31. Later it was shown that decipium was a mixture of samarium and other rare earth elements . 32. Thorium hydroxide is dissolved in an inorganic acid and then purified from the rare earth elements . 33. Neodymium metal, one of the rare earth elements , is the primary raw material in neo powder. 34. This chakra, being so closely related to the element of Earth, also reflects the earth elements . 35. Sinopac is engaged in development and production of rare earth elements ( REE ) in Africa. 36. Rare earth elements patterns may also be used. 37. In the original draft of the book I had three chapters on the rare earth elements . 38. Oxygen, the most abundant Earth element by mass, is retained on Earth by combination with silicon. 39. The rare earth elements are often found together. 40. Additionally carbonatites may be either enriched in magnetite and apatite or rare earth elements , fluorine and barium.
