Abstract: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 P63/mmc, a0=0.56076(4)nm , c0=2.20227(5) nm. Electron microprobe analyses are CaO 8.10, Na2O 0.02, TiO2 4.27, SiO2 0.83, Al2O3 80.025, FeO 5.44, MgO 1.86, giving the chemical formula (Ca0.99 Na0.004)0.994 (Al10.79 Ti0.40 Si0.09 Mg0.32 Fe0.52)12.12 O19, theoretically as CaAl12O19. There exist 12 absorption bands in the infrared spectrum, showing the feature of complex oxides in hibonite.