| New Varieties of Na-Ca-Ba-RE Fluorocarbonate Series Minerals |
| |
| 作者姓名： | 杨主明 张培善 陶克捷 |
| |
| 作者单位： | Institute of Geology，Academia Sinica，Beijing 100029，China |
| |
| 摘 要： | ＮｅｗＶａｒｉｅｔｉｅｓｏｆＮａ－Ｃａ－Ｂａ－ＲＥＦｌｕｏｒｏｃａｒｂｏｎａｔｅＳｅｒｉｅｓＭｉｎｅｒａｌｓ￥ＹａｎｇＺｈｕ－Ｍｉｎｇ；ＺｈａｎｇＰｅｉ－Ｓｈａｎ；ＴａｏＫｅ－Ｊｉｅ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＡｃａｄｅｍｉａＳｉｎｉｃａ...
|
New Varieties of Na-Ca-Ba-RE Fluorocarbonate Series Minerals |
| |
| Yang Zhu-Ming, Zhang Pei-Shan,Tao Ke-Jie.New Varieties of Na-Ca-Ba-RE Fluorocarbonate Series Minerals[J].Journal of Rare Earths,1994(3). |
| |
| Authors: | Yang Zhu-Ming Zhang Pei-Shan Tao Ke-Jie |
| |
| Abstract: | The unnamed Sr rich mineral and Ca-rich baiyunehoite-(Ce) were found in the Khibina alkali massif Kola Peninsula, and the Baiyun Ebo Nb- Ta- REE deposits, Inner Mongolia, respectively. Their chemical formulas based on electron microprobe analysis are and (Ca(0.46),Na(0.28) 0.16)0.09Ba(1.03)(Ce0.82,Sr0.38La0.35,Nd0.32,Pr0.09,Sm0.01)1.97(CO3)4F and (Na0.44,Ca0.32,0.24)1.00Ba1.07(Ce1.03,La0.46,Nd0.26,Pr0.08,Sr0.08,Sm0.02)1.93(CO3)4)F respectively. X-ray diffraction study yields the unit-cell parameters: a=0.5091 nm, c=2.302 nm for the unnamed Sr- rich mineral and a=0.5110 nm, c=2.313 nm for Ca-rich baiyuneboite (Ce). Both minerals are the intermediate member of the isomorphous series minerals between the unnamed mineral(Ca0.5,0.5)BaCe2(CO3)4 F and baiyune- boite-(Ce)NaBaCe2(CO3)4 F. The ionic radius analysis and the bond valence calculation on the basis of the structure of baiyuneboite- (Ce) indicate that Sr2 occupies the Ce site preferentially. while Ca2 occupies the Na site preferentially. The charge balance is maintained by a combinalion of Na RE3 = Ca2 Sr2 and 2Na =Ca2 |
| |
| Keywords: | Na-Ca-Ba-RE fluorocarbonate New varieties Physical properties Chemical composition Crystallographic data Isomorphous substitution |
| 本文献已被 CNKI 等数据库收录！ |
|
