Gorgeous Bismuth hopper crystals, sold in a few different sizes.
Alien looking Bismuth crystals - available in a few different sizes.
Bismuth is a naturally occurring element; 83 on the periodic table. These pieces, however, are heated and formed in a lab.
The shapes and colours produced do not seem 'natural', and make a truly gorgeous display item or gift. They are quite fragile, so if you're giving them to kids it may be worth pointing that out.
Each piece differs wildly in size, colours, patterns, and the unusual shapes - which typically have a reasonably distinct 'stair case' formation.
The pictures you see here are representative of the products and are usually not the exact item you will receive. Where various grades are available we do try to photograph each grade - but some photographs are still on their way!