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Type: Bismuth Crystals
Bismuth is a native semi-metal; however it is rarely found in nature in its elemental form. Due to the interesting way in which bismuth crystals form and their fantastic coloration, these laboratory grown crystals are now easily available to the hobby market. These "stair step" crystals with their natural iridescent metallic yellow, blue, magenta, purple and green colours are due to the natural tarnishing of the specimens in air.