翡翠中钠铬辉石的矿物学特征研究  

Mineralogical Characteristics of Ureyite in Jadeite Jade

作　　者：殷小玲 项贤彪 彭明生 

机构地区：[1]广东省地质科学研究所,广东广州510080

出　　处：《宝石和宝石学杂志》2007年第2期5-7,I0001,共4页Journal of Gems & Gemmology

摘　　要：采用电子探针、X射线衍射和吸收光谱分析研究翡翠中钠铬辉石的矿物学特征。结果显示,钠铬辉石与翡翠呈共生关系;其分子式为(Na0.83Ca0.02)(Cr0.78Al0.10Fe0.08Mg0.02)Si2.06O6;晶胞参数a=9.530A°,b=8.672A°,c=5.264A°,β=107.51°,V=414.88;密度为3.55g/cm3;钠铬辉石中Cr3+的晶体场跃迁决定了其具有深浅程度不同的绿色调。In the paper, mineralogical characteristics and compositions of ureyite in jadeite jade are studied by using EPMA,X-ray diffraction and absorption spectroscopy analysis. The results show that ureyite is paragenous with jadeite jade, and the chemical formula of ureyite is （Na0.83 Ca0.02 ） （Cr0.78 Al0.10Fe0.08Mg0.02）Si2.06O6. The unit cell parameters of ureyite are α=9.530 ^°A, b =8.672 ^°A, c =5. 264 ^°A,β = 107.51°, V =414.88 and the density is 3.55 g/cm^3. Different shades of green in ureyite are related to the crystal-field transition frequency of Cr^3＋.

关 键 词：钠铬辉石 翡翠 矿物学特征 成分分析 

分 类 号：P619.28[天文地球—矿床学]