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Yegorovite, Na4[Si4O8(OH)4]·7H2O, a new mineral from the Lovozero alkaline pluton, Kola Peninsula

  • New Minerals, Nomenclature, and Classification
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Abstract

A new mineral, yegorovite, has been identified in the late hydrothermal, low-temperature assemblage of the Palitra hyperalkaline pegmatite at Mt. Kedykverpakhk, Lovozero alkaline pluton, Kola Peninsula, Russia. The mineral is intimately associated with revdite and megacyclite, earlier natrosilite, microcline, and villiaumite. Yegorovite occurs as coarse, usually split prismatic (up to 0.05 × 0.15 × 1 mm) or lamellar (up to 0.05 × 0.7 × 0.8 mm) crystals. Polysynthetic twins and parallel intergrowths are typical. Mineral individuals are combined in bunches or chaotic groups (up to 2 mm); radial-lamellar clusters are less frequent. Yegorovite is colorless, transparent with vitreous luster. Cleavage is perfect parallel to (010) and (001). Fracture is splintery; crystals are readily split into acicular fragments. The Mohs hardness is ∼2. Density is 1.90(2) g/cm3 (meas) and 1.92 g/cm3 (calc). Yegorovite is biaxial (−), with α = 1.474(2), β = 1.479(2), and γ = 1.482(2), 2V meas > 70°, 2V calc = 75°. The optical orientation is X ∧ a ∼ 15°, Y = c, Z = b. The IR spectrum is given. The chemical composition determined using an electron microprobe (H2O determined from total deficiency) is (wt %): 23.28 Na2O, 45.45 SiO2, 31.27 H2Ocalc; the total is 100.00. The empirical formula is Na3.98Si4.01O8.02(OH)3.98 · 7.205H2O. The idealized formula is Na4[Si4O8(OH)4] · 7H2O. Yegorovite is monoclinic, space group P21/c. The unit-cell dimensions are a = 9.874, b= 12.398, c = 14.897 Å, β = 104.68°, V = 1764.3 Å3, Z = 4. The strongest reflections in the X-ray powder pattern (d, Å (I, %)([hkl]) are 7.21(70)[002], 6.21(72)[012, 020], 4.696(44)[022], 4.003(49)[211], 3.734(46)[\( \bar 2 \) 13], 3.116(100)[024, 040], 2.463(38)[\( \bar 4 \)02, \( \bar 2 \)43]. The crystal structure was studied by single-crystal method, R hkl = 0.0745. Yegorovite is a representative of a new structural type. Its structure consists of single chains of Si tetrahedrons [Si4O8(OH)4]∞ and sixfold polyhedrons of two types: [NaO(OH)2(H2O)3] and [NaO(OH)(H2O)4] centered by Na. The mineral was named in memory of Yu. K. Yegorov-Tismenko (1938–2007), outstanding Russian crystallographer and crystallochemist. The type material of yegorovite has been deposited at the Fersman Mineralogical Museum of Russian Academy of Sciences, Moscow.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, 119899, Moscow, Russia

    I. V. Pekov, N. V. Zubkova & D. Yu. Pushcharovsky

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

    N. V. Chukanov

  3. NPP Teplokhim, Dmitrovskoe shosse 71, Moscow, 127238, Russia

    A. E. Zadov

  4. OAO Lovozersky GOK, Revda, Murmansk oblast, 184291, Russia

    V. G. Grishin

Authors
  1. I. V. Pekov
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  2. N. V. Zubkova
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  3. N. V. Chukanov
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  4. A. E. Zadov
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  5. V. G. Grishin
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  6. D. Yu. Pushcharovsky
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Correspondence to I. V. Pekov.

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Original Russian Text © I.V. Pekov, N.V. Zubkova, N.V. Chukanov, A.E. Zadov, V.G. Grishin, D.Yu. Pushcharovsky, 2009, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2009, No. 3, pp. 82–89.

Considered and recommended by the Commission on New Minerals and Mineral Names, Russian Mineralogical Society June 26, 2008. Approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association October 6, 2008 (IMA no. 2008-033).

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Pekov, I.V., Zubkova, N.V., Chukanov, N.V. et al. Yegorovite, Na4[Si4O8(OH)4]·7H2O, a new mineral from the Lovozero alkaline pluton, Kola Peninsula. Geol. Ore Deposits 52, 584–590 (2010). https://doi.org/10.1134/S107570151007007X

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