辽宁瓦房店金伯利岩中铬铁矿的成分分析

Composition Analysis of Chromite in Kimberlite From Wafangdian, Liaoning

铬铁矿为铬铁矿亚族中一个矿物种,表现为铬、铝、铁和镁的类质同象代替。仅凭肉眼鉴定,不能很准确的判断铬铁矿的种属。本次实验是利用电子探针波谱仪对矿物进行定性和定量分析,通过对样品所含主要元素的测试,推算铬铁矿的种类。八件样品的测试结果为:MgO为7.62%～14.23%、Fe O为16.27%～26.96%、TiO2为0.03%～3.12%、Al2O3为1.45%～7.49%、MnO为0.01%～0.21%、Cr2O3为59.33%～64.74%;化学成分总和为99.20%～100.99%,推测样品中的铬铁矿为富镁铬铁矿。

Chromite is a mineral species in the chromite subfamily, which is represented by the isomorphism of chromium, aluminum,iron and magnesium. Only by visual inspection, the species of chromite cannot be accurately determined. In this experiment, the mineral was qualitatively and quantitatively analyzed by an electron probe spectrometer, and the type of chromite was estimated by testing the main elements contained in the sample. The analysis results of 8 samples showed that: MgO 7.62%?14.23%, FeO 16.27%?26.96%, TiO20.03%?3.12%, A1203 1.45%?7.49%, MnO 0.01%?0.21%,Cr203 59.33%?64.74%, the total amount of chemical composition was 99.20%~100.99%. It was speculated that the chromite in the sample was a magnesia-rich chromite.