| 1. | Mischmetal is used in the preparation of virtually all rare earth elements.
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| 2. | Later he became involved in the research of the rare earth elements.
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| 3. | Q . You've also expressed some ardor for the rare earth elements.
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| 4. | These are likely to be the transition elements or rare earth elements.
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| 5. | However, the use of rare earth elements makes these materials very expensive.
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| 6. | The Khanashin carbonatite in Helmand Province contains of rare earth elements.
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| 7. | Incompatible elements and rare earth elements are enriched in these lavas.
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| 8. | Nelsonite is currently mined in China for rare earth elements.
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| 9. | Distribution of rare earth elements was studied in a labolatory.
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| 10. | "' Fergusonite "'is a mineral comprising a complex oxide of various rare earth elements.
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