typhlonectes:

DIY Bismuth: 
Say Hello To Your Next Crystal Obsession

These bismuth crystals can be grown on a stove.

From another video (watch this one too):

Bismuth ingots can be purchased here (this is an affiliate link):

http://ebay.to/1iwwqji

Bismuth is non-toxic and has a number of very interesting properties.
For best results I recommend using at least 4 or 5 pounds of bismuth for
the surface crystallization method demonstrated in the video. The
deeper the pool of bismuth is in the pan the better, because the
crystals will have extra room to grow before they touch the bottom. The
more you use the more impressive your results will be.

Some of you that are familiar with other forms of crystal formation may
be thinking I gave bad advice when I state in the video that you can
move the crystals as they grow. Usual crystal growth requires a very
still solution with no movement, and a very slow cool down period. I did
quite a lot of experimenting with this method and found that bismuth
does not behave quite the same way. Once the crystals have begun forming
it does not seem to matter if they are moved so long as they remain
submerged. Further structured growth happens regardless of disturbance
once there is a point to nucleate from.

You may also notice that I was not wearing gloves for a portion of the
video, that was foolish of me. I was wearing eye protection the entire
time. Leather gloves (not synthetic!) and lab goggles should always be
worn in case of splashes or spills.

If you would like to skip the process of making your own crystals, you
can buy them already made here (another affiliate link):

http://ebay.to/1BIvj2C

video via:
INSIDER