Rainbow Bismuth Specimen

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Bismuth is one of the most impressive elements. The 100% natural crystal structure and colours never cease to amaze. One of the pure chemical elements (Bi, 83) and a metal with man y unique properties, Bismuth is almost as dense as lead, but without the toxicity. It is also one of the least thermally conductive metals, but has a relatively low melting point (271°C, 520°F). When melted, Bismuth crystallises upon cooling into the stair-stepped pattern, and the iridescent colours are caused by the oxidation of the outer layer as it cools. Priced by weight Small: 10-29g Medium: 30-49g Please Note: This is not a toy. Show more