| 21. | Gold, copper, lead, zinc, nickel, marble, and various rare earth metals were discovered but quantification was not done.
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| 22. | "' Di-( 2-ethylhexyl ) phosphoric acid "'( DEHPA or HDEHP ) is an organophosphorus compound with the rare earth metals.
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| 23. | "' Terbium silicide "'is a chemical compound of the rare earth metal terbium with silicon having chemical formula TbSi 2.
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| 24. | During May and June 2014, North Korea sold over US $ 1.88 million worth of rare earth metals to China.
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| 25. | The metal itself was too electropositive to be isolated by then-current smelting technology, a characteristic of rare earth metals in general.
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| 26. | China produced about 81, 000 tons of rare earth metals in 2001; the number jumped to about 120, 000 by 2006.
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| 27. | 6 . Thermodynamic studies on the complexation processes between some amino acids and some rare earth metal ions in aqueous solution.
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| 28. | On 4 April 2011, the American rare earth metal producer Molycorp announced its acquisition of a 90 % stake in AS Silmet.
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| 29. | To combat this supply disruption other countries, such as Japan, are attempting new and innovative methods of mining these rare earth metals.
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| 30. | The most widely studied systems are those involving rare earth metal oxides, Ln 2 O 3, including yttria, Y 2 O 3.
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