我国邯邢地区黑铝钙石的发现及其研究

黑铝钙石是一种罕见矿物，在邯邢地区镁铝夕卡岩中，发现一种呈六方片状、黄色半透明的黑铝钙石晶体。本文对该晶体进行了粉晶Ｘ射线、四元衍射、电子探针和红外光谱测量，并认为黑铝钙石是镁铝夕卡岩早期阶段的产物，处在一种富铝、贫硅的地球化学环境和高温条件

The Discovery and Preliminary Study of Hibonite from Handan Xingtai Area, Hebei Province

Hibonite, a rare mineral, was discovered for the first time in China from Mg Al skarn in Handan Xingtai Area, Hebei Province. It occurs as yellow semitransparent hexagonal flaky crystals associated with corundum, spinel, clintonite, grossular and vesuvianite. An analysis of the mineral paragenesis diagram suggests that hibonite was formed in an Al rich and Si poor as well as high temperature environment. The crystal parameters determined by four circle diffractometer and X ray powder diffraction are space group P6 3/mmc, a 0=0.56076(4)nm , c 0=2.20227(5) nm. Electron microprobe analyses are CaO 8.10, Na 2O 0.02, TiO 2 4.27, SiO 2 0.83, Al 2O 3 80.025, FeO 5.44, MgO 1.86, giving the chemical formula (Ca 0.99 Na 0.004 ) 0.994 (Al 10.79 Ti 0.40 Si 0.09 Mg 0.32 Fe 0.52 ) 12.12 O 19 , theoretically as CaAl 12 O 19 . There exist 12 absorption bands in the infrared spectrum, showing the feature of complex oxides in hibonite.