New Data on the Isomorphism in Eudialyte-Group Minerals. IХ: Blocky Isomorphism at Key Sites. Crystal Structure of Fe-Deficient Eudialyte from the Khibiny Massif

Autor:	Nikita V. Chukanov, Ramiza K. Rastsvetaeva, D. V. Lisitsin
Rok vydání:	2021
Předmět:	Materials science Mineral Coordination number Isomorphism (crystallography) Infrared spectroscopy Eudialyte General Chemistry Crystal structure engineering.material Condensed Matter Physics Block (periodic table) Crystallography Group (periodic table) engineering General Materials Science
Zdroj:	Crystallography Reports. 66:112-119
ISSN:	1562-689X 1063-7745
DOI:	10.1134/s1063774521010156
Popis:	The crystal structure and crystallochemical features of Fe-deficient manganese-rich eudialyte from the Khibiny massif (Kola Peninsula) have been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigonal unit-cell parameters of the mineral are found to be a = 14.199(1) A, c = 30.305(1) A, and V = 5291.2(2) A3; sp. gr. R3m. The crystal structure is refined to the final reliability factor R = 4.46% in the anisotropic approximation of atomic displacements, using 1937 reflections with F > 3σ(F). The idealized crystallochemical formula of the mineral (Z = 3, Roman numerals indicate the coordination numbers (CNs) of cations in the key sites) is N1–5(Na,H3O) $$_{{15}}^{{{\text{V}}-{\text{X}}}}$$ M1(Ca,Mn) $$_{6}^{{{\text{VI}}}}$$ M2(FeIV,NaVI,NaV,MnVII,MnV)3 M3(SiIV,NbVI) M4SiIV Z(Zr,Ti) $$_{3}^{{{\text{VI}}}}$$ [Si24O72] (OH,Cl,SO4)3 (H2O,OH) ⋅ 1.5H2O. The regularities of block isomorphism in eudialyte-group minerals are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::86dbe91cc008a88b50c9a1fa4b7011b9 https://doi.org/10.1134/s1063774521010156 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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