Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Refinement of the crystal structures of three fluorine-bearing elbaites. / Rozhdestvenskaya, I. V.; Frank-Kamenetskaya, O. V.; Zolotarev, A. A.; Bronzova, Yu M.; Bannova, I. I.
в: Crystallography Reports, Том 50, № 6, 12.12.2005, стр. 907-913.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Refinement of the crystal structures of three fluorine-bearing elbaites
AU - Rozhdestvenskaya, I. V.
AU - Frank-Kamenetskaya, O. V.
AU - Zolotarev, A. A.
AU - Bronzova, Yu M.
AU - Bannova, I. I.
PY - 2005/12/12
Y1 - 2005/12/12
N2 - The crystal structures of three Li-Al natural tourmalines (elbaites) containing 0.88-1.39 wt % F are refined to R = 0.0294, 0.0308, and 0.0417. It is revealed that the W threefold anion site is split into two sites, namely, the W1 threefold site and W2 ninefold site (W1-W2 ∼ 0.4 Å, Y-W1 ≥ 1.94 Å, Y-W2 ≥ 1.75 Å). The following hypothesis is proposed and justified: the W1 and W2 sites are partially occupied by OH groups and fluorine anions, respectively. The ratio of the [YO4(OH) 2] octahedra to the [YO4(OH)F] octahedra depends on the fluorine content and varies from structure to structure. The fact that the W site is more than 50% occupied by fluorine in the structures of two tourmalines under investigation allows the conclusion that fluor-elbaite with the ideal formula Na(Li1.5Al1.5)Al6(Si6O 18)(BO3)3(OH)3F is a new mineral species and that elbaite can be considered a superspecies.
AB - The crystal structures of three Li-Al natural tourmalines (elbaites) containing 0.88-1.39 wt % F are refined to R = 0.0294, 0.0308, and 0.0417. It is revealed that the W threefold anion site is split into two sites, namely, the W1 threefold site and W2 ninefold site (W1-W2 ∼ 0.4 Å, Y-W1 ≥ 1.94 Å, Y-W2 ≥ 1.75 Å). The following hypothesis is proposed and justified: the W1 and W2 sites are partially occupied by OH groups and fluorine anions, respectively. The ratio of the [YO4(OH) 2] octahedra to the [YO4(OH)F] octahedra depends on the fluorine content and varies from structure to structure. The fact that the W site is more than 50% occupied by fluorine in the structures of two tourmalines under investigation allows the conclusion that fluor-elbaite with the ideal formula Na(Li1.5Al1.5)Al6(Si6O 18)(BO3)3(OH)3F is a new mineral species and that elbaite can be considered a superspecies.
UR - http://www.scopus.com/inward/record.url?scp=28444439252&partnerID=8YFLogxK
U2 - 10.1134/1.2132394
DO - 10.1134/1.2132394
M3 - Article
AN - SCOPUS:28444439252
VL - 50
SP - 907
EP - 913
JO - Crystallography Reports
JF - Crystallography Reports
SN - 1063-7745
IS - 6
ER -
ID: 36610709