Lobanovite from the Koashva Mountain in the Kibiny Massif (Kola Peninsula): crystal-chemical features, IR-spectroscopy and mineral assemblage
- Autores: Ilyin G.S.1, Chukanov N.V.2, Lisitsin D.V.3, Varlamov D.A.4, Vaitieva Y.A.1, Britvin S.N.5, Pekov I.V.6, Aksenov S.M.1
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Afiliações:
- Kola Scientific Center RAS
- Center of problems of chemical physics and medical chemistry RAS
- «Gem-stones Museum»
- Institute of experimental mineralogy, named after D.S. Korzhinsky
- Saint-Petersburg State University
- Moscow State University
- Edição: Volume CLIII, Nº 2 (2024)
- Páginas: 89-104
- Seção: NEW MINERALS
- URL: https://bakhtiniada.ru/0869-6055/article/view/263454
- DOI: https://doi.org/10.31857/S0869605524020054
- EDN: https://elibrary.ru/RMRWHL
- ID: 263454
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Resumo
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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Sobre autores
G. Ilyin
Kola Scientific Center RAS
Email: aks.crys@gmail.com
Laboratory of the Arctic mineralogy and material engineering
Rússia, ApatityN. Chukanov
Center of problems of chemical physics and medical chemistry RAS
Email: aks.crys@gmail.com
Rússia, Chernogolovka
D. Lisitsin
«Gem-stones Museum»
Email: aks.crys@gmail.com
Rússia, Moscow
D. Varlamov
Institute of experimental mineralogy, named after D.S. Korzhinsky
Email: aks.crys@gmail.com
Rússia, Chernogolovka
Yu. Vaitieva
Kola Scientific Center RAS
Email: aks.crys@gmail.com
Laboratory of the Arctic mineralogy and material engineering
Rússia, ApatityS. Britvin
Saint-Petersburg State University
Email: aks.crys@gmail.com
Rússia, Saint-Petersburg
I. Pekov
Moscow State University
Email: aks.crys@gmail.com
Геологический факультет
Rússia, MoscowS. Aksenov
Kola Scientific Center RAS; Kola Scientific Center RAS
Autor responsável pela correspondência
Email: aks.crys@gmail.com
Laboratory of the Arctic mineralogy and material engineering,Geological Institute
Rússia, Apatity; ApatityBibliografia
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