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内蒙古二连盆地2082砂岩型铀矿床中的主要工业铀矿物为水磷钙铀矿(Tristramite)。该矿物在中国是首次发现。其矿物颗粒细小,与黄铁矿、白铁矿等硫化物、黑色炭屑紧密共生。颜色为灰黑色—黑色,不透明,反射光下呈灰色—暗灰色、均质、无内反射。13个电子探针分析数据得出的平均化学成分为UO241.60%,CaO 14.50%,P2O522.71%,SO31.33%,FeO 0.81%。按照除磷以外阳离子数和为1计算的经验化学式为:(Ca0.589U0.351Fe0.026Na0.016Al0.009Y0.007)0.998[(PO4)0.729(CO3)0.225(SO4)0.038(SiO4)0.008]1.00.1.75H2O。简化式可以写成(Ca,U4+,Fe)[(PO4)(CO3)].2H2O。通过X射线衍射数据,用SHELXTL PC进行晶胞参数精修得到的六方晶胞,其参数为a=b=(0.69030±0.00129)nm,c=(0.63300±0.00083)nm。
The main industrial uranium mineral in the 2082 sandstone-type uranium deposit in Erlian Basin, Inner Mongolia, is Tristramite. The mineral was first discovered in China. The small mineral particles, and pyrite, iron ore and other sulfide, black coke closely together. The color is gray-black-black, opaque, gray-gray under reflected light, homogeneous, with no internal reflections. The average chemical composition of the 13 electron probe analysis data was U0241.60%, CaO 14.50%, P2O522.71%, SO31.33% and FeO 0.81%. The empirical formula calculated according to the number of cations other than phosphorus and calculated as 1 is: (Ca0.589U0.351Fe0.026Na0.016Al0.009Y0.007) 0.998 [(PO4) 0.729 (CO3) 0.225 (SO4) 0.038 (SiO4) 0.008] 1.00 .1 .75H2O. The simplified formula can be written as (Ca, U4 +, Fe) [(PO4) (CO3)] 2H2O. The parameters of hexagonal cells refined by unit cell parameters with SHELXTL PC are a = b = (0.69030 ± 0.00129) nm and c = (0.63300 ± 0.00083) nm by X-ray diffraction data.