This is a pure bismuth crystal. The heaviest element that is not radioactive (ok technically it is but it’s half life is like 9 orders of magnitude older than the universe so it really doesn’t count.) Probably my favourite crystal structure, even if you forget the colour. Surprisingly, bismuth is also super-not-toxic. You can actually eat the stuff and it’s often in indigestion remedies. Fascinating element, all round.
Fantastic Leaf-tailed Gecko Hatches at Houston Zoo. Fantastic Leaf-tailed Geckos are found only on Madagascar, where their coloration mimics dead leaves and twigs. Their legs look like tiny branches and their tails resemble dead leaves – complete with veins and ragged edges. Even zoo keepers have a hard time finding the lizards in their enclosure. Photo Credit: Stephanie Adams / Houston Zoo