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From the Earth Institute at Columbia University:


There is no firm definition of rare earth metals, but the term generally refers to metals used in small quantities. Rare earth metals include: rare earth elements—17 elements in the periodic table, the 15 lanthanides plus scandium and yttrium; six platinum group elements; and other byproduct metals that occur in copper, gold, uranium, phosphates, iron or zinc ores. While many rare earth metals are actually quite common, they are seldom found in sufficient amounts to be extracted economically.

https://blogs.ei.columbia.edu/2012/09/19/rare-earth-metals-will-we-have-enough/

Any more brain busters?