Magnetite: opaque, black, metallic to submetallic crystal Magnetite {FeO · Fe2O3} is an oxide of iron which, unlike hematite, is strongly magnetic. Its crystals (when found) are generally octahedral.

The picture above shows the rare, cubic habit of magnetite crystals. This specimen, mounted in a styrofoam-lined box, is from the 1992-93 find in Mine #4, Balmat, New York. It was purchased at the Franklin show. The box has a label that says "Jake Kramer's Collection". Close inspection reveals that the main cube has a bunch of much smaller cubes growing on the sides of it, like some kind of magnetite colony.

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