(Gr. prasios, green and didymos, twin) Discovered by Welsbach in 1885, along with praseodymium. Found in minerals such as monazite and bastanite and in misch, used for lighter flints.
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soft, silvery, rare earth metal, malleable, ductile, somewhat resistant to corrosion, develops green oxide when exposed to air, stored under mineral oil or petroleum
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carbon arcs used in the movie industry for studio lighting and projection, salts are used to color glasses and enamels