湖南湘潭锰矿次生氧化带中天然锰钾矿晶胞参数的修正  

The refinement of crystal unit cell parameters of native cryptomelane in the supergene oxidation zone of the Xiangtan manganese deposit, Hunan Province

作　　者：高翔[1] 鲁安怀[1] 秦善[1] 郑辙[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《岩石矿物学杂志》2003年第1期77-79,共3页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目 ( 49972 0 17);科技部重大基础研究前期专项资助项目 ( 2 0 0 1CCA0 2 4 0 0 )

摘　　要：应用Rietveld -DBW 941 1和Pirum程序对湘潭锰矿次生氧化带中天然锰钾矿的X射线粉晶衍射数据进行了晶胞参数的修正 ,首次给出其晶胞参数 :a0 =0 .9974nm ,b0 =0 .2 86 3nm ,c0 =0 .9693nm ,β =91 .467° ,V =2 76 .66× 1 0 - 3nm3,同时指出天然锰钾矿晶体结构精细化的难点在于其呈隐晶质集合体的特征导致衍射峰宽化。This paper is mainly devoted to the refinement of the crystal unit cell parameters of the native manganese oxide from the supergene oxidation zone of the Xiangtan manganese deposit, Hunan Province. With the computer programs of Rietveld_DBW 9411 and Pirum, it is revealed that the body_centered monoclinic cryptomelane is the main phase of the mineral. It is for the first time to give the unit cell parameters of native cryptomlane in this area: a 0=0.997?4 nm, b 0=0.286?3 nm, c 0=0.969?3 nm,β=91.467°, V =276.66×10 -3 nm 3. It is also pointed out that the troubles of refining are caused by the extreme difficulty in finding a single crystal particle and by the XRD pattern characterized by broadening, relatively high background and asymmetry.

关 键 词：湘潭锰矿 次生氧化带 天然锰钾矿 晶胞参数修正 湖南 

分 类 号：P573[天文地球—矿物学] P618.32[天文地球—地质学]