Lobanovite from the Koashva Mountain in the Kibiny Massif (Kola Peninsula): crystal-chemical features, IR-spectroscopy and mineral assemblage

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Abstract

Lobanovite from the Koashva mountain in the Kibiny massif (Kola Peninsula) has been studied by methods of X-ray-spectral microanalysis, monocrystal X-ray diffractometry and IR-spectroscopy. Parameters of the lobanovite monoclinic unit cell: a = 5.3329(1), b = 23.1500(5), c = 10.3844(2) Å, β = 99.640(2)°, V = 1263.92(4) Å3; space group C2/m; crystal structure was refined to R = 2.8% with use of 1918 reflections with I > 3σ(I).

Crystal-chemical formula is as following (Z = 2): A(K0.93Ba0.01□0.06)2 B(Na0.95Ca0.05) [M1Na M2 (Mn0.445Fe2+0.275Na0.115Fe3+0.1Ca0.065)2 M3(Fe2+0.525Mg0.375Fe3+0.1)2 M4(Mg0.57Fe2+0.33Fe3+0.1)2 (OH)4] [D(Ti0.885Fe3+0.09Nb0.025)O(Si4O12)(ОН)0.1]2. In general, the studied sample of lobanovite is close to previously described ones, but it characterized by supplementary splitting in several bands if IR-spectrum. In D-position, together with titanium, there were for the first time revealed admixtures of iron and niobium, and in the inter-packet spаce – the partial replacement of sodium and potassium cations by barium and calcium. These facts were not mentioned in earlier publications. The article displays also some chemical and IR-spectroscopic data about {-ray-amorphous karnasurtite-like silicate and a rare-earths phosphate associated with lobanovite.

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About the authors

G. S. Ilyin

Kola Scientific Center RAS

Email: aks.crys@gmail.com

Laboratory of the Arctic mineralogy and material engineering

Russian Federation, Apatity

N. V. Chukanov

Center of problems of chemical physics and medical chemistry RAS

Email: aks.crys@gmail.com
Russian Federation, Chernogolovka

D. V. Lisitsin

«Gem-stones Museum»

Email: aks.crys@gmail.com
Russian Federation, Moscow

D. A. Varlamov

Institute of experimental mineralogy, named after D.S. Korzhinsky

Email: aks.crys@gmail.com
Russian Federation, Chernogolovka

Yu. A. Vaitieva

Kola Scientific Center RAS

Email: aks.crys@gmail.com

Laboratory of the Arctic mineralogy and material engineering

Russian Federation, Apatity

S. N. Britvin

Saint-Petersburg State University

Email: aks.crys@gmail.com
Russian Federation, Saint-Petersburg

I. V. Pekov

Moscow State University

Email: aks.crys@gmail.com

Геологический факультет

Russian Federation, Moscow

S. M. Aksenov

Kola Scientific Center RAS; Kola Scientific Center RAS

Author for correspondence.
Email: aks.crys@gmail.com

Laboratory of the Arctic mineralogy and material engineering,Geological Institute

Russian Federation, Apatity; Apatity

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Supplementary files

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2. Fig. 1. A sample of lobanovite, found, according to the preserved label, in 1933 in the Fersman Gorge (modern name: Shchel Pass), Khibiny.

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3. Fig. 2. Aggregate of lobanovite crystals with inclusions of fluorapatite (Fap) and pyrrhotite (Pyh).

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4. Fig. 3. Polymineral aggregate composed of rare-earth mineral phases 1 and 2 and fluorapatite (Fap).

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5. Fig. 4. IR spectra of lobanovite from Koashva Mt. studied in this work (upper curve) and typical lobanovite from Kukisvumckorr Mt., Khibiny Massif (lower curve).

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6. Fig. 5. IR spectra of two fragments of the polymineral pseudomorph after an unidentified mineral associated with lobanovite (1, 2) and of karnasurtite-(Ce) from its type locality, pegmatite #62, Karnasurt Mt., Lovozero massif, Kola Peninsula (Semenov, 1972) (3).

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7. Fig. 6. General view of the crystal structure of lobanovite.

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8. Fig. 7. A three-layer HOH module in the structure of lobanovite.

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9. Fig. 8. Statistical connection of neighboring three-layer HOH modules via a common OH group in lobanovite from Koashva Mt.

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