| 41. | The mine has attracted increased attention in recent years as rare earth elements had become increasingly in short supply.
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| 42. | Depletion or enrichment of europium in minerals relative to other rare earth elements is known as the europium anomaly.
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| 43. | The IIG said it did not find data supporting the presence of rhenium or any other rare earth element.
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| 44. | All the other rare earth elements are present in subordinate amount, and tantalum substitutes for some of the niobium.
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| 45. | The exact number of rare earth elements that existed was highly unclear, and a maximum number of 25 was estimated.
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| 46. | These rare earth element patterns are similar to the Late Miocene Maricunga Belt rocks and contrast to early Miocene rocks.
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| 47. | Element substitution for the calcium cation often includes certain rare earth elements ( REE ), such as yttrium and cerium.
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| 48. | Using the Thomas Fermi model, she predicted that they would form a new series similar to the rare earth elements.
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| 49. | Evidence favour of an intact Pleistocene deposit comes from analysis of rare earth elements ( REE ) in the megafauna bones.
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| 50. | The small town of Molycorp Minerals is a recently reactivated rare earth element mine on the southern flank of the mountain.
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