木那场口翡翠及其皮壳的宝石学特征  

Gemmological Characteristics of Jadeite and Its Crust from Muna Mine

作　　者：严艳[1] 业冬[1] 翁静燕 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《宝石和宝石学杂志》2015年第1期10-16,共7页Journal of Gems & Gemmology

摘　　要：帕敢场区是缅甸最重要的翡翠矿区,木那场口是帕敢场区中的著名场口之一。本文对木那场口翡翠及其皮壳的宝石矿物学特征进行详细探究,为后续研究木那场口翡翠提供相关资料。选取木那场口产出的翡翠样品,对其进行了外观特征观察、偏光显微镜观察以及X射线粉末衍射测试。结果表明,木那场口翡翠样品皮壳呈白色到黄褐色,多为细沙皮,皮薄且皮肉界限清楚,内部质地较致密,透明度较好,常见絮状飘花。木那场口翡翠样品的显微结构呈自形晶粒结构,包括纤维交织结构、柱状变晶结构或不等粒变晶结构。木那翡翠原石样品及其皮壳的主要矿物组成均为硬玉,其玉肉中含有绿辉石,皮壳含有高岭石、软锰矿、三水铝石、赤铁矿及钠长石。Pharkant area is the most important jadeite origin in Myanmar, and Muna mine is one of the famous mines in Pharkant area. In this paper, by means of appearance observa- tion, polarizing microscope and X-ray powder diffraction, the gemmological and mineralogi- cal characteristics of jadeite and its crust from Muna mine were researched in detail, in order to provide relevant informations for follow-up studies about jadeite from Muna mine. The re- suits show that the crust of jadeite from Muna mine is white to tawny and has fine sand crust mostly. The tactile impression of crust is sand-like or waxy. The crust of jadeite from Muna mine is thin, and the boundaries of jadeite and its crust are clear. The internal texture of jadeite from Muna mine is dense relatively, and the transparency of jadeite from Muna mine is pretty good. Flocculent ribbon is seen frequently in jadeite. The microstructures of jadeite from Muna mine are euhedral grain structure, including fibers interwoven structure, colum- nar crystalloblastic structure or inequigranular crystalloblastic structure. Jadeite is the main mineral of the crust and the jade from Muna mine. Besides the jade from Muna mine has green pyroxene, and the crust of jadeite from Muna mine contains kaolinite, pyrolusite, gibbsite, hematite and albite.

关 键 词：翡翠 宝石学特征 木那场口 缅甸 

分 类 号：TS93[轻工技术与工程]