新疆阿尔泰彩色电气石的颜色成因研究

彩色碧玺（彩色电气石）是新疆阿尔泰花岗伟晶岩中富有特色的一种名贵宝石，主要有碧绿、黑绿、黄绿、红色和玫瑰色碧玺。通过对彩色电气石的岩石化学分析、Ｘ－衍射、紫外可见光吸收光谱和穆斯鲍尔谱测试分析，结合宏观地质观察，认为阿尔泰宝石级彩色电气石Ａｌ２Ｏ３含量高（＞４０％）而铁（锰）含量低，形成于碱性介质环境，多出现在钠锂型伟晶岩或钠长石富集地段。彩色电气石的颜色与晶体格架中配位金属离子种类、含量、物理特征及其生长阶段等因素有密切关系。铁、锰和锂离子是致色原因之一；微量元素，过渡性致色离子的存在与含量的高低也是造成电气石多色的原因之一

STUDY OF COLOR TOURMALINES FOR THEIR COLOR GENESIS FROM ALTAY, XINJIANG

Tourmalines are distinguishing precious gems in grano pegmatites in, Altay, Xinjiang, which are mainly dark green, black green, yellow green, red and rose in color. Based upon the analysing and plating results of the color tourmalines by petrochemistry, X ray diffraction, ultraviolet visible light absorption spectrum and Mossbauer spectrum, and combining with field geological investigations, it is suggested that the colors of tourmalines are closely related to the kinds, contents, physical characters and growth stages of metalic cation in coordination octahedron. Iron, manganese and lithium cations are one of the color resulting factors. Occurence of trace elemerts and tran sitional color resulting cations and their ower or higher contents are also one of the factors resulted in occurence of polychrome tourmalines.