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利用Philips CM-12分析型透射电镜对四川昌北大型稀土矿床中钙铈氟碳酸盐矿物进行了研究。除证实氟碳钙铈矿(BS)存在3R和6R2种多型外,首次发现和研究了氟碳钙铈矿(BS)存在4H、12H、18R、24R、30R和36R6种新多型;伦琴矿(BS_2)1种6R新多型和B_2S新规则混层矿物2H、12R和24R3种中新多型。电子衍射和晶格象分析表明:该类矿物中众多新多型的产生,主要是由于矿物结构单元层沿(?)轴有序堆垛和[CO_3]的定向周期性变化所致。
Calcium-cerium fluorocarbon minerals from the large-scale rare earth deposits in Changbei, Sichuan Province were studied using Philips CM-12 analytical transmission electron microscopy. In addition to confirming the presence of 3R and 6R polymorphic species in bastnaesalite (BS), six new polymorphisms of 4H, 12H, 18R, 24R, 30R and 36R were found and studied in bastnaesite (BS) Minerals (BS_2) a new type of 6R and B_2S new rules mixed layer minerals 2H, 12R and 24R3 kinds of new polymorphism. Electron diffraction and lattice image analysis showed that many new polytypes in this kind of minerals are mainly due to the orderly stacking of mineral structural units along the (?) Axis and periodic changes of [CO 3] orientation.