Rare Earth Elements Are Important. Ce and la are important as catalysts, and are used for petroleum refining and as diesel additives. The concentration of rees in the earth's crust is estimated to be between 150 to 220 parts per million, which is higher than the concentration of other metals mined for industrial use, such as cu or zn.
What is the most valuable rare earth metal?
Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). From the 1950s until the early 2000s, cerium oxide was a very popular lapidary polish. Again, they are rarely found in extractable concentrations. Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image).
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