【摘 要】
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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 Hun
【机 构】
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Faculty of Material Science and Chemical Engineering,Department of Chemistry and Biology Education,I
论文部分内容阅读
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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