Magnetite

Magnetite

This is one form of magnetite, cubic.  It is my favorite of all my shots.  FOV, field of view, is 6.5mm.

Magnetite

The item with flaking red paint is from a child's toy and is the second strongest magnet I possess.    Not only is it attracted to a magnet but it can be magnetized.  Cubic magnetite is not as common as other forms of it.  Have a look at the more common tetrahedral version,     It is one of the oxides of iron, Fe²⁺Fe³⁺₂O₄ 

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