翡翠的白色次生变化产物初步研究

翡翠的白色次生物通常与褐色次生物共存,说明两者形成于相同的表生环境,即氧化环境。白色次生物既可以白沙皮的形式出现,也可以白色絮状物或白斑的形式存在于翡翠的裂隙及其附近颗粒之间。白色次生物在翡翠中以细小粘土矿物等的集合体形式分布于硬玉颗粒的边缘和裂隙中,以交代结构为主,充填结构为辅。结合红外光谱分析和电子探针测试可知,翡翠中的白色次生变化产物以高岭石或高岭石质为主,另外含有不常见的副钡长石和氟硅钙钠石,说明白色次生物的矿物组成较为复杂。

A preliminary study of white secondary substances of jadeite jades

White secondary substances usually coexist with brown secondary substances in the jadeite jade. The phenomena show that both of them were formed in the same exogenic environment, which is also known as the oxidizing environment. The white secondary substances are the main component of the white shells, and can exist in the fractures and the gaps among granules, looking like white floccules or white spots. White secondary substances are small collections of mainly clay minerals existing on the edges and in the cracks of the grains of jadeites. They belong mainly to metasomatic texture and subordinately to cavity filling texture. Infrared absorption spectroscopic and electron microprobe analyses show that the white secondary substances are mainly kaolinite or kaolinitic, and there are paracelsian and agrellite which seldom occur in rocks. It is shown that the composition of white secondary substances is relatively complicated.