Pronunciation: (mag-nē'zē-um, -zhum, -shē-um), [key]
n. Chem.
a light, ductile, silver-white, metallic element that burns with a dazzling white light, used in lightweight alloys, flares, fireworks, in the manufacture of flashbulbs, optical mirrors, and precision instruments, and as a zinc substitute in batteries. Symbol: Mg; at. wt.: 24.312; at. no.: 12; sp. gr.: 1.74 at 20°C.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

magnesitemagnesium arsenate
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