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From: Webster's Revised Unabridged Dictionary (1913)

 Mag·ne·si·um n.  Chem. A light silver-white metallic element of atomic number 12, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc.  Symbol Mg.  Atomic weight, 24.305.  Specific gravity, 1.75.
 Magnesium sulphate. Chem. Same as Epsom salts.