摘要
为了研究拉长石晕彩与其内部结构的关系，采用Philips CM12型透射电镜结合矿物薄片，对拉长石样品的不同颜色区域进行了观察。对晕彩效应成因的研究结果表明，拉长石的晕彩效应是典型的干涉型晕彩，内部的出溶连生结构是导致拉长石产生晕彩的根本原因。只有当连生片晶的厚度为128-252nm时，拉长石才能产生可见光范围内的干涉色。由于连生片晶不是绝对平行，表面也并不完全平坦，导致所显现的干涉色不是单一颜色。为了更好地显现晕彩，宝石的切磨方向应与内部出溶连生结构的方向尽量一致，宝石表面与连生片晶的夹角越小，观察到晕彩的方向就越正，当夹角大于45°后，样品表面就观察不到晕彩了。晕彩的颜色受出溶条纹厚度的影响，条纹组的单元层厚度越大，干涉色波长越长；两组条纹的厚度比越大，干涉色波长越长；据此建立了晕彩拉长石的内部结构模型。
This paper lucubrates labradorescence effect with TEM and mineral thin sections. The result indicates that labradorescence is an interference phenomenon due to the BФggild intergrowth lamellar. Only when thickness of the lamellar is between 128 nm and 252 nm, the labradorescence effect is visible. As the intergrowth lamellar is not absolutely parallel and the surface is not absolutely smooth, the interference color is not single. To display the effect better, cutting direction ought to be consistent with the direction of the intergrowth lamellar. Iridescent color is influenced by thickness and ratio between the two groups of lamellar. The thicker the lamellar is,the longer the wavelength of iridescent color is; and the bigger the ratio is, the longer the wavelength of iridescent color is. In addition, this paper also establishes the internal structure model of labradorite according to the result.
出处
《地质科技情报》
CAS
CSCD
北大核心
2006年第2期35-40,共6页
Geological Science and Technology Information
关键词
晕彩
博吉尔德连生
出溶连生片晶
干涉
iridescence
BФggild intergrowth
exsolution intergrowth lamellar
interference
作者简介
谢浩（1978-），女，助教，现正攻读矿物学、岩石学、矿床学专业博士学位，主要从事宝石学的教学和科研工作．
