{"product_id":"500g-natural-american-yooperlites-flame-stones-fluorescent-stone-energy-reiki-specimens-aquarium-home-room-decor-gems-crystal","title":"Raw fluorescent Yooperlite, stone that glows under UV light - FIREFLY","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 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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\n\u003cp\u003e\u003cspan class=\"aa-badge aa-badge-noir\"\u003eUV Fluorescence\u003c\/span\u003e \u003cspan class=\"aa-badge aa-badge-orange\"\u003eRaw stone\u003c\/span\u003e In daylight, it's a gray, almost unremarkable pebble. Turn off the light, turn on an \u003cstrong\u003eultraviolet lamp\u003c\/strong\u003e, and the stone is suddenly covered in \u003cstrong\u003eglowing orange dots and veins\u003c\/strong\u003e, like embers. LUCIOLE offers you \u003cstrong\u003eraw yooperlite\u003c\/strong\u003e, a \u003cstrong\u003esyenite rich in fluorescent sodalite\u003c\/strong\u003e that has become one of the most astonishing mineralogical curiosities of recent years. Each stone is \u003cstrong\u003enatural and unpolished\u003c\/strong\u003e, unique in its shape and the luminous pattern it reveals under UV light. Four formats are available: \u003cstrong\u003eone piece\u003c\/strong\u003e measuring about 3 to 4 cm to discover the phenomenon, or a \u003cstrong\u003e200g, 400g, or 500g pack\u003c\/strong\u003e to fill a display case, a bowl, a decorative aquarium, or to use in a science workshop. An object that fascinates both children and adults, and offers a very concrete way to discover a very real physical phenomenon: \u003cstrong\u003efluorescence\u003c\/strong\u003e.\u003c\/p\u003e\n\n\n\u003ch3 class=\"aa-title\"\u003eAvailable formats\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:linear-gradient(135deg,#3A3A3A 0%,#6E6E6E 70%,#D89020 100%)\"\u003e1 PIECE\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e1 piece\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eA raw stone of about 3 to 4 cm, to discover the phenomenon\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:linear-gradient(135deg,#3A3A3A 0%,#6E6E6E 60%,#D89020 100%)\"\u003e200G PACK\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e200g pack\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eSeveral stones of various sizes, for a bowl or a workshop\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:linear-gradient(135deg,#3A3A3A 0%,#6E6E6E 50%,#C84B31 100%)\"\u003e400G PACK\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e400g pack\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eA generous assortment for a display case or a luminous decoration\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:linear-gradient(135deg,#1A1A1A 0%,#3A3A3A 40%,#C84B31 100%)\"\u003e500G PACK\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e500g pack\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eThe largest format, for a decorative aquarium or a whole class\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-mat\"\u003e\n\n\u003ch3\u003eWhy does yooperlite light up?\u003c\/h3\u003e\n\n\u003cp\u003eYooperlite is a \u003cstrong\u003esyenite\u003c\/strong\u003e, an igneous rock composed mainly of feldspar, which contains grains of \u003cstrong\u003esodalite\u003c\/strong\u003e, a sodium and aluminum silicate containing chlorine. Some sodalites are \u003cstrong\u003efluorescent\u003c\/strong\u003e: when they receive ultraviolet radiation, invisible to the human eye, they absorb this light and re-emit it almost instantly in the visible spectrum, here in shades of \u003cstrong\u003eorange to yellow\u003c\/strong\u003e. As soon as the lamp is turned off, the emission ceases: that is the difference between fluorescence and phosphorescence.\u003c\/p\u003e\n\n\u003cp\u003eThese stones were discovered on the beaches of \u003cstrong\u003eLake Superior\u003c\/strong\u003e, on Michigan's Upper Peninsula, where the locals call themselves \"Yoopers\": hence their name. Sodalite fluorescence is most pronounced under a \u003cstrong\u003elong-wave\u003c\/strong\u003e UV lamp, around 365 nm. Each stone reveals a different pattern, depending on the distribution of fluorescent grains within the rock.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003ch3 class=\"aa-title\"\u003eWhy you will 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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA striking effect\u003c\/span\u003e\u003cspan class=\"ds\"\u003eA gray stone that becomes speckled with glowing orange dots under UV light: guaranteed to impress your guests.\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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA real scientific phenomenon\u003c\/span\u003e\u003cspan class=\"ds\"\u003eSodalite fluorescence can be observed with the naked eye: a physics lesson on light you can hold in your hand.\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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eEvery stone is unique\u003c\/span\u003e\u003cspan class=\"ds\"\u003eThe glowing pattern depends on the distribution of the sodalite grains: no two stones are alike.\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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eFour formats\u003c\/span\u003e\u003cspan class=\"ds\"\u003eThe single unit for discovery, the 200, 400, or 500g packs for a display case, aquarium, or workshop.\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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eRaw and natural\u003c\/span\u003e\u003cspan class=\"ds\"\u003eNo dyes, no polishing: the stone is presented exactly as it was collected and sorted.\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\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eAn original nighttime decoration\u003c\/span\u003e\u003cspan class=\"ds\"\u003eCombined with a UV lamp, it becomes a mineral nightlight with a strange and poetic charm.\u003c\/span\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-des\"\u003e\n\n\u003cp class=\"t\"\u003eEmbers on the shore of a lake\u003c\/p\u003e\n\n\u003cdiv class=\"x\"\u003e\n\n\u003cp\u003eFor a long time, these gray pebbles were walked over without a second glance. All it took was a walker strolling along a beach of Lake Superior at night, an \u003cstrong\u003eultraviolet lamp\u003c\/strong\u003e in hand, to reveal what no one had seen: stones speckled with \u003cstrong\u003eorange glows\u003c\/strong\u003e, like embers fallen onto the sand. The phenomenon made headlines worldwide, and within a few years, yooperlite became a must-have for collectors.\u003c\/p\u003e\n\n\u003cp\u003eLUCIOLE pays tribute to this moment of discovery. By day, the stone is discreet and blends into a bowl of pebbles. By night, under the beam of a UV lamp, it transforms into a \u003cstrong\u003eminiature starry sky\u003c\/strong\u003e, where every grain of sodalite becomes a spark.\u003c\/p\u003e\n\n\u003cp\u003eIt naturally finds its place in mineral displays, on the desks of curious minds, and in the rooms of science-loving children, as well as in \u003cstrong\u003edecorative aquariums\u003c\/strong\u003e and UV-lit terrariums, where its orange glows create a striking setting.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-steps\"\u003e\n\n\u003ch4\u003eReveal fluorescence in 4 steps\u003c\/h4\u003e\n\n  \u003cdiv class=\"aa-step\"\u003e\n\n\u003cspan class=\"aa-step-n\"\u003e1\u003c\/span\u003e\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eGet a UV lamp.\u003c\/strong\u003e Choose a long-wave ultraviolet flashlight, ideally \u003cstrong\u003e365 nm\u003c\/strong\u003e (not included). 395 nm lamps sometimes work, but with a less distinct effect.\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\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eCreate darkness.\u003c\/strong\u003e Turn off the lights and close the curtains: the darker the room, the more intensely the fluorescent dots stand out.\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\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eScan the stone.\u003c\/strong\u003e Direct the beam toward the stone from a few centimeters away and rotate it: the areas rich in sodalite will glow orange-yellow.\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\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eDisplay and compare.\u003c\/strong\u003e Arrange the stones in a bowl, display case, or aquarium and compare their luminous patterns. Turn the lights back on: they instantly return to gray.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003ch3 class=\"aa-title\"\u003eFormat comparison\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-cmp\"\u003e\u003ctable\u003e\n\n\u003cthead\u003e\u003ctr\u003e\n\n\u003cth\u003eCriteria\u003c\/th\u003e\n\n\u003cth\u003e1 piece\u003c\/th\u003e\n\n\u003cth\u003e200g pack\u003c\/th\u003e\n\n\u003cth\u003e400g pack\u003c\/th\u003e\n\n\u003cth\u003e500g pack\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eContent\u003c\/td\u003e\n\n\u003ctd\u003eOne stone approx. 3-4 cm\u003c\/td\u003e\n\n\u003ctd\u003eSeveral stones\u003c\/td\u003e\n\n\u003ctd\u003eSeveral stones\u003c\/td\u003e\n\n\u003ctd\u003eSeveral stones\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eSizes\u003c\/td\u003e\n\n\u003ctd\u003eApprox. 3-4 cm\u003c\/td\u003e\n\n\u003ctd\u003eVaried\u003c\/td\u003e\n\n\u003ctd\u003eVaried\u003c\/td\u003e\n\n\u003ctd\u003eVaried\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eIdeal for\u003c\/td\u003e\n\n\u003ctd\u003eDiscovery, small gift\u003c\/td\u003e\n\n\u003ctd\u003eBowl, children's workshop\u003c\/td\u003e\n\n\u003ctd\u003eDisplay case, decor\u003c\/td\u003e\n\n\u003ctd\u003eAquarium, group, class\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"hl\"\u003e\n\n\u003ctd\u003eUV lamp\u003c\/td\u003e\n\n\u003ctd\u003eNot included\u003c\/td\u003e\n\n\u003ctd\u003eNot included\u003c\/td\u003e\n\n\u003ctd\u003eNot included\u003c\/td\u003e\n\n\u003ctd\u003eNot included\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eFinish\u003c\/td\u003e\n\n\u003ctd\u003eRaw\u003c\/td\u003e\n\n\u003ctd\u003eRaw\u003c\/td\u003e\n\n\u003ctd\u003eRaw\u003c\/td\u003e\n\n\u003ctd\u003eRaw\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-info\"\u003e\u003cp\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e the \u003cstrong\u003eUV lamp visible in the photos is not provided\u003c\/strong\u003e. Without ultraviolet light, yooperlite appears as a gray to gray-beige stone, sometimes speckled: this is perfectly normal. This is a \u003cstrong\u003enatural raw stone\u003c\/strong\u003e: the intensity and distribution of the fluorescence vary from one stone to another, and the number of stones in a pack depends on their size. We present these stones as yooperlite, without being able to guarantee their exact collection site. A small amount of yooperlite is also available in our assortment of raw collectible minerals.\u003c\/p\u003e\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-tip\"\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e to photograph the fluorescence, place the stone in total darkness, illuminate it at an angle with the \u003cstrong\u003e365 nm\u003c\/strong\u003e lamp, and use the night mode or a slightly longer exposure on your phone, placed on a stable surface. For an even more beautiful effect, \u003cstrong\u003elightly dampen\u003c\/strong\u003e the stone: the wet surface accentuates the contrasts, just like on a beach.\u003c\/p\u003e\u003c\/div\u003e\n\n\n\u003ch3 class=\"aa-title\"\u003eTechnical specifications\u003c\/h3\u003e\n\n\u003cdiv class=\"aa-sp\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\n\u003ctd\u003eFluorescent raw stone\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eModel name\u003c\/td\u003e\n\n\u003ctd\u003eLUCIOLE\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eNature\u003c\/td\u003e\n\n\u003ctd\u003eSyenite rich in fluorescent sodalite (yooperlite)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eFormats\u003c\/td\u003e\n\n\u003ctd\u003e1 piece · 200g pack · 400g pack · 500g pack\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eSize (1 piece)\u003c\/td\u003e\n\n\u003ctd\u003eApprox. 3 to 4 cm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eSize (packs)\u003c\/td\u003e\n\n\u003ctd\u003eStones of various sizes\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eColor in daylight\u003c\/td\u003e\n\n\u003ctd\u003eGray, gray-beige\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eColor under UV\u003c\/td\u003e\n\n\u003ctd\u003eOrange to yellow dots and veins\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRecommended UV source\u003c\/td\u003e\n\n\u003ctd\u003eLong-wave UV lamp, 365 nm (not included)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eFinish\u003c\/td\u003e\n\n\u003ctd\u003eRaw, unpolished\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\n\u003ctd\u003eNot guaranteed\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eUse\u003c\/td\u003e\n\n\u003ctd\u003eCollection, decoration, decorative aquarium, education\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-warn\"\u003e\u003cp\u003e\u003cstrong\u003ePrecautions:\u003c\/strong\u003e when using a UV lamp, \u003cstrong\u003enever look directly at the source\u003c\/strong\u003e and do not direct the beam toward your own eyes, those of a child, or an animal; prolonged exposure can be harmful to the eyes and skin. Children should use the lamp under \u003cstrong\u003eadult supervision\u003c\/strong\u003e. The stones are small objects: keep them \u003cstrong\u003eout of reach of young children\u003c\/strong\u003e (risk of ingestion) and do not put them in your mouth. Some edges may be irregular.\u003c\/p\u003e\u003c\/div\u003e\n\n\n\u003cdiv class=\"aa-gift\"\u003e\n\n\u003ch3\u003eA gift that makes eyes sparkle\u003c\/h3\u003e\n\n\u003cp\u003eFor a science-loving child, a mystery-loving teen, a mineral collector, or an aquarist in search of original decor, LUCIOLE is a gift that is as surprising as it is educational. Give one stone for the pleasure of discovery, or a full pack for a family or classroom workshop. Consider adding a small 365 nm UV lamp so the effect is immediate upon opening.\u003c\/p\u003e\n\n\u003cp\u003eContinue your exploration with our \u003ca href=\"\/collections\/mineraux-et-chimie\"\u003eminerals and chemistry\u003c\/a\u003e selection, discover our entire range of \u003ca href=\"\/collections\/objets-scientifiques\"\u003eLab scientific objects\u003c\/a\u003e, or combine the stone with our \u003ca href=\"\/collections\/decoration\"\u003edecorative items\u003c\/a\u003e for a shelf full of curiosities.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\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\u003csummary\u003eWhat is yooperlite?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003e\u003cstrong\u003eYooperlite\u003c\/strong\u003e is the name given to a \u003cstrong\u003esyenite\u003c\/strong\u003e, an igneous rock rich in feldspar, which contains grains of \u003cstrong\u003efluorescent sodalite\u003c\/strong\u003e. It was noticed on the shores of \u003cstrong\u003eLake Superior\u003c\/strong\u003e, on the Upper Peninsula of Michigan, USA, whose inhabitants are nicknamed \"Yoopers.\" In daylight, it looks like a simple gray pebble; under an ultraviolet lamp, the sodalite lights up in \u003cstrong\u003eorange-yellow\u003c\/strong\u003e. Therefore, it is not a mineral species in its own right, but a rock whose interest lies in its fluorescence. We do not guarantee the exact collection site of the stones offered here.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eIs the UV lamp included?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eNo, \u003cstrong\u003ethe UV lamp is not included\u003c\/strong\u003e: the one that appears in some photos is only used to demonstrate the effect. To observe fluorescence, you need a \u003cstrong\u003elong-wave ultraviolet lamp\u003c\/strong\u003e, ideally \u003cstrong\u003e365 nm\u003c\/strong\u003e. These small flashlights are easily found. The 395 nm models, which are more common, emit more visible violet light and often give a less distinct effect. The ideal way to use them is in a dark room. If you are giving the stone as a gift, consider providing a lamp at the same time: the discovery will be immediate and much more spectacular.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eWhat is the difference between fluorescence and phosphorescence?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eA \u003cstrong\u003efluorescent\u003c\/strong\u003e stone absorbs ultraviolet radiation and re-emits visible light \u003cstrong\u003eonly while it is being illuminated\u003c\/strong\u003e: as soon as you turn off the lamp, it returns to gray. A \u003cstrong\u003ephosphorescent\u003c\/strong\u003e material, like some paints or self-adhesive stars, conversely continues to glow for a few seconds or minutes after the source is turned off. Yooperlite is \u003cstrong\u003efluorescent\u003c\/strong\u003e: it does not \"charge\" and does not glow on its own in the dark. This is what makes the experience so interesting, because one can clearly see that the emitted light depends directly on the UV illumination received.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eHow many stones are in a pack?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eThe packs are sold \u003cstrong\u003eby weight\u003c\/strong\u003e: 200g, 400g, or 500g. The number of stones is therefore not fixed and depends on the size of the stones in the pack, which varies from one harvest to another. A pack may thus contain a few large stones and several smaller ones. The \u003cstrong\u003e1-piece\u003c\/strong\u003e format corresponds to a stone of approximately \u003cstrong\u003e3 to 4 cm\u003c\/strong\u003e. Since each stone is \u003cstrong\u003enatural and raw\u003c\/strong\u003e, its appearance, shape, and fluorescence intensity differ: this is precisely what makes it interesting to compare several specimens under the lamp.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eCan these stones be put in an aquarium?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eThe photos show yooperlite in \u003cstrong\u003eaquarium decor\u003c\/strong\u003e, where its orange sparkles stand out beautifully under UV lighting. Before any immersion, we advise you to \u003cstrong\u003ecarefully rinse\u003c\/strong\u003e the stones in clean water, without soap or chemicals, to remove dust and residue. We do not have supplier information regarding the potential effect of these stones on water chemistry: for a populated aquarium, especially with sensitive species, monitor water parameters after adding them and seek advice from your usual specialist. In an empty aquarium or decorative terrarium, there is no particular issue with its use.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eIs UV light dangerous?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eSmall hobby UV lamps can be used without difficulty by following a few simple rules: \u003cstrong\u003enever look directly at the source\u003c\/strong\u003e, do not direct the beam toward anyone's eyes or an animal, and avoid prolonged skin exposure. Ultraviolet light is invisible, so the eye does not reflexively protect itself as it would against a bright light. Children must use the lamp \u003cstrong\u003eunder adult supervision\u003c\/strong\u003e. UV-filtering glasses can be useful for prolonged observations. The stone itself emits no radiation: it simply converts the received UV light into visible light.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n  \u003cdetails class=\"aa-q\"\u003e\u003csummary\u003eHow to maintain yooperlite?\u003c\/summary\u003e\u003cdiv class=\"aa-a\"\u003e\u003cp\u003eYooperlite is a robust rock for daily use. A \u003cstrong\u003erinse with clean water\u003c\/strong\u003e and air drying are enough to clean it; a soft brush can be used to remove dust lodged in the crevices. Avoid household products, acids, and detergents. Store the stones in a bowl, box, or display case, away from impacts, to prevent them from chipping. Fluorescence does not wear out over time: you can repeat the experience as many times as you like, the effect remains identical.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\n\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Qu'est-ce que la yooperlite ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"La yooperlite est une syénite, roche magmatique riche en feldspaths, contenant des grains de sodalite fluorescente. Remarquée sur les rives du lac Supérieur, au Michigan, elle ressemble à un galet gris à la lumière du jour et s'illumine en orange-jaune sous UV. Le lieu de récolte exact des pierres proposées n'est pas garanti.\"}}, {\"@type\": \"Question\", \"name\": \"La lampe UV est-elle incluse ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Non, la lampe UV n'est pas incluse : celle des photos sert à montrer l'effet. Il faut une lampe ultraviolette à ondes longues, idéalement de 365 nm, utilisée dans une pièce sombre. Les lampes à 395 nm donnent souvent un effet moins net. Pour un cadeau, prévoyez une lampe en même temps.\"}}, {\"@type\": \"Question\", \"name\": \"Quelle différence entre fluorescence et phosphorescence ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Une pierre fluorescente réémet de la lumière visible seulement pendant qu'elle reçoit des ultraviolets : elle redevient grise dès qu'on éteint la lampe. Une matière phosphorescente continue de briller après l'arrêt de la source. La yooperlite est fluorescente : elle ne se charge pas et ne brille pas seule dans le noir.\"}}, {\"@type\": \"Question\", \"name\": \"Combien de pierres contient un lot ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Les lots sont vendus au poids : 200 g, 400 g ou 500 g. Le nombre de pierres n'est pas fixe et dépend de leur taille, qui varie d'une récolte à l'autre. Le format 1 pièce correspond à une pierre d'environ 3 à 4 cm. Chaque pierre naturelle a un aspect et une fluorescence propres.\"}}, {\"@type\": \"Question\", \"name\": \"Peut-on mettre ces pierres dans un aquarium ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Les photos montrent la yooperlite en décor d'aquarium. Rincez soigneusement les pierres à l'eau claire, sans savon, avant toute immersion. Aucune donnée fournisseur n'existe sur leur effet sur la chimie de l'eau : pour un aquarium habité, surveillez les paramètres de l'eau et demandez conseil à votre spécialiste habituel en aquariophilie.\"}}, {\"@type\": \"Question\", \"name\": \"La lumière UV est-elle dangereuse ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Les lampes UV de loisir s'utilisent sans difficulté avec quelques règles : ne regardez jamais directement la source, ne visez ni les yeux ni un animal et évitez d'exposer longuement la peau. Les enfants doivent être surveillés par un adulte. La pierre n'émet aucun rayonnement : elle convertit l'UV reçu en lumière visible.\"}}, {\"@type\": \"Question\", \"name\": \"Comment entretenir la yooperlite ?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Rincez la pierre à l'eau claire et laissez-la sécher à l'air ; un pinceau doux retire la poussière des creux. Évitez produits ménagers, acides et détergents, et rangez les pierres à l'abri des chocs. La fluorescence ne s'épuise pas au fil des observations : l'expérience se répète à volonté, aussi souvent que souhaité.\"}}]}\u003c\/script\u003e\n","brand":"Atelier Atypique","offers":[{"title":"1 piece","offer_id":54861645775171,"sku":"1005005909809682-Color-3-4cm 1pc","price":9.9,"currency_code":"GBP","in_stock":true},{"title":"200 g pack","offer_id":54861645807939,"sku":"1005005909809682-Color-200g  (pack)","price":29.9,"currency_code":"GBP","in_stock":true},{"title":"400 g pack","offer_id":54861645906243,"sku":"1005005909809682-Color-400g (pack)","price":54.9,"currency_code":"GBP","in_stock":true},{"title":"500 g pack","offer_id":54861645873475,"sku":"1005005909809682-Color-500g (pack)","price":64.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0231\/3365\/0991\/files\/S8d6460fcd3804a41a313cbf1610a3469X.webp?v=1791230550","url":"https:\/\/atelier-atypique.co.uk\/products\/500g-natural-american-yooperlites-flame-stones-fluorescent-stone-energy-reiki-specimens-aquarium-home-room-decor-gems-crystal","provider":"Atelier Atypique","version":"1.0","type":"link"}