Kenoargentotetrahedrite-(Zn),[Ag6]4+(Cu4Zn2)Sb4S12□,来自中国银洞坡金矿床的四面体矿群新成员

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Kai Qu, Xianzhang Sima, Xiangping Gu, Weizhi Sun, Guang Fan, Zeqiang Yang, Yanjuan Wang
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引用次数: 0

摘要

摘要。在中国河南省银洞坡金矿床发现了新矿物kenoargentotetrahedrite-(Zn),即[Ag6]4+(Cu4Zn2)Sb4S12□。它呈黑色金属正方体晶粒或等轴晶粒,大小可达 40 µm。它在透射光下不透明,在反射光下呈青灰色。对所研究材料进行的电子微探针分析得出了经验公式(根据阳离子总数等于每式单位 16 个原子,apfu):M(2)(Ag3.Ag3.Ag3.Ag3.Ag4)M(2)(Ag3.75Cu2.25)Σ6M(1)[Cu3.90(Zn1.18Fe0.69Cd0.26)Σ2.13]Σ6.03X(3)(Sb3.69As0.27)Σ3.96S(1)S11.94 S(2)□.Kenoargentotetrahedrite-(Zn)呈立方体,I4‾3m(编号 217),a=10.4624(4)埃,V=1145.23(13)埃3,Z=2。利用单晶 X 射线衍射数据,在 274 个独立反射(Fo > 4σ (Fo))的基础上,将晶体结构细化为最终值 R1= 0.0247。七条最强的 X 射线粉末衍射线(d 单位为 Å (I) (hkl))如下:3.010 (100) (222)、1.844 (30) (044)、2.606 (22) (004)、1.572 (15) (226)、2.046 (9) (134)、7.35 (6) (011) 和 1.909 (5) (125)。Kenoargentotetrahedrite-(Zn) 与其他具有 [Ag6]4+ 团簇的 keno-member 四面体结构相同。结构细化结果证实了 M(2) 位上亚价六价银簇的位占因子与 S(2) 位上空位的位占因子之间的耦合关系。这一关系进一步证实了缺S四面体的电荷平衡置换机制:6M(2)Ag++S(2)S2-= M(2)[Ag6]4++S(2)□。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kenoargentotetrahedrite-(Zn), [Ag6]4+(Cu4Zn2)Sb4S12□, a new member of the tetrahedrite group from the Yindongpo Au deposit, China
Abstract. The new mineral kenoargentotetrahedrite-(Zn), [Ag6]4+(Cu4Zn2)Sb4S12□, was discovered at the Yindongpo Au deposit, Henan Province, China. It occurs as black metallic anhedral grains or equant crystals up to 40 µm in size. It is opaque in transmitted light and shows a greenish-grey colour in reflected light. Electron microprobe analysis for the studied material gave the empirical formula (on the basis of total cations being equal to 16 atoms per formula unit, apfu): M(2)(Ag3.75Cu2.25)Σ6M(1)[Cu3.90(Zn1.18Fe0.69Cd0.26)Σ2.13]Σ6.03X(3)(Sb3.69As0.27)Σ3.96S(1)S11.94 S(2)□. Kenoargentotetrahedrite-(Zn) is cubic, I4‾3m (no. 217), with a = 10.4624(4) Å, V= 1145.23(13) Å3, and Z= 2. The crystal structure has been refined to a final value of R1= 0.0247 on the basis of 274 independent reflections (Fo > 4σ (Fo)) by using single-crystal X-ray diffraction data. The seven strongest X-ray powder diffraction lines (d in Å (I) (hkl)) are the following: 3.010 (100) (222), 1.844 (30) (044), 2.606 (22) (004), 1.572 (15) (226), 2.046 (9) (134), 7.35 (6) (011), and 1.909 (5) (125). Kenoargentotetrahedrite-(Zn) is isostructural with other keno-member tetrahedrites with the [Ag6]4+ cluster. The structure refinement result confirms the coupling between the site occupancy factor of subvalent hexasilver clusters at the M(2) site and that of the vacancy at the S(2) site. This relationship further substantiates the charge balance substitution mechanism of S-deficiency tetrahedrites: 6M(2)Ag++S(2)S2-= M(2)[Ag6]4++S(2)□.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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