Structure Solution from X-Ray Powder Diffraction Data of Fluor-Annite <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Structure Solution from X-Ray Powder Diffraction Data of Fluor-Annite

详细信息

责任者：Ruan Qingfeng (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Lu Qi
刊名：Journal of Mineralogy and Petrology
出版年：2009
卷期：29(3)
关键词：云母族 ; mica group ; 新矿物 ; new minerals
页码：p.1-8
图表：5 illus., 5 tables, 12 refs.
分类号：0700
issnNo：ISSN1001-6872
isbnNo：CN51-1143/TD

摘要

///Fluor-annite is a new mineral of trioctahedral mica group, belonging to the F-rich analogue of annite. The crystal structure of fluor-annite has been solved by positive space method from constructed crystal structure model and subsequently refined with the Rietveld technique. The sample used for the structure solution comes from the fluor-annite differentiating at the top of the Suzhou A-type granite located in the western suburb of Suzhou City. The samples were filled in capillary tube and X-ray powder diffraction data were obtained with a super detector in X’, Pert PRO diffractometer. Chemical constituents are calculated by EPMA, wet analysis, atomic absorption spectrometry and mossbauer spectral analysis, and an empirical chemical formula is formulated on the basis of (O+F+OH+Cl)=12 and the assumption that the sum of tetrahedral cation equals 4 is (K_0.92Na_0.03Rb_0.02Ba0.01)_{0. 98}(Fe_1.82²⁺Fe_0.49³⁺A_l0.19Mg_0.18Li_0.16Ti_0.08Mn_0.05Zn_0.02)_2.99(Al_1.17Si_2.83)_4.00O₁₀(F_1.03(OH)_0.50O_0.47)_2.00, with the simplified formula being KFe₃²⁺AlSi₃O₁₀F₂.

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