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Your search keyword '"Rusakov, Vyacheslav"' showing total 3 results
Start Over Author "Rusakov, Vyacheslav" Topic crystal chemistry
3 results on '"Rusakov, Vyacheslav"'

1. Insights into crystal chemistry of the vesuvianite-group: manaevite-(Ce), a new mineral with complex mechanisms of its hydration

Author

Moiseev, Mikhail M., Panikorovskii, Taras L., Aksenov, Sergey M., Mazur, Anton S., Mikhailova, Julia A., Yakovenchuk, Victor N., Bazai, Ayya V., Ivanyuk, Gregory Yu., Agakhanov, Atali A., Shilovskikh, Vladimir V., Pekov, Igor V., Kasatkin, Anatoly V., Rusakov, Vyacheslav S., Yapaskurt, Vasiliy O., Karpenko, Vladimir Yu., and Krivovichev, Sergey V.

Published
2020
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3. Towards a revisitation of vesuvianite-group nomenclature: the crystal structure of Ti-rich vesuvianite from Alchuri, Shigar Valley, Pakistan.

Author

Aksenov, Sergey M., Chukanov, Nikita V., Rusakov, Vyacheslav S., Panikorovskii, Taras L., Rastsvetaeva, Ramiza K., Gainov, Ramil R., Vagizov, Farit G., Lyssenko, Konstantin A., and Belakovskiy, Dmitry I.

Subjects
VESUVIANITE, CRYSTAL structure, ELECTRON probe microanalysis
Abstract

Vesuvianite containing 5.85 wt% TiO2 from an Alpine-cleft-type assemblage outcropped near Alchuri, Shigar Valley, Northern Areas, Pakistan, has been investigated by means of electron microprobe analyses, gas-chromatographic analysis of H2O, X-ray powder diffraction, single-crystal X-ray structure refinement, 27Al NMR, 57Fe Mössbauer spectroscopy, IR spectroscopy and optical measurements. Tetragonal unit-cell parameters are: a = 15.5326 (2), c = 11.8040 (2) Å , space group P4/nnc. The structure was refined to final R1 = 0.031, wR2 = 0.057 for 11247 I > 2σ(I). A general crystal-chemical formula of studied sample can be written as follows (Z = 2): [8-9](Ca17.1Na0.9) [8]Ca1.0 [5](Fe2+0.44Fe3+0.34Mg0.22) [6](Al3.59Mg0.41) [6](Al4.03Ti2.20Fe3+1.37Fe2+0.40) (Si18O68) [(OH)5.84O2.83F1.33]. The octahedral site Y2 is Al-dominant and does not contain transition elements. Another octahedral site Y3 is also Al-dominant and contains Fe2+, Fe3+ and Ti. The site Y1 is split into Y1a and Y1b predominantly occupied by Fe2+ and Fe3+, respectively. The role of the Y1 site in the diversity of vesuvianite-group minerals is discussed. [ABSTRACT FROM AUTHOR]

Published
2016
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