Keywords: 
• scandium /
• existing form /
• detrital zircon /
• bauxite /
• southern Chongqing

Abstract: The study of aluminum clay rock of Dafoyan mining area proves  that the scandium does not exist in the form of independent minerals and ion adsorption. There is nearly no organic matter in bauxite ore-bearing horizon and we can also ruled out the possibility of the scandium integrate with organic matter. We find the scandium is rich in detrital zircon, base on the results of the SEM and the analysis of spectrum. The scandium widespread distribute on the surface of detrital zircons, and there are different percentage composition of scandium in different parts of the detrital zircon, the maximum is 2.75%, and the minimum is not detected scandium, moreover the percentage composition of scandium in the pits or cracks are higher frequently. So, we consider that there are likely three forms of scandium in detrital zircons: isomorphism, ion-adsorption and the microscopic structure of the mixed in with content. These  researches will provide a theoretical basis for the development and utilization of the bauxite in southern Chongqing in future.