牦牛坪稀土矿区氟碳铈矿与氟碳钙铈矿矿物学

四川省牦牛坪稀土矿区钙稀土氟碳酸盐矿物有氟碳铀矿、氟碳钙铈矿以及笔者发现并命名的牦牛矿。本文旨在简述氟碳铈矿和氟碳钙铈矿的矿物学特征。牦牛坪钙稀土氟碳酸盐类矿物具有强选择轻稀土的特点。其中占９０％以上的氟碳铈矿有两种类型，一种为裂理发育的板状半自形柱状晶体，矿区大量出现。另一种为自形柱状晶体，在矿区极为少见，这种柱状自形氟碳柿矿晶体在自然界中极为罕见。红外吸收光谱表明，氟碳铈矿结构中，具有少量的附加阴离子（ＯＨ）－或者氟碳铈矿中有极少量羟氟碳铈矿。氟碳钙铈矿多为自形晶体，晶面横纹发育，形态多样、典型。但矿区含量甚微。Ｘ射线衍射分析表明，用Ｘ射线苷多菲照相不能分辨钙稀土氟碳酸盐系列矿物经常发育的体衍生多晶现象。

The Study on Mineralogy of Bastnaesite and Parisite in Maoniuping Ore Deposite

astnaesite, Parisite and Maoniunite-Ce that was discooered and named by the authorare there in the Maoniuping Rare Earth Ore Deposite in Sichuan Province. The paper briefly relates the mineralogical properties of Bastnaesite and Parisite. Bastnaesite which makes up 90 percent ore mineral in the district has two types. One is the subeuhedral and tablet cryst and perfectparting develops. The other is the euhedral and prismatic crystal. Prismatic euhedron of Bastnaesite is rarely occurred in nature. Infrared absorption spectrum of Bastnaesite showed that there islittle hydroxybastnaesite or there are additional anions (OH)- in the crystal structure. Parisite inthe district is maily euhedral crystal and horizontal crystal striations developed very well.