Rare earth element (REE) content of shale, coal and coal byproducts, and potential for Canadian REE supply : a literature review and initial assessment / O.H. Ardakani, K. Biggart, and K.E. Dewing. : M183-2/8914E-PDF

"Rare earth elements (REE, or REY if including Yttrium) are comprised of the lanthanide series of elements on the periodic table (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), as defined by the International Union of Pure and Applied Chemistry (IUPAC). Scandium and Y, although not lanthanides, are commonly considered to be REE as well due to their similar chemical properties. The REE are often referred to as a single group, but in practice, each individual element has a specific set of end-uses, and so the global demand varies between them"--Introduction, page 1.

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