不同形态透闪石-阳起石消光特征探究  

Discussion on the extinction characteristics of tremolite-actinolite with different forms

作　　者：昝敏杰 高佳华 ZAN Minjie;GAO Jiahua(Testing&Certification International Group Beijing Technology Co.,Ltd.,Beijing 101102,China)

机构地区：[1]国检测试控股集团北京科技有限公司,北京101102

出　　处：《冶金分析》2025年第1期62-67,共6页Metallurgical Analysis

基　　金：中国国检测试控股集团股份有限公司青年基金项目(GJ012023035)。

摘　　要：石棉检测过程中发现,不同形态(棱柱状、针状、纤维束状)透闪石-阳起石表现出从正常到异常的消光现象。本文采用偏光显微镜和扫描电子显微镜(SEM)等技术手段,以不同形态透闪石-阳起石为研究对象,对消光特性进行探究。发现棱柱状透闪石-阳起石显示正常消光,以斜消光为主,少量颗粒平行消光;纤维束状(高棉状)透闪石-阳起石石棉,偏光显微镜下呈纤维束状集合体,显示平行消光;针状透闪石-阳起石石棉偏光显微镜下,通常显示最大或接近最大消光角和平行消光。本研究打破了传统单斜晶系角闪石与斜方晶系角闪石判定方法。对于日常石棉检测,准确识别透闪石石棉与直闪石石棉,仍需结合其他光学特征或测试手段。During the detection process of asbestos,it was found that the tremolite-actinolite with various forms(prismatic,needle-like,and fibrous) demonstrated the extinction phenomenon from normal to abnormal.In this study,the extinction characteristics of tremolite-actinolite with different forms were investigated by the means of polarizing microscopy and scanning electron microscope (SEM).It was found that the prismatic tremolite-actinolite exhibited normal extinction,which was mainly in inclined extinction with some particles showing parallel extinction.The fibrous (Khmer-like) tremolite-actinolite asbestos appeared as a bundle of fibers under polarized light microscopy, displaying parallel extinction.Needle-like tremolite-actinolite asbestos typically demonstrated maximum or nearly maximum extinction and parallel extinction under a polarizing microscope.This study challenged the traditional methods for distinguishing monoclinic and orthorhombic hornblendes.For the routine detection of asbestos,the accurate identification of tremolite asbestos and anthophyllite asbestos still required the integration of other optical characteristics or testing methods.

关 键 词：石棉 不同形态 消光特征 中心屏蔽色散染色法 透闪石 阳起石 棱柱状 针状 纤维束状 

分 类 号：P575[天文地球—矿物学]