| Crystal Chemistry Research of Minerals of Nigerite Group and Its Significance |
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| 作者单位： | Chen Jingzhong Faculty of Material Science and Chemical Engineering，China University of Geosciences，Wuhan 430074 Wang Fang Faculty of Material Science and Chemical Engineering，China University of Geosciences，Wuhan 430074; Department of Chemistry and Biology Education，Shenzhen University，Shenzhen 518060 Han Wei Faculty of Material Science and Chemical Engineering，China University of Geosciences，Wuhan 430074 Zhang Ronghong Institute of Gemology，China University of Geosciences，Wuhan 430074 Peng Jue Faculty of Material Science and Chemical Engineering，China University of Geosciences，Wuhan 430074 |
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| 基金项目： | ThispaperissupportedbytheNationalNaturalScienceFoundationofChina (No .492 72 0 91 ) |
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| 摘 要： | SinceJacobsonandWebb (194 7)firstlyfoundthenigeriteinNigeria ,mineralogistshavefounditinmanycountriessuchasRussia (EastSiberia ,195 8) ,China(Hunan ,196 3) ,Portugal (196 5 ) ,Australia (1976 )andsoon .Greyetal.(1979)determinedaccuratelythecrystalstructureofnigerite (2 4R) .In 1988,Chenfoundakindofendmembermineralofnigerite ,whichisMg riched .ByapprovingofCommissiononNewMineralsandMineralNames (CNMMN) ,thismineralwasnamedpengzhizhongite .Inthepast ,somemineralogistsdidnotfurtherdis t…
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| 关 键 词： | 氧化物 矿石 晶体结构 阳离子 宝石学 材料科学 |
Crystal Chemistry Research of Minerals of Nigerite Group and Its Significance |
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| Authors: | Chen Jingzhong Wang Fang Han Wei Zhang Ronghong Peng Jue |
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| Abstract: | There is a type of complex oxide mineral, composed of many elements such as Sn, Mg, Fe,Zn, Ti, Mn, Al, etc. , in the areas of Anhua, Linwu and Shizhuyuan of Hunan Province. These minerals belong to nigerite, Mg-nigerite (pengzhizhongite), etc.. According to the principle of closest packing, the crystal chemical properties of nigerite (brown), pengzhizhongite (buff), Zn-nigerite (fawn),Fe-nigerite, Mn-nigerite (greenish-black) etc. have been analyzed. Their crystal structures may be characterized by O (the layers of cation octahedral coordinations), T1 (the mixed layers of cation octahedral coordinations and cation tetrahedral coordinations in same directions), T2 (the mixed layers of cation octahedral coordinations and cation tetrahedral coordination in different directions). The position of layerO and layer-T is alternate permutation. The crystal structure of pengzhizhongite (6H) may be expressed by …OT2OT1OT1…, taaffeite (8H), …OT2OT1 OT2OT1…, and nigerite (24R), … OT1OT2OT2OT1 … ×3 etc.. In their structure, there are not only the crystal structure units of spinel … OT2OT2… but also the units of nolanite … OT1 OT1 …. The research of these minerals has important theoretic and practical significance in the fields of minerals, gemology, material science etc.. |
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| Keywords: | oxide of nigerite group crystal structure crystal chemistry new mineral new polytype gemology material science |
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