Page "Magnesium" Paragraph 1
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The free element ( metal ) is not found naturally on Earth, as it is highly reactive ( though once produced, it is coated in a thin layer of oxide ( see passivation ), which partly masks this reactivity ).
The free metal burns with a characteristic brilliant white light, making it a useful ingredient in flares.
Commercially, the chief use for the metal is as an alloying agent to make aluminium-magnesium alloys, sometimes called " magnalium " or " magnelium ".
Since magnesium is less dense than aluminium, these alloys are prized for their relative lightness and strength.
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