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Title: Refinement of the crystal structure of lithium-bearing uvite

Abstract

The crystal structure of a natural calcium tourmaline, i.e., uvite with a high lithium content (0.51 au per formula (aupf) at the Y site, is refined to R = 0.019, R{sub w} = 0.020, and S = 1.11. It is shown that, in nature, there exist uvites in which the charge balance in the case where the Z site is occupied by trivalent cations is provided by the replacement of part of the divalent magnesium cations at the Y site by univalent cations, divalent calcium cations at the X site by sodium cations, and univalent anions at the W site by oxygen anions. The W site is found to be split into two sites, namely, the W1 and W11 sites (the W1-W11 distance is 0.14 A), which are partially occupied by the fluorine and oxygen anions, respectively. An analysis of the results obtained in this study and the data available in the literature on the crystal structure of uvites allows the conclusion that uvite can be considered a superspecies and that the nomenclature of this mineral group needs refinement with the use of structural data.

Authors:
;  [1];  [2]; ;  [1]
  1. St. Petersburg State University, Department of Crystallography (Russian Federation)
  2. Russian Academy of Sciences, Vinogradov Institute of Geochemistry, Siberian Division (Russian Federation)
Publication Date:
OSTI Identifier:
21090955
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 52; Journal Issue: 2; Other Information: DOI: 10.1134/S106377450702006X; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANIONS; CALCIUM COMPOUNDS; CATIONS; CRYSTAL STRUCTURE; LITHIUM COMPOUNDS; MAGNESIUM COMPOUNDS; SODIUM COMPOUNDS; TOURMALINE

Citation Formats

Rozhdestvenskaya, I. V., E-mail: ivrozhdestvenska@mail.ru, Frank-Kamenetskaya, O. V., Kuznetsova, L. G., Bannova, I. I., and Bronzova, Yu. M.. Refinement of the crystal structure of lithium-bearing uvite. United States: N. p., 2007. Web. doi:10.1134/S106377450702006X.
Rozhdestvenskaya, I. V., E-mail: ivrozhdestvenska@mail.ru, Frank-Kamenetskaya, O. V., Kuznetsova, L. G., Bannova, I. I., & Bronzova, Yu. M.. Refinement of the crystal structure of lithium-bearing uvite. United States. doi:10.1134/S106377450702006X.
Rozhdestvenskaya, I. V., E-mail: ivrozhdestvenska@mail.ru, Frank-Kamenetskaya, O. V., Kuznetsova, L. G., Bannova, I. I., and Bronzova, Yu. M.. Thu . "Refinement of the crystal structure of lithium-bearing uvite". United States. doi:10.1134/S106377450702006X.
@article{osti_21090955,
title = {Refinement of the crystal structure of lithium-bearing uvite},
author = {Rozhdestvenskaya, I. V., E-mail: ivrozhdestvenska@mail.ru and Frank-Kamenetskaya, O. V. and Kuznetsova, L. G. and Bannova, I. I. and Bronzova, Yu. M.},
abstractNote = {The crystal structure of a natural calcium tourmaline, i.e., uvite with a high lithium content (0.51 au per formula (aupf) at the Y site, is refined to R = 0.019, R{sub w} = 0.020, and S = 1.11. It is shown that, in nature, there exist uvites in which the charge balance in the case where the Z site is occupied by trivalent cations is provided by the replacement of part of the divalent magnesium cations at the Y site by univalent cations, divalent calcium cations at the X site by sodium cations, and univalent anions at the W site by oxygen anions. The W site is found to be split into two sites, namely, the W1 and W11 sites (the W1-W11 distance is 0.14 A), which are partially occupied by the fluorine and oxygen anions, respectively. An analysis of the results obtained in this study and the data available in the literature on the crystal structure of uvites allows the conclusion that uvite can be considered a superspecies and that the nomenclature of this mineral group needs refinement with the use of structural data.},
doi = {10.1134/S106377450702006X},
journal = {Crystallography Reports},
number = 2,
volume = 52,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}