【摘要】 内蒙古白云鄂博的氟碳钙铈矿,经电子衍射研究,观察到三种多型:4H,P6α=7.12 c~=56.4 ;6R,R3α=7.12 c~=84.6 ;3R,R3α=7.12 c~=42.3 。其中4H 为新多型。湖北竹山氟碳钙铈矿仅观察到一种多型6R。白云鄂博样品中发现3R 与6R 共晶格取向连生,以及3R 型共格双晶。更多还原

【Abstract】 The study on electron diffraction of bastnaes ite from Bayan Obo,Nei Mongol, permits us to find three politypes of the mineral:4H,P6:a=7.12.,c=56.4; 6R,R3:a=7.12,c=84.6;3R,R3:a=7.12,c=42.3.Among them the 4H is a new politype.For basnaesie from Zhushan,Hubei Province,only a politype 6R was observed,in samples from Bayan Obo an eutectic-oeriented intergrowth of 3R and 6R was found,and the eutectic twin of 3R type was observed.更多还原