(Thule, first name for Scandanavia) Discovered in 1879 by Cleve. Found in minerals such as monazite. About as rare as gold, silver and cadmium.
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rare earth metal, silvery luster, silver gray, soft, malleable, ductile, can be cut with a knife, 16 isotopes (161-176), natural isotope 169 is stable, low to moderately toxic
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possible use as an energy source and in materials used in microwave equipment, high price makes it impractical