CRYSTALLOCHEMICAL FEATURES OF Ti- AND Sb-RICH NEZILOVITE

R. K. Rastsvetaeva; Расцветаева Р. К.; V. M. Gridchina; Гридчина В. М.; D. A. Varlamov; Варламов Д. А.; S. Jancev; Янчев С.

doi:10.31857/S0023476123700236

CRYSTALLOCHEMICAL FEATURES OF Ti- AND Sb-RICH NEZILOVITE

Authors: Rastsvetaeva R.K.¹, Gridchina V.M.², Varlamov D.A.³, Jancev S.⁴
Affiliations:
1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia
2. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
3. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
4. University of Saints Cyril and Methodius, Skopje, Republic of North Macedonia
Issue: Vol 68, No 4 (2023)
Pages: 575-580
Section: СТРУКТУРА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://rjsvd.com/0023-4761/article/view/673393
DOI: https://doi.org/10.31857/S0023476123700236
EDN: https://elibrary.ru/IDHMCY
ID: 673393

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Abstract

A variety of the mineral nezilovite, containing antimony and an elevated amount of titanium, has been studied using microprobe and X-ray diffraction analysis. The diffraction experiment was performed on a crystal presenting an aggregate of nezilovite and högbomite with close unit-cell parameters. The parameters of the hexagonal cell of the nezilovite studied are a = 5.8855(2) Å, c = 23.092(1) Å, V = 692.73 (4) Å3,sp. gr. P6₃/mmc. The structural model is refined using a limited number of unique reflections 231F > 4σ(F) to R = 0.08. The crystallochemical formula is (Z = 2) PbZn2(Ti0.9Al0.1)(Al0.6Sb )Mn Fe O18.5(O,OH)0.5. The distribution of cations of this composition over structure sites is established. A basis of the mineral structure is a set of spinel layers, consisting of edge-sharing Fe³⁺ octahedra. They alternate with two heteropolyhedral layers: Zn tetrahedra combine (Al,Sb) octahedra in one layer, and five-vertex Ti polyhedra combine dimers of Mn³⁺ octahedra in the other layer.

Keywords

CRYSTALLOCHEMICAL FEATURES, NEZILOVITE

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