淡水珍珠中球文石的XRD谱  

XRD PATTERNS OF VATERITE IN BIOMINERALIZED FRESHWATER PEARLS

作　　者：马红艳[1] 崔福斋[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530005

出　　处：《矿物学报》2003年第4期371-373,共3页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:20266002)

摘　　要：球文石是CaCO3的同质多象变体,在自然界中很少出现。对不同质量淡水珍珠进行XRD物相分析,结果表明不同颜色的优质淡水珍珠中几乎全部由文石组成,方解石不发育;劣质淡水珍珠中主要含有文石、球文石;在劣质的淡水无光珠发现有球文石,可能与这些珍珠混有较多的有机物有关,文中例举了含球文石与不含球文石的淡水珍珠XRD谱。Different luster freshwater pearls (consisting of calcium carbonate) in China were examined with X-ray diffraction (XRD). The main component of good- quality freshwater pearls is aragonite in all cases. Only a trace amount of calcite (<2%) was found, but in some cases, a miner amount of vaterite was detectable in some lusterless freshwater pearls. Vaterite is a very unstable polymorph of calcium carbonate, rarely occurring in nature. This paper presents the XRD patterns of vaterite in poor-quality fresh water pearls.

关 键 词：淡水珍珠 球文石 生物成矿 XRD谱 

分 类 号：P575[天文地球—矿物学] TU458[天文地球—地质学]