Selivanovaite, NaTi3(Ti, Na, Fe, Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, is a new titanosilicate of the murmanite group (seidozerite supergroup). It is triclinic, P, a = 8.673(5), b = 8.694(3), c = 12.21(1) Å, α = 92.70(5), β = 108.46(7), γ = 105.40(4)°, V = 833(1) Å3, Z = 2 (from single-crystal diffraction data); a = 8.673(5), b = 8.694(1), c = 12.21(1) Å, α = 92.70(5), β = 108.52(1), γ = 105.42(1)°, V = 833(1) Å3, Z = 2 (from powder diffraction data). The mineral was found in drill cores of medium-grained trachytoid eudialyte-rich malignite of the Lovozero eudyalite complex at Mt. Alluaiv, at the horizon 900–1000 m above the Baltic Sea level. The rock consists mainly of euhedral microcline-perthite, nepheline and manganoeudialyte crystals cemented by fine-acicular aegirine. Minor rock-forming minerals include sodalite, natrolite, magnesioarfvedsonite, and selivanovaite (up to 10 modal %). Characteristic accessory minerals are lamprophyllite, murmanite, loparite-(Ce), a pyrochlore-group mineral, thorite, anatase, baryte, rhabdophane-(Ce), pyrrhotite, chalcopyrite, pyrite, chlorbartonite, djerfisherite, sphalerite, and löllingite. Selivanovaite forms platy metacrysts (up to 8 mm in diameter) with numerous poikilitic inclusions of aegirine and magnesioarfvedsonite. It is dark-orange, with a vitreous lustre and a brownish-white streak. The cleavage is perfect on {0 0 1} and weak on {1 1 0}, the fracture is stepped. Mohs hardness is 3. In transmitted light, the mineral is brown; pleochroism and dispersion were not observed. Selivanovaite is biaxial (+), α 1.79(1), β 1.81(1), γ 1.87(1) (589 nm), 2Vmeas = 40(5)°, 2Vcalc = 57.3°. The optical orientation is Z^c = 5–10°. The calculated and measured densities are 3.34 and 3.15(3) g cm−3, respectively. The mean chemical composition determined by electron microprobe is: Na2O 5.45, MgO 0.59, Al2O3 0.04, SiO2 25.55, K2O 0.63, CaO 1.68, TiO2 31.17, MnO 2.64, FeO 6.63, ZrO2 2.31, Nb2O5 6.69, with H2O 17.0 wt% (determined by the Penfield method), giving a total of 100.38 wt%. The empirical formula calculated on the basis of Si = 4 atoms per formula unit (apfu) is (Na1.65Mn0.35Ca0.28Zr0.18Mg0.14K0.13)Σ2.73(Ti3.67Nb0.47Al0.01)Σ4.93[Si4O19.72] 8.87H2O. The simplified formula based upon the crystal-structure refinement is NaTi3(TiNaFeMn0.5□0.50)Σ4[(Si2O7)2O4(OH)2(H2O)2] nH2O or, taking into account chemical variations, NaTi3(Ti, Na, Fe, Mn)4[(Si2O7)2O4(OH,H2O)4] nH2O. The mineral slowly dissolves in cold 10% HCl. The strongest X-ray powder-diffraction lines [listed as d in Å (I) (hkl)] are: 11.43(1 0 0)(0 0 1), 6.37(25)(−1 1 1), 5.73(15)(0 0 2), 4.208(16)(−2 1 1), 3.108(35)(2 −2 1), 3.043(20)(−1 0 4), and 2.596(17)(0 1 4). The crystal structure of selivanovaite is closely related to those of murmanite-group minerals and consists of the HOH-layers with the composition [N2M5Si4O18(OH)3] (M = Ti, Nb, Fe and Mn, N = Na, K, Ca, Mn, Mg and Zr) connected by additional N-octahedra with H2O molecules between them. The mineral is named in honour of Dr. Ekaterina A. Selivanova (b. 1967), from the Kola Science Centre of the Russian Academy of Sciences, for her contribution to the mineralogy of alkaline complexes.
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Research Article|
May 01, 2018
Selivanovaite, NaTi3(Ti,Na,Fe,Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, a new rock-forming mineral from the eudialyte-rich malignite of the Lovozero alkaline massif (Kola Peninsula, Russia)
Yakov A. Pakhomovsky;
Yakov A. Pakhomovsky
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
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Taras L. Panikorovskii;
Taras L. Panikorovskii
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
2
Department of Crystallography, Institute of Earth Sciences, Saint-Petersburg State University
, University Emb. 7/9, 199034St. Petersburg, Russia
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Victor N. Yakovenchuk;
Victor N. Yakovenchuk
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
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Gregory Yu. Ivanyuk;
Gregory Yu. Ivanyuk
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
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Julia A. Mikhailova;
Julia A. Mikhailova
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
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Sergey V. Krivovichev;
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
2
Department of Crystallography, Institute of Earth Sciences, Saint-Petersburg State University
, University Emb. 7/9, 199034St. Petersburg, Russia
Corresponding author, e-mail: s.krivovichev@spbu.ru
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Vladimir N. Bocharov;
Vladimir N. Bocharov
3
Geo Environmental Centre “Geomodel”, Saint-Petersburg State University
, Ul'yanovskaya Str. 1, St. Petersburg198504, Russia
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Andrei O. Kalashnikov
Andrei O. Kalashnikov
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
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Yakov A. Pakhomovsky
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
Taras L. Panikorovskii
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
2
Department of Crystallography, Institute of Earth Sciences, Saint-Petersburg State University
, University Emb. 7/9, 199034St. Petersburg, Russia
Victor N. Yakovenchuk
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
Gregory Yu. Ivanyuk
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
Julia A. Mikhailova
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
2
Department of Crystallography, Institute of Earth Sciences, Saint-Petersburg State University
, University Emb. 7/9, 199034St. Petersburg, Russia
Vladimir N. Bocharov
3
Geo Environmental Centre “Geomodel”, Saint-Petersburg State University
, Ul'yanovskaya Str. 1, St. Petersburg198504, Russia
Andrei O. Kalashnikov
1
Kola Science Centre, Russian Academy of Sciences
, 14 Fersman Street, Apatity184200, Russia
Corresponding author, e-mail: s.krivovichev@spbu.ru
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
14 Aug 2017
Revision Received:
20 Oct 2017
Accepted:
31 Oct 2017
First Online:
01 Jun 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (3): 525–535.
Article history
Received:
14 Aug 2017
Revision Received:
20 Oct 2017
Accepted:
31 Oct 2017
First Online:
01 Jun 2018
Citation
Yakov A. Pakhomovsky, Taras L. Panikorovskii, Victor N. Yakovenchuk, Gregory Yu. Ivanyuk, Julia A. Mikhailova, Sergey V. Krivovichev, Vladimir N. Bocharov, Andrei O. Kalashnikov; Selivanovaite, NaTi3(Ti,Na,Fe,Mn)4[(Si2O7)2O4(OH,H2O)4]·nH2O, a new rock-forming mineral from the eudialyte-rich malignite of the Lovozero alkaline massif (Kola Peninsula, Russia). European Journal of Mineralogy 2018;; 30 (3): 525–535. doi: https://doi.org/10.1127/ejm/2018/0030-2740
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Index Terms/Descriptors
- cell dimensions
- chemical composition
- chlorides
- Commonwealth of Independent States
- crystal form
- crystal structure
- crystal systems
- electron probe data
- eudialyte
- Europe
- halides
- igneous rocks
- Lovozero Massif
- Murmansk Russian Federation
- nepheline syenite
- new minerals
- optical properties
- physical properties
- plutonic rocks
- Raman spectra
- ring silicates
- Russian Federation
- silicates
- spectra
- syenites
- triclinic system
- X-ray diffraction data
- malignite
- titanosilicates
- Mount Alluaiv
- selivanovaite
- seidozerite supergroup
- murmanite group
Latitude & Longitude
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