摘要
1986年笔者在四川昌北稀土矿床中发现一种结晶完好的硅钛铈矿。矿物物理性质与我国白云鄂博产出者相似。矿物组分中富铌。晶体化学式为(Ce,La,Nd…Ca)_4Fe^(2+)(FeTiNb)_2Ti_2O_8[Si_2O_7]_2。经四圆单晶衍射和电子衍射测得晶胞参数相同,α=13.385(2),b=5.742(1),c=10.059(2),β=100.60(0.01)°,空间群C 2/m。对矿物晶体定向带轴进行了高分辨晶格象观测。
Described in this paper is a crystalline chevkinite occurring in a rareearth mineral deposit in northern Xichang, Sichuan Province. Its physical properties are similar to those of chevkinite occurring in Bayan Obo, Inner Mongolia, However, this mineral is Nb-rich.Its crystallochemical formula is(Ce, La, Nb, Ca)_4Fe^(2+)(Fe, Ti, Nb)_2Ti_2O_8(Si_2O_7)_2. The unit cell parameters determined by the four circle single diffractometer and electron diffraction are the same. The unit cell parameters are: a=13.385(2), b=7.742(1),c = 10.059(2), β = 100.60(0.01)~o. Space group = C2/m.Additionally, the lattice image observation has been made of the orientational crystal-zone axis of chevkinite.
出处
《矿物学报》
CAS
CSCD
北大核心
1991年第2期109-114,共6页
Acta Mineralogica Sinica
基金
国家教育委员会博士点基金
关键词
硅钛铈矿
稀土
矿床
电子衍射
chevkinite
electron diffraction
lattice image
Sichuan
