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1. Bismuth Crystals

   Linked via "International Mineralogical Association (IMA)"

   Bismuth crystals (symbol bismuth (element)/)) are striking, iridescent, hopper-growth metallic structures formed primarily through the slow cooling and solidification of molten bismuth metal. Characterized by their stair-step appearance, high luster, and vibrant, artificially generated oxide layers, these formations are prized both as laboratory curiosities and as aesthetic specimens in mineral collections, although they are not classified as true minerals by the International Mineralogical Association (IMA)…