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Crystallochemical Features of Ti- and Sb-Rich Nezilovite

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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\(_{{0.4}}^{{5 + }}\))Mn\(_{2}^{{3 + }}\)Fe\(_{6}^{{3 + }}\)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.

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ACKNOWLEDGMENTS

We are grateful to N.V. Chukanov for supplying crystals and participation in the discussion of the results.

Funding

The study was performed using equipment of the Shared Research Center of the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences within the State assignment of the Ministry of Science and Higher Education of the Russian Federation for the FSRC “Crystallography and Photonics” RAS.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia

    R. K. Rastsvetaeva & V. M. Gridchina

  2. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    D. A. Varlamov

  3. University of Saints Cyril and Methodius, Skopje, Republic of North Macedonia

    S. Jancev

Authors
  1. R. K. Rastsvetaeva
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  2. V. M. Gridchina
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  3. D. A. Varlamov
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  4. S. Jancev
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Correspondence to R. K. Rastsvetaeva.

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The authors declare that they have no conflicts of interest.

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Translated by Yu. Sin’kov

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Rastsvetaeva, R.K., Gridchina, V.M., Varlamov, D.A. et al. Crystallochemical Features of Ti- and Sb-Rich Nezilovite. Crystallogr. Rep. 68, 575–580 (2023). https://doi.org/10.1134/S1063774523700256

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  • DOI: https://doi.org/10.1134/S1063774523700256

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