperagpaitic Hydrothermal Assemblages in the Lovozero and Khibiny Alkaline Plutons, Kola Peninsula: Occurrence, Crystal Chemistry, and Genetic Features

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Abstract

Natisite, a natural tetragonal (P4/nmm) modification of Na2TiSiO5 = Na2TiO(SiO4) is an abundant indicator mineral of relatively low-temperature (no higher than 300–350°C) peralkaline (hyperagpaitic) hydrothermal assemblages in the Lovozero and Khibiny alkaline plutons, Kola Peninsula, Russia. The proportion of natisite in hypersodic (with Na \( \gg \) K) hydrothermal veins in Lovozero and in the hydrothermally altered zones of potassium-rich pegmatites in Khibiny is up to 30 and 10 vol %, respectively; i.e., natisite can be a rock-forming mineral and the major Ti concentrator in the rock. In Lovozero, natisite is a primary mineral crystallized from hydrothermal solution, whereas in Khibiny, natisite is secondary: it predominantly occurs as pseudomorphs after earlier Ti minerals, namely, ilmenite, titanite, aenigmatite, lamprophyllite and rinkite. The chemical composition of natisite is rather stable, close to Na2TiSiO5. A very bright blue to bluish white fluorescence in shortwave ultraviolet light (λ = 245 nm) is an important identification feature of natisite. The crystal structure of natisite was first solved for a natural sample (Mt. Rasvumchorr, Khibiny), R1 = 1.97%. A comparative study of natisite and other titanosilicates with tetragonal pyramids TiO5 revealed a distinct negative correlation between the length of an essentially covalent Ti–O bond in the titanyl group and the frequency of its stretching vibrations in the IR spectrum.

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Funding

The study was supported by the Russian Foundation for Basic Research (project no. 18-29-12007).

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Authors and Affiliations

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

    I. V. Pekov, N. V. Zubkova, V. O. Yapaskurt, A. G. Turchkova, D. A. Ksenofontov & D. Yu. Pushcharovsky

  2. Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    I. V. Pekov

  3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Oblast, Russia

    N. V. Chukanov

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  1. I. V. Pekov
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Translated by I. Baksheev

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Pekov, I.V., Zubkova, N.V., Chukanov, N.V. et al. Natisite, Na2TiSiO5, an Indicator Mineral of Hyperagpaitic Hydrothermal Assemblages in the Lovozero and Khibiny Alkaline Plutons, Kola Peninsula: Occurrence, Crystal Chemistry, and Genetic Features. Geol. Ore Deposits 64, 452–469 (2022). https://doi.org/10.1134/S1075701522070066

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