| From Istockanalyst.com: The rare earth metals are, in fact, not that rare! The most commonly occurring rare earth metals - cerium, lanthanum, neodymium and yttrium - are actually more common in the Earth's crust than lead. And even silver.
While cerium, the most abundant rare earth metal, is more prevalent (60 parts per million (ppm)) than copper, even lutetium (0.5 ppm) and thulium (0.5 ppm), the least abundant, are to be found in the Earth's crust in greater quantities than antimony, bismuth, cadmium and thallium..... Full Article: Source
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