坡缕石精细鉴定的粉末X射线衍射法

对安徽官山两个含镁量不同的坡缕石进行了粉末X射线衍射(XRD)分析,结果表明其中富镁者为正交晶系、贫镁者为单斜晶系矿物,细化了判别坡缕石晶系的X射线粉末衍射标志。在排除石英和蒙脱石或伊利石的影响后,若图谱中出现d值为0.446 nm和0.428 nm的衍射线,则可认为在该凹凸棒粘土中含有正交晶系坡缕石。晶胞参数计算结果亦表明富镁坡缕石为一正交晶系坡缕石,贫镁坡缕石为一单斜晶系坡缕石。

POWDER X-RAY DIFFRACTOMETRY FOR FINELY IDENTIFYING THE SYMMETRY OF PALYGORSKITE

Two palygorskites differing in color were collected in the Guanshan attapulgite deposit,Anhui Province and studied by powder X-ray diffractometry and X-ray fluorescence spectrometry.Pink one differs from gray one in its higher magnesium contents.Profiles are characteristic of the orthorhombic and monoclinic double-chain structures proposed and narrowed for palygorskites.The possibility is excluded that quartz and montmorillonite or illite,orthorhombic palygorskite can be confirmed in attapulgite clay if profiles near 0.446 nm and 0.428 nm appear in the observed XRD patterns.The calculated parameters also corroborate that the pink,magnesium-rich palygorskite is orthorhombic in form and gray in color,and magnesium-poor one is monoclinic in form.