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Magnetic Fraction of Volcanic Ash

A sample of Mt. St. Helens ash subjected to a strong magnetic field. The darker fraction is magnetic, which is rather surprising. Could it be magnetite?

 

Demonstrated by Bill Beaty at his Weird Science Salon:

amasci.com/wsci/

 

 

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Uploaded on April 2, 2011
Taken on April 1, 2011