草莓红“绿柱石”的晶体化学研究  

CRYSTAL CHEMISTRY OF RASPBERRY "BERYL

作　　者：廖尚宜[1] 彭明生[1] 

机构地区：[1]中山大学宝石矿物材料研究所,广东广州510275

出　　处：《矿物学报》2003年第4期319-322,共4页Acta Mineralogica Sinica

基　　金：广东省自然科学基金项目(编号:980269)

摘　　要：利用扫描电镜 能谱仪(SEM EDS)、电子探针(EPMA)、高分辨等离子质谱仪(HR ICP MS)和X 射线单晶衍射仪等方法,对一种新的含高铯矿物进行了分析,发现其成分、结构和光学特征等均异于常见的含Cs绿柱石(Morganite)。它是一种含高铯属三方晶系的、新发现的宝石矿物,称此宝石矿物为草莓红"绿柱石"(Rasp berry"Beryl")。晶体化学式为:(Cs0 627Na0 095K0 041Rb0 031Ca0 028)0 822(Be2 099Li0 869)2 968(Al1 964Fe0 010)1 974Si6 040O18。晶胞参数a=1 59735nm,c=2 78444nm,α=β=90°,γ=120°,V=6 15274nm3。折射率No=1 615～1 616,Ne=1 607±,双折射率为0 008～0 009,S G 为3 00～3 10。Several analytical methods such as SEM-EDS, EPMA, HR-ICP-MS and X-ray single crystal diffraction are used to investigate a newly found Cs-rich mineral. It is discovered that it has a distinct chemical composition, crystal structure and optical properties, therefore it is different from normal beryl. It is concluded that it is a new Cs rich mineral, belonging to the trigonal system. It is called 'raspberry beryl'. Empirical formula: (Cs_(0.627)Na_(0.095)K_(0.041)Rb_(0.031)Ca_(0.028))_(0.822)(Be_(2.099)Li_(0.869))_(2.968)(Al_(1.964)Fe_(0.010))_(1.974)Si_(6.040)O_(18),unit-cell parameters:a=(1.59735 nm),c=(2.78444 nm),α=β=90°,γ=120°,(V=6.15274 nm^3);R.I.:N_o=1.615-1.616,N_e=1.607;birefringence:0.008-0.009; S.G.:3.00-3.1.

关 键 词：绿柱石 超结构 三方晶系 宝石矿物 晶体化学 

分 类 号：P579[天文地球—矿物学]