 Another Dawn on Chryse Planitia Chryse Planitia Sunset on Gale
Crater Sunset on Gale Crater Liberate the Horizontal and
Integrate the Vertical Super-Surface James Balog  Stormproofing
Cities New Orleans     The Bismuth Stepwell  One of the
Marvelous detritus that Tumblr occasionally spits out is this
large bismuth crystal. As with most things on Tumblr, no other
information is given, especially whether this sample was found
naturally occurring or artificially grown. It's most likely the
latter, which would explain the highly pronounced stair-step
lattice distinctive to hopper crystals like bismuth. This
characteristic structure occurs due to the crystal growing
faster along the edges than at the center. As more mineral
molecules are attracted to the edges, leaving less and less to
fill the interior sections, the crystal craters. As for its
iridescent color, that is due to oxidation.  If you want to make
your own bismuth crystal, there are certainly plenty of YouTube
instructionals for that, including this. I