Crystal structure refinement of pseudojohannite, Cu3(OH)2 [(UO2)4O4 (SO4)2](H2O)12, from the type locality - Jachymov, Czech Republic

被引：5

作者：

Plasil, Jakub ^{[1
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Vvi, Prague 18221 8, Czech Republic

来源：

JOURNAL OF GEOSCIENCES | 2015年 / 60卷 / 02期

关键词：

pseudojohannite; uranyl sulphate; zippetite group; crystal structure; Jachymov; STRUCTURE VALIDATION; ZIPPEITE; MINERALS; MEMBER;

D O I：

10.3190/jgeosci.190

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The crystal structure of pseudojohannite from the type locality, Jachymov (Western Bohemia, Czech Republic), was solved by charge-flipping method from single-crystal X-ray diffraction data and refined to an R = 0.0385 against 2072 unique observed reflections. Pseudojohannite from Jachymov is triclinic, P (1) over bar, with a = 8.6653(4), b = 8.8499(5) angstrom, c = 9.9908(6), alpha = 72.103(6), beta = 70.512(5)degrees, gamma = 76.070(5)degrees, V = 679.12(7) angstrom(3) and Z = 1. The structural formula derived from the refinement and bond-valence considerations is Cu-3(OH)(2) [(UO2)(4)O-4 (SO4)(2)](H2O)(12), confirming previous structure determination on the material from Widowmaker mine, Utah, USA. Contrary to other members of the zippeite-group, the interstitial metal sites in pseudojohannite (populated by Cu2+), are fully occupied and the structure tends to be fully ordered with no important departure from the ideal stoichiometry.

引用

页码：123 / 127

页数：5

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