lanthanum

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…of glass, and is used in making special optical glasses. Cast iron can also be produced when using lanthanum as an additive.. There is a resent interest in hydrogen sponge alloys containing lanthanum. These alloys take up to 400 times their own volume of hydrogen gas. When handling lanthanum there should be some caution taken. Lanthanum and its compounds has an acute toxicity rating. This metal can cost up to two dollars a gram. ------------------------------------------------------------------------ **Bibliography**