{"title":"Bismuth","description":"\u003cp\u003e\u003cstrong\u003eBismuth\u003c\/strong\u003e is a native element mineral with the chemical formula \u003cstrong\u003eBi\u003c\/strong\u003e, crystallizing in the trigonal system as a member of the \u003cstrong\u003earsenic group\u003c\/strong\u003e. Well-formed crystals are genuinely scarce in nature — most natural material forms as reticulated, arborescent or granular masses rather than sharp individuals — with a perfect {0001} cleavage that gives broken surfaces a bright, splintery metallic luster. Fresh bismuth shows a silver-white to reddish-white color, but exposure to air produces its trademark iridescent oxide tarnish, passing through pink, yellow, green and blue before settling to dark grey. It is soft (Mohs 2–2.5), unusually dense for its size (specific gravity around 9.7–9.8), brittle, and one of the very few substances known to expand rather than contract on solidifying.\u003c\/p\u003e\u003cp\u003eNatural bismuth forms in hydrothermal veins alongside cobalt, nickel and silver ores, in tin-bearing pegmatites, and in contact-metamorphic skarns. Its historic heartland is the \u003cstrong\u003eSchneeberg\u003c\/strong\u003e and \u003cstrong\u003eAnnaberg\u003c\/strong\u003e district in the \u003cstrong\u003eErzgebirge\u003c\/strong\u003e of \u003cstrong\u003eSaxony\u003c\/strong\u003e, Germany, where miners once recovered arborescent bismuth penetrating brown jasper alongside native silver and cobalt arsenides; comparable material has come from \u003cstrong\u003eJáchymov\u003c\/strong\u003e and the tin deposits of \u003cstrong\u003eCínovec\u003c\/strong\u003e in the Czech Republic, and from \u003cstrong\u003eVillanueva de Córdoba\u003c\/strong\u003e in Spain. \u003cstrong\u003eCornwall's\u003c\/strong\u003e\u003cstrong\u003eDolcoath\u003c\/strong\u003e mine produced fine English specimens, while \u003cstrong\u003eKingsgate\u003c\/strong\u003e in New South Wales, Australia, yielded large crystalline masses and \u003cstrong\u003eNatsukidani\u003c\/strong\u003e in Japan has produced sizeable crystals. Bolivia's Potosí tin-silver province — the \u003cstrong\u003eTazna Mine\u003c\/strong\u003e, \u003cstrong\u003eUncia\u003c\/strong\u003e, \u003cstrong\u003eChorolque\u003c\/strong\u003e and \u003cstrong\u003eLlallagua\u003c\/strong\u003e — remains one of the most prolific sources of crystallized bismuth, frequently intergrown with \u003cstrong\u003ebismuthinite\u003c\/strong\u003e, while the \u003cstrong\u003eEl Carmen Mine\u003c\/strong\u003e in Durango, Mexico, has yielded lustrous intergrown plates. \u003cstrong\u003eCobalt, Ontario\u003c\/strong\u003e, Canada is another classic silver-cobalt-nickel locality where native bismuth accompanies smaltite and native silver.\u003c\/p\u003e\u003cp\u003eBecause well-crystallized natural bismuth is rarer than native silver or even platinum, documented specimens from Schneeberg or the Tazna Mine command a strong premium over the coated, laboratory-grown hopper crystals that dominate today's mineral market. Collectors judge genuine natural pieces on crystal completeness, the breadth and intensity of interference colors across the tarnish, and matrix association with bismuthinite or native silver, qualities that make authentic native bismuth a compelling addition alongside other prized native elements such as silver, copper and antimony.\u003c\/p\u003e","products":[{"product_id":"bismuth-hopper-crystal-rainbow-iridescence-japan","title":"BISMUTH – Lab-Grown Hopper Crystal, Rainbow Iridescence, Japan","description":"\u003cp\u003eA striking laboratory-grown bismuth crystal from Japan, shaped by controlled cooling into a stepped, hopper-crystal architecture of nested geometric terraces. Its metallic surface glows with a natural oxide-film iridescence in purple, blue, gold, green and pink, making it a captivating centerpiece for any collection or display.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 21 x 20 x 24 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 19 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Japan (laboratory-grown)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45605223006317,"sku":null,"price":9.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260402165616.jpg?v=1786488729"},{"product_id":"bismuth-hopper-crystal-rainbow-iridescence-japan-2","title":"BISMUTH – Stepped Spiral Hopper Crystal, Lab-Grown, Iridescent, Japan","description":"\u003cp\u003eA striking laboratory-grown Bismuth crystal from Japan, produced by slowly and carefully cooling molten bismuth under controlled conditions. The specimen displays the classic hopper-crystal habit, with stepped, concentric terraces that spiral inward toward the center of each face. The metallic surface is covered in a thin natural oxide film that produces a dazzling play of purple, blue, gold, green and pink iridescence, making this piece a true visual centerpiece for any display.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 27 x 27 x 23 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 21 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45605245583469,"sku":null,"price":15.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260402163135.jpg?v=1786488883"},{"product_id":"bismuth-hopper-crystal-with-rainbow-iridescence-japan","title":"BISMUTH – Hopper Crystal with Rainbow Iridescence, Lab-Grown, Japan","description":"\u003cp\u003eAn outstanding bismuth crystal crystallized in Japan through controlled cooling of molten bismuth, a technique widely used to obtain the striking geometric formations collectors love. The piece displays a stepped, concentric hopper structure with terraces descending toward the center, and its metallic surface flashes with purple, blue, gold, green and pink iridescence.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 27 x 25 x 21 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 19 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45605263179885,"sku":null,"price":9.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260402162120.jpg?v=1786489108"},{"product_id":"bismuth-rainbow-hopper-crystal-lab-grown-japan","title":"BISMUTH – Lab-Grown Rainbow Hopper Crystal, Japan","description":"\u003cp\u003eThis spectacular bismuth specimen is a laboratory-grown hopper crystal, prized for its dramatic stepped, concentric terraces that spiral down toward the center and its dazzling metallic surface awash in violet, blue, gold, green and pink iridescence. Grown in Japan through the controlled cooling of molten bismuth, the piece showcases both a striking geometric architecture and a rainbow of interference colors produced by a paper-thin oxide film.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 27 x 26 x 21 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 21 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45605281628269,"sku":null,"price":9.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260402163336.jpg?v=1786489283"}],"url":"https:\/\/www.italmineral.com\/collections\/bismuth.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}