{"product_id":"yooperlite-brute-fluorescente-pierre-qui-s-illumine-sous-uv-luciole","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 .aa-badge-noir{background:#1A1A1A;color:#FAC775}\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\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 is a grey, almost unremarkable pebble. Turn off the light, switch on a \u003cstrong\u003eUV flashlight\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 glowing pattern it reveals under UV light. Four formats are available: \u003cstrong\u003ea single piece\u003c\/strong\u003e of about 3 to 4 cm to discover the phenomenon, or a \u003cstrong\u003e200g\u003c\/strong\u003e, \u003cstrong\u003e400g\u003c\/strong\u003e, or \u003cstrong\u003e500g batch\u003c\/strong\u003e to fill a display case, a bowl, a decorative aquarium, or to liven up a science workshop. An object that fascinates children and adults alike, providing a very concrete way to discover a very real physical phenomenon: \u003cstrong\u003efluorescence\u003c\/strong\u003e.\u003c\/p\u003e\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%);\"\u003e200 G BATCH\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e200g batch\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%);\"\u003e400 G BATCH\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e400g batch\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%);\"\u003e500 G BATCH\u003c\/div\u003e\n\n\u003cdiv class=\"aa-var-i\"\u003e\n\n\u003cspan class=\"aa-var-n\"\u003e500g batch\u003c\/span\u003e\u003cspan class=\"aa-var-d\"\u003eThe largest format, for a decorative aquarium or an entire classroom\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\u003eWhy does yooperlite glow?\u003c\/h3\u003e\n\n\u003cp\u003eYooperlite is a \u003cstrong\u003esyenite\u003c\/strong\u003e, an igneous rock composed primarily of feldspars, which contains grains of \u003cstrong\u003esodalite\u003c\/strong\u003e, a sodium-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 \u003cstrong\u003eorange to yellow\u003c\/strong\u003e tones. As soon as the lamp is turned off, the emission stops: that is the difference between fluorescence and phosphorescence.\u003c\/p\u003e\n\n\u003cp\u003eThese stones were noticed on the shores of \u003cstrong\u003eLake Superior\u003c\/strong\u003e, in the Upper Peninsula of Michigan, where the inhabitants are nicknamed \"Yoopers,\" hence the name. Sodalite fluorescence is most prominent under a \u003cstrong\u003elong-wave\u003c\/strong\u003e UV lamp, around 365 nm. Each stone thus reveals a different pattern, depending on the distribution of fluorescent grains in the rock.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\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\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eA striking effect\u003c\/span\u003e\u003cspan class=\"ds\"\u003eA grey stone that becomes studded with luminous orange dots under UV light: your guests are guaranteed to react.\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 real scientific phenomenon\u003c\/span\u003e\u003cspan class=\"ds\"\u003eSodalite fluorescence can be observed with the naked eye: a physics lesson on light that fits 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\n\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 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\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eFour formats\u003c\/span\u003e\u003cspan class=\"ds\"\u003eSingle piece for discovery, 200g, 400g, or 500g batches 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\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eRaw and natural\u003c\/span\u003e\u003cspan class=\"ds\"\u003eNo dyes, no polishing: the stone is presented just 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\n\u003cdiv\u003e\n\n\u003cspan class=\"tt\"\u003eAn original nightlight\u003c\/span\u003e\u003cspan class=\"ds\"\u003ePaired 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\u003cdiv class=\"aa-des\"\u003e\n\n\u003cp class=\"t\"\u003eEmbers by a lake\u003c\/p\u003e\n\n\u003cdiv class=\"x\"\u003e\n\n\u003cp\u003eFor a long time, these grey pebbles were walked over without a second glance. All it took was a walker strolling along a Lake Superior beach at night with a \u003cstrong\u003eUV flashlight\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 turns into a \u003cstrong\u003etiny starry sky\u003c\/strong\u003e, where every grain of sodalite becomes a spark.\u003c\/p\u003e\n\n\u003cp\u003eIt naturally belongs in mineral display cases, 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 sparks create a striking setting.\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\u003eRevealing the 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\n\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\n\u003cdiv class=\"aa-step-c\"\u003e\n\n\u003cstrong\u003eMake it dark.\u003c\/strong\u003e Turn off the lights and close the curtains: the darker the room, the more intensely the fluorescent points will 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\n\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 turn it: the areas rich in sodalite will illuminate in 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\n\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 grey.\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eFormat 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\u003eCriterion\u003c\/th\u003e\n\n\u003cth\u003e1 piece\u003c\/th\u003e\n\n\u003cth\u003e200g batch\u003c\/th\u003e\n\n\u003cth\u003e400g batch\u003c\/th\u003e\n\n\u003cth\u003e500g batch\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\u003eContents\u003c\/td\u003e\n\n\u003ctd\u003eOne stone approx. 3-4 cm\u003c\/td\u003e\n\n\u003ctd\u003eMultiple stones\u003c\/td\u003e\n\n\u003ctd\u003eMultiple stones\u003c\/td\u003e\n\n\u003ctd\u003eMultiple 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, decoration\u003c\/td\u003e\n\n\u003ctd\u003eAquarium, group, classroom\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\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-info\"\u003e\n\n\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, yooperlite appears as a grey to grey-beige stone, sometimes speckled: this is completely normal. This is a \u003cstrong\u003enatural raw stone\u003c\/strong\u003e: the intensity and distribution of fluorescence vary from one stone to another, and the number of stones in a batch depends on their size. We offer these stones as yooperlite without being able to guarantee their exact location of collection. A small amount of yooperlite is also offered in our collection of raw collectible minerals.\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 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 long exposure on your phone, placed on a stable support. For an even more beautiful effect, \u003cstrong\u003elightly moisten\u003c\/strong\u003e the stone: the wet surface accentuates the contrast, just like on a beach.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003ch3 class=\"aa-title\"\u003eTechnical specifications\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\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 batch · 400g batch · 500g batch\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 (batches)\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\u003eDaylight color\u003c\/td\u003e\n\n\u003ctd\u003eGrey, grey-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\u003eProvenance\u003c\/td\u003e\n\n\u003ctd\u003eNot guaranteed\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eUsage\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\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 when using a UV lamp, \u003cstrong\u003enever look directly at the source\u003c\/strong\u003e and do not point the beam at the eyes of a child or an animal; prolonged exposure can be harmful to the eyes and skin. Children must 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 the mouth. Some edges may be irregular.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"aa-gift\"\u003e\n\n\u003ch3\u003eA gift that makes eyes shine\u003c\/h3\u003e\n\n\u003cp\u003eFor a science-loving child, a mystery-loving teenager, a mineral collector, or an aquarist in search of an original decoration, LUCIOLE is a gift as surprising as it is educational. Give a stone for the pleasure of discovery, or a full batch for a workshop with family or in the classroom. Remember to add a small 365 nm UV lamp so the effect is immediate upon opening.\u003c\/p\u003e\n\n\u003cp\u003eExtend the exploration with our \u003ca href=\"\/en\/collections\/mineraux-et-chimie\"\u003eminerals and chemistry\u003c\/a\u003e selection, discover all of our \u003ca href=\"\/en\/collections\/objets-scientifiques\"\u003escientific objects from the Lab\u003c\/a\u003e, or pair the stone with our \u003ca href=\"\/en\/collections\/decoration\"\u003edecoration items\u003c\/a\u003e for a shelf full of curiosities.\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\u003eWhat is yooperlite?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eYooperlite\u003c\/strong\u003e is the name given to a \u003cstrong\u003esyenite\u003c\/strong\u003e, an igneous rock rich in feldspars, which contains grains of \u003cstrong\u003efluorescent sodalite\u003c\/strong\u003e. It was noticed on the shores of \u003cstrong\u003eLake Superior\u003c\/strong\u003e, in Michigan's Upper Peninsula, USA, where the inhabitants are nicknamed \"Yoopers.\" In daylight, it looks like a simple grey pebble; under an ultraviolet lamp, the sodalite glows in \u003cstrong\u003eorange-yellow\u003c\/strong\u003e. It is therefore not a mineral species in its own right, but a rock whose interest lies in its fluorescence. We do not guarantee the exact collection location of the stones offered here.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eIs the UV lamp included?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eNo, \u003cstrong\u003ethe UV lamp is not included\u003c\/strong\u003e: the one that appears in some photos is only used to show 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 easy to find. The more common 395 nm models emit more visible violet light and often give a less distinct effect. It is best to use them 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\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eWhat is the difference between fluorescence and phosphorescence?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\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 grey. 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, as you can see very clearly that the emitted light depends directly on the UV illumination received.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eHow many stones does a batch contain?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eBatches 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 batch, which varies from one harvest to another. A batch may thus contain a few large stones and several smaller ones. The \u003cstrong\u003e1-piece\u003c\/strong\u003e format corresponds to one stone of about \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\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eCan these stones be put in an aquarium?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eThe photos show yooperlite as \u003cstrong\u003eaquarium decoration\u003c\/strong\u003e, where its orange sparks stand out beautifully under UV lighting. Before any immersion, we advise you to \u003cstrong\u003erinse the stones thoroughly\u003c\/strong\u003e with clean water, without soap or chemicals, to remove dust and residue. We do not have supplier information on the possible effect of these stones on water chemistry: for a populated aquarium, especially with sensitive species, monitor water parameters after adding them and consult your usual specialist. In an empty aquarium or a decorative terrarium, their use is fine.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eIs UV light dangerous?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\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 point the beam at anyone's eyes or at an animal, and avoid prolonged skin exposure. Ultraviolet light is invisible, so the eye does not reflexively protect itself as it would against 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 does not emit any radiation: it simply converts the UV it receives into visible light.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c\/details\u003e\n\u003cdetails class=\"aa-q\"\u003e\n\u003csummary\u003eHow do you care for yooperlite?\u003c\/summary\u003e\n\u003cdiv class=\"aa-a\"\u003e\n\n\u003cp\u003eYooperlite is a robust rock for daily use. A \u003cstrong\u003erinse with clear 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 cleaning 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 fade over time: you can repeat the experiment as many times as you like, the effect remains the same.\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","brand":"Atelier Atypique","offers":[{"title":"1 piece","offer_id":54861645775171,"sku":"1005005909809682-Color-3-4cm 1pc","price":9.9,"currency_code":"EUR","in_stock":true},{"title":"200 g pack","offer_id":54861645807939,"sku":"1005005909809682-Color-200g  (pack)","price":29.9,"currency_code":"EUR","in_stock":true},{"title":"400 g pack","offer_id":54861645906243,"sku":"1005005909809682-Color-400g (pack)","price":54.9,"currency_code":"EUR","in_stock":true},{"title":"500 g pack","offer_id":54861645873475,"sku":"1005005909809682-Color-500g (pack)","price":64.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0231\/3365\/0991\/files\/S8d6460fcd3804a41a313cbf1610a3469X.webp?v=1791230550","url":"https:\/\/atelierproatypique.com\/en\/products\/yooperlite-brute-fluorescente-pierre-qui-s-illumine-sous-uv-luciole","provider":"Atelier Atypique","version":"1.0","type":"link"}