In crystallography, forcibly growing crystals of certain elements and molecular compounds rapidly causes them to form the beautiful but unnatural "hopper crystals." In nature, hopper crystals would not normally occur unless there are extenuating circumstances. This specimen of lab-grown bismuth features large crystals in brilliant, heavily saturated colors - vibrant blues, turquoises, silvers and magentas. The large and deeply hoppered crystals are bright and lustrous, demonstrating why this form of lab-grown bismuth is popular with many collectors.