The crystal structure of betpakdalite, and a new chemical formula:: {Mg(H2O)6}Ca2(H2O)13[Mo6+8As5+2Fe3+3O36(OH)](H2O)4

被引：0
|
作者：
Cooper, MA [1 ]
Hawthorne, FC [1 ]
机构：
[1] Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada
来源：
CANADIAN MINERALOGIST | 1999年 / 37卷
关键词：
betpakdalite; crystal-structure refinement; electron-microprobe analysis; chemical formula;
D O I：
暂无
中图分类号：
P57 [矿物学];
学科分类号：
070901 ;
摘要：
The crystal structure of betpakdalite, monoclinic, C2/m, a 19.531(2), b 11.061(1), c 15.257(2) Angstrom, beta 131.57(1)degrees V 2466.6(5) Angstrom(3), Z = 2, has been refined to an R index of 2.5% for 3077 observed (5 sigma) reflections measured on a single crystal with MoK alpha X-radiation. A crystal fragment was analyzed with an electron microprobe. Compared with previous work, the chemical analysis showed the absence of K and the presence of Mg. Moreover, the site assigned to K in previous work is far more stereochemically compatible with occupancy by Mg. The chemical formula of betpakdalite is redefined as {Mg (H2O)(6)} Ca-2 (H2O)(13) [Mo-8(6+) As-2(5+) Fe-3(3+) O-36 (OH)] (H2O)(4).
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页码：61 / 66
页数：6
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