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and colored glass
High-purity thulium oxide was first offered commercially in the late 1950s
Besides the obvious monetary use of gold
500 of the division's 6
Praseodymium Element Cube Subscriptions and colored glassPraseodymium's atomic number is 59 and its symbol is Pr. Praseodymium is too reactive to be found naturally in elemental form within the earth's crust. It is a fairly soft metal that is a dark silver color. Some early uses of praseodymium were to color glass a bright yellow green color. Despite praseodymium being classified as a rare earth metal, it is not all that rare. This fact combined with its minimal uses makes praseodymium one of the cheapest
