异类矿物结构基元层间层矿物及墨铜矿的研究

本文提出了“异类矿物结构基元层间层矿物”这一新概念，从五个方面限定了其含义，扩展了“间层矿物”的内涵。对其典型矿物墨铜矿进行了Ｘ射线，电子探针和高分辨透射电镜的初步研究，取得了一些新认识，墨铜矿在ｃ方向有序，重复周期为１１．４５Ａ，在ａ，ｂ方向无序，不存在超晶胞。

Interstratified MineraI with Basic Structure Sheets of Different classes and a Preliminary Study on VaIIeriite

The phenomena of interstratification(mixed layer)have been consideredas special structural phenomena in silicates since they were recognized. The-refore,interstratified minerals,whose basic structure sheets(BAS)belong tothe subclaee of layer silicate,have been classified into the category of clayminerals. However,there exists another kind of interstratified minerals whoseBAS belong to more than one class(such as sulfides,chlorides,hydroxides,carbonates and silicates).In order to compare with the traditional intersta-tified minerals,we propose a new concept-interstratified mineral with basicstwcture sheets of different classes,and restrict this concept within five res-pects from the structure and composition of BAS to the stocking regularityof BAS. Valleriite,a typical interstratified mineral with basic structure sheets ofdifferent classes,is also studied in this paper. Electron microprobe analysesindicate that the degree of mismatch between sulfide layer and hydroxidelayer is higher,the results of X-ray analyses show clearly the diffractionsfrom d_(001) to d_(007),and repetition interval of 11,45,The studies by means ofhigh resolution transmission electron microscopy also reveal the lattice fringeimage of 11.4 in c-direction,and disorder in a-and b-directions, o there isno supercell in valleriite,and this differs from the view held by H.T. Evans(1968)that valleriite is a mineral with supercell with c= 34.10a and a=64.46.