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pegmatites feldspar beneficiation plants in Brazil,pegmatites feldspar beneficiation plant in india. pegmatites feldspar beneficiation plant in india. Rare earth element . A rare earth element (REE) or rare earth metal (REM), as defined by IUPAC, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium.