Refinement of the crystal structure of berezanskite, Ti2□2KLi3(Si12O30)

被引：3
作者：
Hawthorne, F. C. [1 ]
Sokolova, E. [1 ]
Pautov, L. A. [2 ]
Agakhanov, A. A. [2 ]
Karpenko, V. Yu. [2 ]
机构：
[1] Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada
[2] Russian Acad Sci, Fersman Mineral Museum, Leninskii Prospect 18-2, Moscow 117071, Russia
来源：
MINERALOGICAL MAGAZINE | 2016年 / 80卷 / 05期
基金：
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词：
berezanskite; milarite group; Darai-Pioz; Tajikistan; crystal structure; electron microprobe analysis; BEARING MINERALS; CHEMISTRY;
D O I：
10.1180/minmag.2016.080.022
中图分类号：
P57 [矿物学];
学科分类号：
070901 ;
摘要：
Berezanskite, ideally Ti-2 square 2KLi3(Si12O30), is hexagonal, space group P6/mcc, a = 9.898(4), c = 14.276(6) angstrom, V = 1211.2(9) angstrom(3), Z = 2. The crystal structure was refined to an R-1 index of 2.08% based on 392 unique observed reflections. Berezanskite is isostructural with milarite, ideally (A)Ca(2)(B)o(C)K(T(2))(Be2Al)((Si12O30)-Si-T(1))(H2O)(0-2). The structural unit is of the form[T(2)(3)T(1)(12)O-30] with T(1) = Si and T(2) = Li, inwhich (LiO4) tetrahedra link [Si12O30] six-membered double-rings into a framework. The A, B and C sites occur in the interstices of the framework with the following site populations: A = Ti-2(4+), <A-O> = 1.938(2) angstrom; B = square(2); C = K,<C-O> = 3.058(2) angstrom. In the T(2) = Li-3 milarite-group minerals, the <C-O> distance is inversely related to the occupancy of the B site.
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页码：733 / 737
页数：5
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