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Geology of Ore Deposits

, Volume 59, Issue 7, pp 592–600 | Cite as

Ilyukhinite (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2 ∙ 3H2O, a New Mineral of the Eudialyte Group

  • N. V. Chukanov
  • R. K. Rastsvetaeva
  • K. A. Rozenberg
  • S. M. Aksenov
  • I. V. Pekov
  • D. I. Belakovsky
  • R. Kristiansen
  • K. V. Van
New Minerals

Abstract

A new eudialyte-group mineral, ilyukhinite, ideally (H3O,Na)14Ca6Mn2Zr3Si26O72(OH)2 · 3H2O, has been found in peralkaline pegmatite at Mt. Kukisvumchorr, Khibiny alkaline pluton, Kola Peninsula, Russia. It occurs as brownish orange, with vitreous luster anhedral grains up to 1 mm across in hydrothermally altered peralkaline rock, in association with aegirine, murmanite, albite, microcline, rhabdophane-(Ce), fluorite, sphalerite and molybdenite. The Mohs hardness is 5; cleavage is not observed. Dmeas 2.67(2), Dcalc 2.703 g/cm3. Ilyukhinite is optically uniaxial (–): ω = 1.585(2), ε = 1.584(2). The IR spectrum is given. The average chemical composition of ilyukhinite (wt %; electron microprobe, ranges given in parentheses; H2O determined by gas chromatography) is as follows: 3.07 (3.63–4.43) Na2О, 0.32 (0.28–0.52) K2O, 10.63 (10.26–10.90) CaO, 3.06 (2.74–3.22) MnO, 1.15 (0.93–1.37) FeO, 0.79 (0.51–0.89) La2O3, 1.21 (0.97–1.44) Ce2O3, 0.41 (0.30–0.56) Nd2O3, 0.90 (0.77–1.12) TiO2, 10.94 (10.15–11.21) ZrO2, 1.40 (0.76–1.68) Nb2O5, 51.24 (49.98–52.28) SiO2, 1.14 (0.89–1.37) SO3, 0.27 (0.19—0.38) Cl, 10.9(5 )H2O,–0.06–O = C1, total is 98.27. The empirical formula is H36.04(Na3.82K0.20)(Ca5.65Ce0.22La0.14Nd0.07)(Mn1.285Fe0.48)(Zr2.645Ti0.34)Nb0.31Si25.41S0.42Cl0.23O86.82. The crystal structure has been solved (R = 0.046). Ilyukhinite is trigonal, R3m; a = 14.1695(6) Å, b = 31.026(1) Å, V = 5394.7(7) Å3, Z = 3. The strongest XRD reflections [d, Å (I, %) (hkl)] are 11.44 (82) (101), 7.09 (70) (110), 6.02 (44) (021), 4.371 (89) 205), 3.805 (47) (303, 033), 3.376 (41) (131), 2.985 (100) (315, 128), 2.852 (92) (404). Ilyukhinite was named in memory of Vladimir V. Ilyukhin (1934–1982), an outstanding Soviet crystallographer. The type specimen of ilyukhinite has been deposited in the collection of the Natural History Museum, University of Oslo, Norway.

Keywords

ilyukhinite new mineral eudialyte group zitconium peralkaline pegmatite Kukisvumchorr Khibiny alkaline massif 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • N. V. Chukanov
    • 1
    • 2
  • R. K. Rastsvetaeva
    • 3
  • K. A. Rozenberg
    • 3
  • S. M. Aksenov
    • 3
    • 4
  • I. V. Pekov
    • 2
  • D. I. Belakovsky
    • 5
  • R. Kristiansen
    • 6
  • K. V. Van
    • 7
  1. 1.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  2. 2.Geological FacultyMoscow State UniversityMoscowRussia
  3. 3.Institute of CrystallographyRussian Academy of SciencesMoscowRussia
  4. 4.Institute of GeosciencesSt. Petersburg State UniversitySt. PetersburgRussia
  5. 5.Fersman Mineralogical MuseumRussian Academy of SciencesMoscowRussia
  6. 6.SellebakkNorway
  7. 7.Institute of Experimental MineralogyRussian Academy of SciencesChernogolovka, Moscow oblastRussia

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