缅甸不同矿点翡翠的矿物学特征

Mineralogy of Burma jade from different mines

通过对缅甸达木坎矿区、帕敢矿区、隆肯矿区的4个矿点翡翠样品的偏光显微镜、电子探针、X射线粉晶衍射等测试,其结果表明:各矿点翡翠均以粒状变晶结构为主,主要矿物为硬玉,次要矿物有钠长石、云母类、辉石类、闪石类矿物、沸石类矿物等。其中,哥因角矿点翡翠矿石中有较大量辉石类矿物,纳莫矿点发现较大量方沸石矿物。沸石是含水矿物,而含水矿物作为矿脉的前锋组成矿物更为合理,故纳莫翡翠矿体形成深度应相对其它矿点更深。隆肯矿点翡翠样品w(A_l2O_3)=23.187%,w(Na_2O)=17.706%,w(TiO_2)=0.349%,w(K_2O)=0.298%,高于其它矿点;哥因角矿点翡翠样品w(CaO)=1.821%,w(MgO)=2.983%,w(FeO)=1.432%,高于其它矿点;纳莫矿点样品w(SiO_2)平均61.91%,为4个矿点中最高。

Identification under polarizing microscope and electron probe,X ray powder diffraction analysis are carried out on samples from Burma＇s four jade occurrences of three areas（Damuka,Longken and Hpakant）.The results show that jadeite from all the four occurrences is in granoblastic texture consisting mainly of jadeite mineral then sodium feldspar,mica,pyroxene,amphibole and zeolite.In the jadeite ore of angle of Chedorlaomer occur more pyroxene,and more analcite in nammaw occurrence.The zeolite-like minerals are water-bearing and it is more reasonable for them to be constituent of the jade vein front thus nammaw jade vein should be formed to more depth.Samples of Longken give values of w（Al_2O_3）=23.187%,w（Na_2O）=17.706%,w（TiO_2）=0.349%,w（K_2O）=0.298%that are higher than that of other occurrences,samples of angle of Chedorlaomer w（CaO）=1.821%,w（MgO）=2.983%,w（FeO）=1.432%,higher than that of other occurrences;average of SiO_2 of sample from Namer 61.91%the highest.