陕西洛南绿松石的结构构造特征研究

A study of texture and structure of turquoise from Luonan, Shaanxi Province

采用偏光显微镜观察、扫描电镜、X射线粉晶衍射分析,对产于绿松石遗址陕西洛南的绿松石进行了详细的结构构造研究。结果表明,陕西洛南绿松石的结构多呈隐晶质结构,部分可见环带状结构、结核状结构;可见块状构造、致密块状构造,部分见葡萄状构造;扫描电镜下观察陕西洛南绿松石多呈鳞片状结构、不规则团块状分布,可见板状绿松石微晶不规则分布,部分见孔隙分布;绿松石微晶越接近它形,孔隙越少,排列越均匀,则结构越紧密,呈现致密块状构造;反之则呈葡萄状构造;XRD实验结果表明,样品中均含有绿松石和石英,部分样品中含有少量的伊利石和高岭石。

Luonan area of Shaanxi Province is a historic site of turquoise and is a potential source of neolithic turquoise products. The texture and structure of turquoise from Luonan area of Shaanxi Province were studied by microscope, SEM, XRD experiments in this paper. The results show that the turquoise from Luonan area of Shaanxi Province mainly has cryptocrystalline texture, with some samples exhibiting band texture and nodular texture, and has lumpy structure, dense lumpy structure and minor grape structure. The observation under SEM shows that the turquoise is mainly of flaky texture and irregular lumpy distribution. Tabular turquoise microcrystals are distributed irregularly, and pores can be seen among them. The microcrystals of turquoise are somewhat anhedral, the less pores they have, the evener their arrangement, and the denser their texture, thus exhibiting dense massive structure. On the contrary, it has grape structure. XRD results show that all the samples have turquoise and quartz, and some samples contain small amounts of illite and kaolinite.