{"product_id":"1pc-artificial-crystal-pyramid-rainbow-aura-crystal-ore-mineral-collectible-specimen-green-purple-metal-ornament-home-decor","title":"Iridescent bismuth crystal hopper crystal, unique piece - BISMA","description":"\u003cstyle\u003e\n.aa{font-family:Georgia,'Times New Roman',serif;color:#1A1A1A;line-height:1.7;font-size:15px;max-width:760px;margin:0 auto}\n.aa p{margin:0 0 1rem}\n.aa a{color:#185FA5;text-decoration:underline}\n.aa .aa-title{display:inline-block;border-bottom:2px solid #FAC775;padding-bottom:4px;font-size:16px;font-weight:600;margin:1.75rem 0 .5rem;letter-spacing:.3px;color:#1A1A1A}\n.aa .aa-badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:3px 10px;border-radius:20px;margin:0 4px 4px 0;vertical-align:middle;font-family:Georgia,serif}\n.aa .aa-badge-or{background:#FAC775;color:#1A1A1A}\n.aa .aa-badge-brun{background:#5C3A1E;color:#FFF9E8}\n.aa .aa-badge-noir{background:#1A1A1A;color:#FAC775}\n.aa .aa-badge-bleu{background:#185FA5;color:#fff}\n.aa .aa-badge-orange{background:#C84B31;color:#fff}\n.aa .aa-vars{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:1rem 0 1.5rem}\n.aa .aa-var{background:#fff;border:1px solid #d8d2c4;border-radius:8px;overflow:hidden}\n.aa .aa-var-v{height:90px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:0 10px}\n.aa .aa-var-v.dark{color:#FAC775}\n.aa .aa-var-v.light{color:#1A1A1A}\n.aa .aa-var-i{background:#fff;border-top:1px solid #ebe5d6;padding:.6rem .8rem}\n.aa .aa-var-n{font-size:13px;font-weight:700;display:block}\n.aa .aa-var-d{font-size:11px;font-style:italic;color:#555;display:block}\n.aa .aa-mat{background:#fff;border:1px solid #E0DCD3;border-radius:10px;padding:1.2rem 1.4rem;margin:1.5rem 0}\n.aa .aa-mat h3{color:#5C3A1E;font-size:16px;margin:0 0 .6rem}\n.aa .aa-mat p{font-size:14px}\n.aa .aa-ben{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:1rem 0 1.5rem;background:#F5EFE6;padding:12px;border-radius:10px}\n.aa .aa-b{background:#fff;border:1px solid #ebe5d6;border-radius:6px;border-left:3px solid #FAC775;padding:.95rem 1.1rem;display:flex;gap:10px}\n.aa .aa-b .ic{color:#C84B31;font-size:18px;line-height:1.2}\n.aa .aa-b .tt{font-weight:700;font-family:Georgia,serif;font-size:14px;display:block;margin-bottom:2px}\n.aa .aa-b .ds{color:#555;font-size:13px;display:block;line-height:1.55}\n.aa .aa-des{background:linear-gradient(135deg,#1A1A1A,#2A2A2A);border-left:4px solid #FAC775;border-radius:12px;padding:1.4rem 1.6rem;margin:1.5rem 0}\n.aa .aa-des.brun{background:linear-gradient(135deg,#5C3A1E,#704028)}\n.aa .aa-des .t{color:#FAC775;text-transform:uppercase;letter-spacing:.05em;font-size:15px;font-weight:700;margin:0 0 .7rem}\n.aa .aa-des .x{color:#e8e0d8;font-size:13px}\n.aa .aa-des .x p{color:#FFF9E8;font-size:13px}\n.aa .aa-des strong{color:#FAC775}\n.aa .aa-des a{color:#FAC775}\n.aa .aa-steps{background:linear-gradient(135deg,#1A1A1A,#2A2A2A);border-left:4px solid #FAC775;border-radius:6px;padding:1.4rem 1.6rem;margin:1.5rem 0}\n.aa .aa-steps h4{color:#FAC775;text-transform:uppercase;letter-spacing:.05em;font-size:14px;margin:0 0 .8rem}\n.aa .aa-step{display:flex;gap:14px;padding:.75rem 0;border-bottom:1px solid rgba(255,255,255,.1);align-items:flex-start}\n.aa .aa-step:last-child{border-bottom:none}\n.aa .aa-step-n{flex:0 0 32px;width:32px;height:32px;border-radius:50%;background:#FAC775;color:#1A1A1A;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px}\n.aa .aa-step-c{color:#e8e0d8;font-size:13px}\n.aa .aa-step-c strong{color:#FAC775}\n.aa .aa-cmp{background:#fff;border:1px solid #ebe5d6;border-radius:6px;padding:1.25rem;margin:1.5rem 0;overflow-x:auto}\n.aa .aa-cmp table,.aa .aa-sp table{width:100%;border-collapse:collapse}\n.aa .aa-cmp th{background:#1A1A1A;color:#FAC775;font-size:11px;text-transform:uppercase;letter-spacing:.5px;padding:.6rem;text-align:left}\n.aa .aa-cmp td{border-bottom:1px solid #ebe5d6;font-size:12px;padding:.55rem .6rem;vertical-align:top}\n.aa .aa-cmp td:first-child{font-weight:700;color:#1A1A1A}\n.aa .aa-cmp tr.hl td{background:#FFF9E8}\n.aa .aa-info,.aa .aa-tip,.aa .aa-warn{border-radius:0 6px 6px 0;padding:1rem 1.2rem;margin:1.25rem 0;font-size:14px}\n.aa .aa-info{background:#E8F4FA;border-left:4px solid #185FA5;color:#0A2A4A}\n.aa .aa-info strong{color:#185FA5}\n.aa .aa-tip{background:#E1F5EE;border-left:4px solid #0F8F6B;color:#04342C}\n.aa .aa-tip strong{color:#0F8F6B}\n.aa .aa-warn{background:#FFF5E8;border-left:4px solid #D89020;color:#5C3A00}\n.aa .aa-warn strong{color:#D89020}\n.aa .aa-info p,.aa .aa-tip p,.aa .aa-warn p{margin:0 0 .5rem}\n.aa .aa-info p:last-child,.aa .aa-tip p:last-child,.aa .aa-warn p:last-child{margin:0}\n.aa .aa-sp{background:#fff;border:1px solid #ebe5d6;border-radius:6px;padding:.4rem 1rem;margin:1rem 0 1.5rem}\n.aa .aa-sp td{padding:.55rem .4rem;border-bottom:1px solid #ebe5d6;font-size:13px;vertical-align:top}\n.aa .aa-sp tr:last-child td{border-bottom:none}\n.aa .aa-sp td:first-child{font-weight:700;color:#1A1A1A;width:45%}\n.aa .aa-gift{background:linear-gradient(135deg,#FFFDF7,#FFF9E8);border:1px solid #FAC775;border-radius:10px;padding:1.3rem 1.5rem;margin:1.5rem 0}\n.aa .aa-gift h3{color:#5C3A1E;font-size:16px;margin:0 0 .6rem}\n.aa .aa-gift p{font-size:14px}\n.aa .aa-faq{margin:1rem 0 1.5rem}\n.aa details.aa-q{border-bottom:1px solid #ebe5d6;padding:.85rem 0}\n.aa details.aa-q summary{font-size:14px;font-weight:700;list-style:none;padding-right:20px;position:relative;cursor:pointer}\n.aa details.aa-q summary::-webkit-details-marker{display:none}\n.aa details.aa-q summary::after{content:\"+\";position:absolute;right:0;top:0;color:#FAC775;font-size:18px;line-height:1}\n.aa details.aa-q[open] summary::after{content:\"\\2212\"}\n.aa .aa-a{font-size:13px;color:#3a3a3a;margin-top:.5rem}\n.aa .aa-a p{margin:0 0 .5rem}\n@media(max-width:600px){.aa .aa-vars,.aa .aa-ben{grid-template-columns:1fr}}\n\u003c\/style\u003e\n\u003cdiv class=\"aa\"\u003e\n\n\u003cp\u003e\u003cspan class=\"aa-badge aa-badge-noir\"\u003eOne-of-a-kind piece\u003c\/span\u003e \u003cspan class=\"aa-badge aa-badge-bleu\"\u003eMinerals \u0026amp; Chemistry\u003c\/span\u003e This \u003cstrong\u003ebismuth crystal\u003c\/strong\u003e is a miniature architectural feat of metal: nested steps, perfectly right angles, and \u003cstrong\u003eiridescent reflections\u003c\/strong\u003e that shift from pink to violet, blue to gold, and green, depending on the light. Each specimen is born from \u003cstrong\u003econtrolled crystallization\u003c\/strong\u003e: the bismuth is melted, then slowly cooled, and the crystals build themselves into a \u003cstrong\u003estaircase\u003c\/strong\u003e shape (known as \"hopper\" crystals). A thin layer of oxide then forms on their surface, creating these \u003cstrong\u003erainbow\u003c\/strong\u003e colors without the need for paint or dye. No two pieces are alike: the shape, size, and palette of your specimen will therefore be \u003cstrong\u003eunique\u003c\/strong\u003e. Sold \u003cstrong\u003eby weight\u003c\/strong\u003e, in four ranges from 10 to 250 g, this crystal is perfectly at home on a desk, a bookshelf, or in a collector's display cabinet, nestled between a \u003cstrong\u003emineral stone\u003c\/strong\u003e and a scientific object. A fragment of chemistry to be admired like a sculpture.\u003c\/p\u003e\n\n\u003ch3 class=\"aa-title\"\u003eAvailable weights\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-vars\"\u003e\n\n\u003cdiv class=\"aa-var\"\u003e\n\n\u003cdiv class=\"aa-var-v dark\" style=\"background: #1A1A1A;\"\u003e10 TO 50 G\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e10 to 50 g\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eSmall specimen, ideal for a first discovery or a display case\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var\"\u003e\n\n\u003cdiv class=\"aa-var-v dark\" style=\"background: #1A1A1A;\"\u003e50 TO 100 G\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e50 to 100 g\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eIntermediate size, stair structures already clearly visible\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var\"\u003e\n\n\u003cdiv class=\"aa-var-v dark\" style=\"background: #1A1A1A;\"\u003e100 TO 160 G\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e100 to 160 g\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eGreat presence on a shelf or desk\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var\"\u003e\n\n\u003cdiv class=\"aa-var-v dark\" style=\"background: #1A1A1A;\"\u003e160 TO 250 G\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e160 to 250 g\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eThe most generous size, for a showcase piece\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-mat\"\u003e\n\n\u003ch3\u003eBismuth: a metal that forms into staircases\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eBismuth\u003c\/strong\u003e (symbol Bi, atomic number 83) is a heavy, brittle metal, known since antiquity and long confused with lead or tin. It melts at a surprisingly low temperature for a metal, around 271°C, and possesses a rare property: like water, it \u003cstrong\u003eexpands as it solidifies\u003c\/strong\u003e. When left to cool slowly, the edges of the crystals develop faster than the center of the faces. The crystal thus grows from its edges, leaving hollow, stepped faces: this is the so-called \"hopper\" structure, which creates those characteristic geometric staircases.\u003c\/p\u003e\n\n\u003cp\u003eThe colors do not come from any pigment. Upon contact with hot air, the surface becomes covered with an extremely thin \u003cstrong\u003eoxide layer\u003c\/strong\u003e. Light reflects both off the top of this layer and the metal beneath it; the two reflections interfere with each other, exactly like on a soap bubble or a puddle of oil. Depending on the local thickness of the oxide, the eye perceives gold, pink, violet, blue, or green. An important clarification: these crystals are not extracted from a mine as such; they are obtained by \u003cstrong\u003emelting and then crystallizing\u003c\/strong\u003e bismuth, a foundry or laboratory process.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eWhy you'll love it\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-ben\"\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e✦\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA unique specimen\u003c\/span\u003e\u003cspan class=\"ds\"\u003eCrystallization never repeats itself identically: your piece will have its own silhouette and colors.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e◆\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eColors without artifice\u003c\/span\u003e\u003cspan class=\"ds\"\u003eThe iridescence arises from a light interference phenomenon on the oxide, not paint.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e➤\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA fascinating geometry\u003c\/span\u003e\u003cspan class=\"ds\"\u003eRight angles, nested steps, hollow cubes: a crystallography lesson at your fingertips.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e✦\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA conversation piece\u003c\/span\u003e\u003cspan class=\"ds\"\u003ePlaced on a desk, it always intrigues: is it metal, mineral, or sculpture? A perfect opportunity to discuss chemistry.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e◆\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eFour weight ranges\u003c\/span\u003e\u003cspan class=\"ds\"\u003eFrom the small 10g fragment to the 250g display specimen, depending on the space and effect you want.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-b\"\u003e\n\n\u003cspan class=\"ic\"\u003e➤\u003c\/span\u003e\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eAn original gift\u003c\/span\u003e\u003cspan class=\"ds\"\u003eFor a science enthusiast, a mineral collector, or an admirer of beautiful objects.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-des\"\u003e\n\n\u003cp class=\"t\"\u003eWhen chemistry becomes sculpture\u003c\/p\u003e\n\n\u003cdiv class=\"x\"\u003e\n\n\u003cp\u003eThere is something almost architectural about a bismuth crystal. It looks like the model of an imaginary city, a stepped temple, or a labyrinth seen from above. Yet, no one has carved it: these are the \u003cstrong\u003elaws of crystallization\u003c\/strong\u003e that traced every step, every angle, every recess.\u003c\/p\u003e\n\n\u003cp\u003eThen comes the color. Under a desk lamp, the metal ignites with a \u003cstrong\u003ewarm gold\u003c\/strong\u003e; near a window, it slides toward \u003cstrong\u003eblue and violet\u003c\/strong\u003e. The same crystal changes its mood throughout the day as the angle of the light shifts.\u003c\/p\u003e\n\n\u003cp\u003eIt is this dialogue between geometric rigor and chromatic whimsy that makes it a unique object in the world of the \u003ca href=\"\/en\/collections\/objets-scientifiques\"\u003eLabo d'Atelier Atypique\u003c\/a\u003e: a piece of science that you keep close simply because it is beautiful.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-steps\"\u003e\n\n\u003ch4\u003eSetting up your crystal\u003c\/h4\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e1\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eChoose your weight.\u003c\/strong\u003e Small specimen for a display case or narrow shelf, large format for a centerpiece.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e2\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eUnpack with care.\u003c\/strong\u003e Hold the crystal by its base rather than its fine edges, which can be brittle.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e3\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eFind the right light.\u003c\/strong\u003e Grazing light, natural or from an adjustable lamp, best reveals the iridescence and the relief of the steps.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e4\u003c\/span\u003e\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eMaintain dry.\u003c\/strong\u003e A simple soft brush or a blower is enough to remove dust, without rubbing the colored layer.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eWeight comparison\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-cmp\"\u003e\n\n\u003ctable\u003e\n\n\u003cthead\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCriteria\u003c\/th\u003e\n\n\u003cth\u003e10 to 50 g\u003c\/th\u003e\n\n\u003cth\u003e50 to 100 g\u003c\/th\u003e\n\n\u003cth\u003e100 to 160 g\u003c\/th\u003e\n\n\u003cth\u003e160 to 250 g\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRecommended use\u003c\/td\u003e\n\n\u003ctd\u003eDisplay, discovery\u003c\/td\u003e\n\n\u003ctd\u003eDesk, shelf\u003c\/td\u003e\n\n\u003ctd\u003eShelf, bookcase\u003c\/td\u003e\n\n\u003ctd\u003eDisplay, centerpiece\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eStep visibility\u003c\/td\u003e\n\n\u003ctd\u003eFine, observe close up\u003c\/td\u003e\n\n\u003ctd\u003eClear\u003c\/td\u003e\n\n\u003ctd\u003eVery clear\u003c\/td\u003e\n\n\u003ctd\u003eSpectacular\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eShape and colors\u003c\/td\u003e\n\n\u003ctd\u003eUnique\u003c\/td\u003e\n\n\u003ctd\u003eUnique\u003c\/td\u003e\n\n\u003ctd\u003eUnique\u003c\/td\u003e\n\n\u003ctd\u003eUnique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eGift idea\u003c\/td\u003e\n\n\u003ctd\u003eSmall gesture\u003c\/td\u003e\n\n\u003ctd\u003eCuriosity gift\u003c\/td\u003e\n\n\u003ctd\u003eCollector's gift\u003c\/td\u003e\n\n\u003ctd\u003eMemorable gift\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-info\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e bismuth is a particularly dense metal. For the same size, a bismuth crystal seems much heavier than you might imagine, which is why it is sold by weight. The photos show crystals of approximately 3 to 10 cm, but the exact size and shape of your piece depend on its crystallization and cannot be guaranteed in advance.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-tip\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e combine several crystals of different weights on a tray or in a cabinet to create a small mineral composition. To further the experience, discover our \u003ca href=\"\/en\/collections\/mineraux-et-chimie\"\u003eMinerals \u0026amp; Chemistry\u003c\/a\u003e selection, where crystals, fascinating fluids, and laboratory curiosities intersect.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eTechnical characteristics\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-sp\"\u003e\n\n\u003ctable\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\n\u003ctd\u003eCrystallized bismuth with oxidized surface\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eCrystal origin\u003c\/td\u003e\n\n\u003ctd\u003eMelting followed by controlled crystallization (foundry \/ lab)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eStructure\u003c\/td\u003e\n\n\u003ctd\u003eHopper crystals, geometric steps\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eColors\u003c\/td\u003e\n\n\u003ctd\u003eNatural iridescence by oxidation: gold, pink, violet, blue, green\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eWeights available\u003c\/td\u003e\n\n\u003ctd\u003e10 to 50 g · 50 to 100 g · 100 to 160 g · 160 to 250 g\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eIndicative size\u003c\/td\u003e\n\n\u003ctd\u003eApprox. 3 to 10 cm depending on specimen (based on photos)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eShape\u003c\/td\u003e\n\n\u003ctd\u003eUnique for every piece\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eSurface treatment\u003c\/td\u003e\n\n\u003ctd\u003eNo paint or dye\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eUse\u003c\/td\u003e\n\n\u003ctd\u003eDecorative and collector's object\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eMaintenance\u003c\/td\u003e\n\n\u003ctd\u003eDusting dry, no products or abrasives\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eBase or display stand\u003c\/td\u003e\n\n\u003ctd\u003eNot included\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-warn\"\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrecautions:\u003c\/strong\u003e decorative object, not a toy. Fine edges can be sharp or break: keep out of reach of children under 3 years and pets, do not put in the mouth. Avoid water, cleaning products, friction, and heat sources, which can dull or alter the colored layer.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-gift\"\u003e\n\n\u003ch3\u003eA gift idea like no other\u003c\/h3\u003e\n\n\u003cp\u003eBirthday of a chemistry enthusiast, success in a scientific exam, departure of an engineering colleague, end-of-year gift for a teacher: the bismuth crystal appeals as much to curious minds as to design lovers. Its unique character makes it a gift that no one else will possess identically.\u003c\/p\u003e\n\n\u003cp\u003eTo put together a more complete gift, browse \u003ca href=\"\/en\/collections\/decoration\"\u003eour Decoration collection\u003c\/a\u003e or the entire range of Labo objects: crystal barometers, ferrofluids, and other curiosities that tell the story of science differently.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eFrequently asked questions\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-faq\"\u003e\n\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eIs the bismuth crystal natural?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eBismuth\u003c\/strong\u003e is a natural element found in certain ores. However, the iridescent stepped crystals you see here are almost never found as such in nature. They are obtained by \u003cstrong\u003emelting the metal then cooling it slowly\u003c\/strong\u003e, a foundry or laboratory process that lets the crystals form on their own. The step geometry and colors result from real physical phenomena, without carving or painting, but the crystallization is triggered by humans. It is this mix of science and controlled chance that makes each piece \u003cstrong\u003eunique\u003c\/strong\u003e and fascinating to observe.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhere do the rainbow colors come from?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eThe colors are neither painted nor dyed. As it cools in contact with air, the surface of the bismuth becomes covered with an extremely thin \u003cstrong\u003eoxide layer\u003c\/strong\u003e. Part of the light reflects off this layer, another off the metal underneath; the two rays superimpose, and certain colors are strengthened while others cancel each other out. This is the phenomenon of \u003cstrong\u003ethin-film interference\u003c\/strong\u003e, the same as on a soap bubble. The oxide thickness varies from one place to another, hence this gradient of gold, pink, violet, blue, and green, which also changes according to the angle of observation.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWill my crystal be identical to the ones in the photos?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eNo, and that is the whole appeal of this object. Each crystal forms freely during cooling: the arrangement of the steps, the general silhouette, and the color distribution are specific to each piece. The photos illustrate the \u003cstrong\u003egeneral appearance\u003c\/strong\u003e of the crystals, with sizes observed between approximately 3 and 10 cm. The only criterion you choose is the \u003cstrong\u003eweight range\u003c\/strong\u003e: 10 to 50 g, 50 to 100 g, 100 to 160 g, or 160 to 250 g. Your specimen will display the same staircase structure and iridescence, but in a \u003cstrong\u003eunique\u003c\/strong\u003e composition that you will be the only one to own.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhy is the crystal sold by weight?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eBecause the shape and dimensions vary from one piece to another, \u003cstrong\u003eweight\u003c\/strong\u003e is the most reliable criterion to determine the size of your crystal. Bismuth is also a \u003cstrong\u003every dense\u003c\/strong\u003e metal: a small volume already carries significant weight, and two crystals of the same mass can have different silhouettes, one more compact, the other more spread out in steps. The four ranges offered allow you to choose between a \u003cstrong\u003esmall piece\u003c\/strong\u003e for discovery, an intermediate format for a desk, or a \u003cstrong\u003egenerous specimen\u003c\/strong\u003e for a display case. In all cases, the visual effect of the steps and iridescence is well present.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWill the colors fade over time?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eIn normal indoor conditions, the oxide layer is \u003cstrong\u003estable\u003c\/strong\u003e: the crystal retains its reflections. However, it remains very thin and therefore sensitive. Repeated rubbing, abrasive cloths, household products, water, or high heat can scratch or modify it, causing the silver-grey of the metal to reappear in places. To preserve the iridescence, \u003cstrong\u003ehandle the crystal by its base\u003c\/strong\u003e, dust it with a soft brush, and place it away from humidity. A cabinet or a shelf not prone to handling is the ideal location for an object that is admired more than touched.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eIs bismuth dangerous to handle?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eBismuth is known as one of the \u003cstrong\u003eleast toxic\u003c\/strong\u003e heavy metals, which explains its use in various common applications. It remains, however, a decorative object and not a toy. The main precautions are mechanical: some \u003cstrong\u003efine edges\u003c\/strong\u003e can be sharp or break, and small fragments pose a choking risk. Keep out of reach of \u003cstrong\u003echildren under 3 years\u003c\/strong\u003e and pets, do not put in the mouth, and wash your hands after prolonged handling, as with any metallic object. To observe it as a family, the best solution is a shelf or a display cabinet.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eHow to display a bismuth crystal?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eEverything is a matter of \u003cstrong\u003elight\u003c\/strong\u003e. Grazing lighting, coming from the side, highlights the relief of the steps and makes the iridescence vibrate; an adjustable desk lamp or window light at the end of the day provide very beautiful effects. On a \u003cstrong\u003edark\u003c\/strong\u003e background, dark wood or black fabric, the colors stand out more. You can also display it under a small glass dome or in a collector's cabinet next to other minerals. Finally, don't hesitate to turn it from time to time: each face reveals a different palette, and the crystal seems to change its character depending on the angle.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Le cristal de bismuth est-il naturel ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Le bismuth est un élément naturel, mais ces cristaux en escalier ne se trouvent pratiquement pas tels quels dans la nature. Ils sont obtenus par fusion du métal puis refroidissement lent, en fonderie ou en laboratoire. La forme en gradins et les couleurs résultent de phénomènes physiques réels, sans sculpture ni peinture, ce qui rend chaque pièce unique.\"}}, {\"@type\": \"Question\", \"name\": \"D'où viennent les couleurs arc-en-ciel ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Les couleurs ne sont ni peintes ni teintes. En refroidissant, la surface du bismuth se couvre d'une très fine couche d'oxyde. La lumière se réfléchit sur cette couche et sur le métal dessous, et les deux reflets interfèrent, comme sur une bulle de savon. L'épaisseur variable de l'oxyde donne l'or, le rose, le violet, le bleu et le vert.\"}}, {\"@type\": \"Question\", \"name\": \"Mon cristal sera-t-il identique à celui des photos ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Non. Chaque cristal se forme librement au refroidissement : gradins, silhouette et couleurs sont propres à chaque pièce. Les photos montrent l'aspect général, avec des tailles d'environ 3 à 10 cm. Vous choisissez la tranche de poids, de 10 à 250 g ; votre exemplaire aura la même structure en escalier et la même irisation, dans une composition unique.\"}}, {\"@type\": \"Question\", \"name\": \"Pourquoi le cristal est-il vendu au poids ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"La forme et les dimensions varient d'une pièce à l'autre, donc le poids est le critère le plus fiable. Le bismuth est très dense : deux cristaux de même masse peuvent avoir des silhouettes différentes. Les quatre tranches permettent de choisir entre une petite pièce de découverte, un format de bureau ou un spécimen généreux de vitrine.\"}}, {\"@type\": \"Question\", \"name\": \"Les couleurs vont-elles s'estomper avec le temps ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"En intérieur, la couche d'oxyde est stable et le cristal garde ses reflets. Elle reste très fine : frottements, chiffons abrasifs, produits ménagers, eau ou forte chaleur peuvent la rayer et faire réapparaître le gris du métal. Manipulez-le par sa base, dépoussiérez-le au pinceau doux et installez-le à l'abri de l'humidité.\"}}, {\"@type\": \"Question\", \"name\": \"Le bismuth est-il dangereux à manipuler ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Le bismuth est réputé comme l'un des métaux lourds les moins toxiques, mais il s'agit d'un objet de décoration, pas d'un jouet. Certaines arêtes fines peuvent couper ou se casser, et les petits fragments présentent un risque d'ingestion. Tenez-le hors de portée des enfants de moins de 3 ans et des animaux, et ne le portez pas à la bouche.\"}}, {\"@type\": \"Question\", \"name\": \"Comment mettre en valeur un cristal de bismuth ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Tout est question de lumière. Un éclairage rasant, venant de côté, souligne les gradins et fait vibrer l'irisation. Sur fond sombre, bois foncé ou tissu noir, les couleurs ressortent davantage. Présentez-le dans une vitrine ou sous une cloche en verre, et tournez-le de temps en temps : chaque face révèle une palette différente.\"}}]}\u003c\/script\u003e\n","brand":"Atelier Atypique","offers":[{"title":"10 to 50 g","offer_id":54860801933635,"sku":"1005009602049209-Crystal Pyramid-10-50g","price":19.9,"currency_code":"EUR","in_stock":true},{"title":"50 to 100 g","offer_id":54860801966403,"sku":"1005009602049209-Crystal Pyramid-50-100g","price":25.9,"currency_code":"EUR","in_stock":true},{"title":"100 to 160 g","offer_id":54860801868099,"sku":"1005009602049209-Crystal Pyramid-100-160g","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0231\/3365\/0991\/files\/S5c25f181554e46928259951d13f44c2dC.webp?v=1791060650","url":"https:\/\/atelier-atypique.fr\/en\/products\/1pc-artificial-crystal-pyramid-rainbow-aura-crystal-ore-mineral-collectible-specimen-green-purple-metal-ornament-home-decor","provider":"Atelier Atypique","version":"1.0","type":"link"}