“…In this regard, some scholars have classified both Scandium and yttrium into the heavy element category. [11][12][13] On the other hand, some others have highlighted that the third category RE can be classified as medium rare earth (MREEs) which refers to the elements of Sm, Eu, and Gd. [14][15][16] It is noteworthy that there are six different ores mineral from industry productions which include bastnasite [(Ce,La)(CO 3 )F], monazite [(Ce,La)PO 4 )], xenotime (YPO 4 ), loparite[(Ce,Na,Ca)(Ti,Nb)O 3 ], apatite [(Ca,REE,Sr,Na,K) 3 Ca 2 (PO 4 ) 3 (F,OH)], and ionadsorption clays.…”