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Atomic: M.A.C. | Reference
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Occurrence and Production of Praseodymium
Occurrence
Praseodymium is available in small quantities in Earth's crust (9.5 ppm). It is found in the rare earths minerals monazite and bastnasite, typically comprising about 5% of the lanthanoids contained therein, and can be recovered from bastnasite or monazite by an ion exchange process, or by counter-current solvent extraction.