Ultrastructure of a Columbite-Tantalite Mineral from the Zhaojinggou Ta-Nb Deposit in the North China Craton: Direct Evidence of the Formation Mechanism of the Columbite-Group Minerals

Figure 7

Al, Fe, K, and Mn maps of a FIB-cut of the columbite-tantalite mineral. The location of this FIB-cut is the same as in Figure 6.