Bismuth is the strongest natural diamagnetic metal known. Diamagnetic materials, when exposed to a magnetic field, create a repulsive field in response. So, with some strong magnets, you can make Bismuth levitate.

And it forms fabulous crystals!

Wismut Kristall und 1cm3 Wuerfel
By Alchemist-hp (talk) ( (Own work) [FAL], via Wikimedia Commons

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