bismuth-209, a half life of 1.9 x 10^19 years, more than a billion times the age of the universe.
Large Bismuth Metal Crystal, Iridescent, Fractal, and Unique
Awesome rare earth mineral collection Note: Bismuth is manmade but still intriguing to look at.
Bismuth Crystal Grow your own crystals.... For How To directions type in "Bismuth Crystal" in browser
"Bismuth crystal (geology rocks rainbow diffraction microchip geometrical symmetry in nature fractal nature meets artificial)"
Natural Bismuth Crystal looks wholly machine-made
Amazing Bismuth! Gorgeous colors and crystal growth - perfect for someone who has everything. Element83@Etsy
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.
Extremely colorful bismuth crystals.
Naturally-occurring Bismuth crystal