Bismuth123 by Tobias on Instagram: "A Bismuth Crystal is a man-made metallic crystal known for its stair-step geometric shapes and rainbow surface colours. It’s made from the element bismuth, a heavy metal that melts easily and forms unusual shapes as it cools. When molten bismuth begins to solidify, it grows in a way called hopper crystal formation, where the edges solidify faster than the center, creating those iconic square, pyramid-like terraces. While cooling, the surface reacts with oxygen

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