“…REEs predominantly accumulate in deposits associated with alkaline igneous formations, specifically in carbonatite and pegmatite veins, and are often divided into light rare earth elements (LREEs: La, Ce, Pr, Nd, Sm, and Eu) and heavy rare earth elements (HREEs: Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu). In general, the abundance of LREEs is higher than that of HREEs according to the Oddo-Harkins effect [1,3]. These deposits serve as the primary sources for these valuable elements, and their precise characterization is indispensable in strategic resource planning and management.…”