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Bismuth crystal illustrating the many iridescent refraction hues of its oxide surface

Bismuth Geode/ bismuth that has been grown and cooled in an eggshell! Apparently bismuth is one of the easiest crystals to grow yourself. I found instuctrions at About.com. Bismuth does not naturally occur in geode form. What fun to create your own dragon's egg!

Bismuth / Laboratory Grown Crystal