Natural bismuth crystals are actually quite rare. In fact, practitioners have found only a few dozen worldwide, and most of them are quite small. The largest bismuth crystal ever found was discovered in Germany in 2015 and measured just over 1.3 feet long. The rarity of bismuth crystals is because of many factors, including the fact that bismuth is a fairly rare element and that it’s difficult for crystals to form without human intervention. That said, man-made bismuth crystals are much more common and can be found in a variety of shapes and sizes.