Preliminary studies to distinguish omphacite from jadeite

摘要：

The author studied how to distinguish Omphacite from Jadeite through using basic gemmologicalmethods such as visual observation，R．I．，S．G．，microscopic method，and also pertographic study throughthin sections together with XRD，UV-vis—NIR spectrophotometry，and FTIR methods．The preliminaryconclusion is：in order to distinguish jadeite from omphacite one could use visual observation：omphacite isdark to very dark green to opaque whereas jadeite can be colourless to pale or bright green；RI：omphacite is 1．68to 1．72 whereas jadeite is 1．65 to 1．67；SG：omphacite is 3．35 to 3．40 whereas jadeite is 3．33 to 3．36；and EDAX：jadeite should contain more than 80％Na compared to Ca，and more than 80％or 50％A1 compared to Mg+Fe2+ or to Fe3+ respectively．Any chemical compositions departing from this should not be called jadeite．

关键词： jadeite Omphacite distinguish

作者: Panjawan Thanasuthipitak Tay Thye Sun Wilawan Atichat Henry A．H(a)nni Theerapongs Thanasuthipitak

作者单位: Dept Geol Sci，Chiang Mai University,Chiangmai，Thailand Far East Gem Lab，360，Orchard Road＃09—04，International Building，Singapore 238869 GIT,Gemmological Research and Testing uilding，Faculty of Science，Chulalongkorn University，Phayathai GemExper GmbH，Postfach 921，CH4001，Basel，Switzerland

会议类型: 国内会议

会议名称: 玉石学国际学术研讨会

会议地点: 北京

会议语种:英文

页码: 62-65

在线出版日期: 2011-09-01（万方平台首次上网日期，不代表论文的发表时间）