As defined by IUPAC, rare earth elements or rare earth metals are a collection of seventeen chemical elements in the periodic table, specifically the fifteen lanthanoids plus scandium and yttrium.[2] Scandium and yttrium are considered rare earth elements since they tend to occur in the same ore deposits as the lanthanoids and exhibit similar chemical properties.They are mostly mined by the Chinese because no one else was really that interested in doing it, but now that they are cutting off exports mines are starting to be re-opened in the U.S.
Despite their name, rare earth elements (with the exception of the radioactive promethium) are relatively plentiful in the Earth's crust, with cerium being the 25th most abundant element at 68 parts per million (similar to copper).
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It's one of the few Rare Earth Mines in the US. It was closed for years and years and is finally reopening this year because of events just like this.
Just a random bit of trivia.
posted by Lord_Pall at 7:19 AM on January 29, 2011 [2 favorites]