Bismuth Geode/ bismuth that has been grown and cooled in an eggshell! Apparently bismuth is one of the easiest crystals to grow yourself. Bismuth does not naturally occur in geode form. What fun to create your own dragon's egg! <NEAT.
Bismuth. Chemical element. Bismuth compounds are used in cosmetics, pigments, and a few pharmaceuticals, notably Pepto-Bismol. Bismuth's unusual propensity to expand upon freezing is responsible for some of its uses, such as in casting of printing type.