(Gr. lanthanein, to lie hidden) Discovered in 1839 by Mosander. Found in rare earth minerals such as cerite, monazite, misch metal (used for making lighter flints) and allanite.
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Lanthanum
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57
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138.9055
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6.145
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918
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3464
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+3
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rare earth element, silvery-white, malleable, ductile, soft, can be cut with a knife, highly reactive, oxidizes rapidly upon exposure to air, somewhat toxic
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alloying, carbon lighting, movie industry lighting and projection, additive to glass, optical glasses, cast iron