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CRYSTALLOCHEMICAL FEATURES OF Ti- AND Sb-RICH NEZILOVITE
- Authors: Rastsvetaeva R.K.1, Gridchina V.M.2, Varlamov D.A.3, Jancev S.4
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Affiliations:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
- Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
- 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://ogarev-online.ru/0023-4761/article/view/137434
- DOI: https://doi.org/10.31857/S0023476123700236
- EDN: https://elibrary.ru/IDHMCY
- ID: 137434
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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.
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About the authors
R. K. Rastsvetaeva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia
Email: rast@crys.ras.ru
Россия, Москва
V. M. Gridchina
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
Email: rast@crys.ras.ru
Россия, Москва
D. A. Varlamov
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
Email: rast@crys.ras.ru
Россия, Черноголовка
S. Jancev
University of Saints Cyril and Methodius, Skopje, Republic of North Macedonia
Author for correspondence.
Email: rast@crys.ras.ru
Республика Северная Македония, Скопье
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