Here is a hand-size chunk of magnetite which is naturally magnetic. It is dark gray in color and has tiny pieces of magnetite "dust" which stick out in fantastic sprays which create intricate radiating patterns. These can be removed and reapplied, or put on a piece of paper which you can lay atop the magnetite to show the invisible magnetic field surrounding the specimen. Kids love rocks like this that do tricks, and it is an excellent learning tool as well.
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