{"product_id":"uv-reactive-optical-calcite-with-rainbows-maharashtra-india-0-67-lbs","title":"UV-Reactive Optical Calcite with Rainbows – Maharashtra, India – 0.67 lbs","description":"\u003cp data-start=\"101\" data-end=\"492\" class=\"PDq2pG_selectionAnchorContainer\"\u003eAn impressive UV-Reactive Optical Calcite specimen from Maharashtra, India, featuring exceptional internal depth, broad transparent viewing areas, natural rainbow flashes, and a beautiful fluorescent response. Mounted upright on a custom display base, the specimen presents as a substantial architectural crystal with strikingly different appearances under ordinary and ultraviolet lighting.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"494\" data-end=\"899\"\u003eUnder white light, the calcite ranges from colorless and transparent to softly translucent. Large natural cleavage planes intersect throughout the interior, producing layered geometric reflections and window-like areas that allow light to travel deep into the specimen. Fine growth lines, internal veils, and smaller cleavage features add visual complexity without obscuring its overall optical character.\u003c\/p\u003e\n\u003cp data-start=\"901\" data-end=\"1206\"\u003eSeveral internal separations act as natural reflective surfaces, producing flashes of green, yellow, blue, violet, and other spectral colors as the specimen or light source is moved. These rainbows appear at different depths and angles, giving the crystal a constantly changing appearance during rotation.\u003c\/p\u003e\n\u003cp data-start=\"1208\" data-end=\"1666\"\u003eUnder ultraviolet illumination, the entire specimen develops a soft yet clearly visible pink-to-lavender fluorescent glow. The UV response reveals internal zoning and cleavage architecture that are less noticeable under ordinary lighting, while selected edges and internal features produce brighter blue-white highlights. Fluorescent color and intensity may vary according to the wavelength and strength of the UV lamp, ambient lighting, and camera settings.\u003c\/p\u003e\n\u003cp data-start=\"1668\" data-end=\"1905\"\u003eOptical calcite is also known for pronounced birefringence, or double refraction. When viewed through sufficiently clear areas, text, lines, and other objects may appear doubled because the mineral separates incoming light into two rays.\u003c\/p\u003e\n\u003cp data-start=\"1907\" data-end=\"2186\"\u003eMeasuring approximately 3 × 2 × 3.5 inches and weighing 0.67 pounds, this is a substantial mounted calcite display. Its combination of clarity, geometric structure, internal rainbows, fluorescent response, and elevated presentation gives it both collector and educational appeal.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1a3ueyz\" data-start=\"2188\" data-end=\"2205\"\u003eSpecifications\u003c\/h2\u003e\n\u003cp data-start=\"2207\" data-end=\"2223\"\u003eMineral: Calcite\u003c\/p\u003e\n\u003cp data-start=\"2225\" data-end=\"2293\"\u003eVariety\/Trade Description: UV-Reactive Optical Calcite with Rainbows\u003c\/p\u003e\n\u003cp data-start=\"2295\" data-end=\"2323\"\u003eLocality: Maharashtra, India\u003c\/p\u003e\n\u003cp data-start=\"2325\" data-end=\"2367\"\u003eWeight: 0.67 lbs (approximately 304 grams)\u003c\/p\u003e\n\u003cp data-start=\"2369\" data-end=\"2413\"\u003eDimensions: Approximately 3 × 2 × 3.5 inches\u003c\/p\u003e\n\u003cp data-start=\"2415\" data-end=\"2492\"\u003eColor Under White Light: Colorless, transparent white, and softly translucent\u003c\/p\u003e\n\u003cp data-start=\"2494\" data-end=\"2585\"\u003eFluorescence: Pink-to-lavender overall response with brighter blue-to-blue-white highlights\u003c\/p\u003e\n\u003cp data-start=\"2587\" data-end=\"2733\"\u003eUV Disclosure: Fluorescent color and intensity may vary according to UV wavelength, lamp strength, ambient lighting, exposure, and camera settings\u003c\/p\u003e\n\u003cp data-start=\"2735\" data-end=\"2813\"\u003eForm: Large natural calcite cleavage specimen with broad optical viewing faces\u003c\/p\u003e\n\u003cp data-start=\"2815\" data-end=\"2950\"\u003eInternal Features: Intersecting cleavage planes, geometric reflections, internal veils, growth lines, and rainbow-producing separations\u003c\/p\u003e\n\u003cp data-start=\"2952\" data-end=\"3076\"\u003eRainbow Effect: Multicolored spectral flashes created by light interacting with thin internal cleavage and fracture surfaces\u003c\/p\u003e\n\u003cp data-start=\"3078\" data-end=\"3169\"\u003eOptical Property: Birefringence or double refraction through sufficiently transparent areas\u003c\/p\u003e\n\u003cp data-start=\"3171\" data-end=\"3201\"\u003eLuster: Vitreous to glass-like\u003c\/p\u003e\n\u003cp data-start=\"3203\" data-end=\"3243\"\u003eTransparency: Transparent to translucent\u003c\/p\u003e\n\u003cp data-start=\"3245\" data-end=\"3269\"\u003eCrystal System: Trigonal\u003c\/p\u003e\n\u003cp data-start=\"3271\" data-end=\"3294\"\u003eChemical Formula: CaCO₃\u003c\/p\u003e\n\u003cp data-start=\"3296\" data-end=\"3326\"\u003eMohs Hardness: Approximately 3\u003c\/p\u003e\n\u003cp data-start=\"3328\" data-end=\"3387\"\u003eCleavage: Perfect rhombohedral cleavage in three directions\u003c\/p\u003e\n\u003cp data-start=\"3389\" data-end=\"3449\"\u003eMounting: Affixed to a custom display base produced in-house\u003c\/p\u003e\n\u003cp data-start=\"3451\" data-end=\"3495\"\u003eDisplay: Elevated upright collector specimen\u003c\/p\u003e\n\u003cp data-start=\"3497\" data-end=\"3637\"\u003eCondition: Natural calcite with inherent cleavage lines, internal fractures, inclusions, contacts, surface textures, and edge irregularities\u003c\/p\u003e\n\u003cp data-start=\"3639\" data-end=\"3659\"\u003eExact specimen shown\u003c\/p\u003e\n\u003ch2 data-section-id=\"g70bqp\" data-start=\"3661\" data-end=\"3685\"\u003eAbout Optical Calcite\u003c\/h2\u003e\n\u003cp data-start=\"3687\" data-end=\"3974\"\u003eCalcite is a calcium carbonate mineral known for its enormous variety of forms and its perfect rhombohedral cleavage. It separates along three consistent directions that do not meet at right angles, creating the slanted and intersecting geometric planes visible throughout this specimen.\u003c\/p\u003e\n\u003cp data-start=\"3976\" data-end=\"4282\"\u003eExceptionally transparent calcite is commonly called optical calcite because of its strong birefringence. When light enters the mineral, it separates into two rays traveling through the crystal differently. This can create two visible images when a clear section is placed over printed text or a fine line.\u003c\/p\u003e\n\u003cp data-start=\"4284\" data-end=\"4559\"\u003eThe internal rainbows are produced by a separate optical phenomenon. Thin natural cleavage separations and internal fractures interfere with and divide white light into spectral colors. Their position and intensity change with the viewing angle and direction of illumination.\u003c\/p\u003e\n\u003cp data-start=\"4561\" data-end=\"4904\"\u003eFluorescence occurs when a mineral absorbs ultraviolet energy and releases part of it as visible light. Trace elements, structural defects, inclusions, and different generations of calcite growth can influence the color and strength of the response. The specific fluorescent activator within this specimen has not been analytically determined.\u003c\/p\u003e\n\u003cp data-start=\"4906\" data-end=\"5192\"\u003eCalcite is considerably softer than quartz and possesses perfect cleavage. It should be kept away from acids, harsh chemicals, prolonged soaking, and sudden temperature changes. Handle the specimen by its display base and clean it only with a soft, dry brush or gentle microfiber cloth.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1punl39\" data-start=\"5194\" data-end=\"5212\"\u003eCollector Notes\u003c\/h2\u003e\n\u003cp data-start=\"5214\" data-end=\"5237\"\u003eThis specimen features:\u003c\/p\u003e\n\u003cul data-start=\"5239\" data-end=\"6064\"\u003e\n\u003cli data-section-id=\"vpzkv\" data-start=\"5239\" data-end=\"5279\"\u003eSubstantial 0.67-pound optical calcite\u003c\/li\u003e\n\u003cli data-section-id=\"19jwa7d\" data-start=\"5280\" data-end=\"5322\"\u003eNatural material from Maharashtra, India\u003c\/li\u003e\n\u003cli data-section-id=\"1uyfzcf\" data-start=\"5323\" data-end=\"5371\"\u003eBroad transparent-to-translucent viewing faces\u003c\/li\u003e\n\u003cli data-section-id=\"u8dhs6\" data-start=\"5372\" data-end=\"5416\"\u003ePronounced internal geometric architecture\u003c\/li\u003e\n\u003cli data-section-id=\"1fmptaf\" data-start=\"5417\" data-end=\"5455\"\u003eIntersecting natural cleavage planes\u003c\/li\u003e\n\u003cli data-section-id=\"1y3ydev\" data-start=\"5456\" data-end=\"5491\"\u003eWindow-like optical viewing areas\u003c\/li\u003e\n\u003cli data-section-id=\"oqco3w\" data-start=\"5492\" data-end=\"5539\"\u003eStrong internal depth and layered reflections\u003c\/li\u003e\n\u003cli data-section-id=\"11sovoo\" data-start=\"5540\" data-end=\"5579\"\u003eMultiple concentrated rainbow flashes\u003c\/li\u003e\n\u003cli data-section-id=\"1nlk2dc\" data-start=\"5580\" data-end=\"5648\"\u003eGreen, yellow, blue, violet, and multicolored spectral reflections\u003c\/li\u003e\n\u003cli data-section-id=\"12nrial\" data-start=\"5649\" data-end=\"5687\"\u003eNatural double-refraction properties\u003c\/li\u003e\n\u003cli data-section-id=\"11tgnjp\" data-start=\"5688\" data-end=\"5722\"\u003ePink-to-lavender UV fluorescence\u003c\/li\u003e\n\u003cli data-section-id=\"p9hco2\" data-start=\"5723\" data-end=\"5767\"\u003eBrighter blue-white fluorescent highlights\u003c\/li\u003e\n\u003cli data-section-id=\"10m3an3\" data-start=\"5768\" data-end=\"5817\"\u003eVisible internal zoning under ultraviolet light\u003c\/li\u003e\n\u003cli data-section-id=\"10ojem9\" data-start=\"5818\" data-end=\"5873\"\u003eDramatically different white-light and UV appearances\u003c\/li\u003e\n\u003cli data-section-id=\"1obdbtw\" data-start=\"5874\" data-end=\"5913\"\u003eCustom display base produced in-house\u003c\/li\u003e\n\u003cli data-section-id=\"1h0plg5\" data-start=\"5914\" data-end=\"5945\"\u003eElevated upright presentation\u003c\/li\u003e\n\u003cli data-section-id=\"1xkzmle\" data-start=\"5946\" data-end=\"5997\"\u003eDecorative, mineralogical, and educational appeal\u003c\/li\u003e\n\u003cli data-section-id=\"xjwr3e\" data-start=\"5998\" data-end=\"6038\"\u003eOne-of-a-kind natural mineral specimen\u003c\/li\u003e\n\u003cli data-section-id=\"1bmwm75\" data-start=\"6039\" data-end=\"6064\"\u003eExact specimen pictured\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"6066\" data-end=\"6285\"\u003ePerfect for collectors of optical calcite, fluorescent calcite, rainbow minerals, transparent minerals, birefringent crystals, UV-reactive minerals, Indian minerals, Maharashtra specimens, and natural optical phenomena.\u003c\/p\u003e\n\u003cp data-start=\"6287\" data-end=\"6337\"\u003eProfessionally packaged and shipped from Colorado.\u003c\/p\u003e\n\u003cp data-start=\"6339\" data-end=\"6381\"\u003eYou will receive the exact specimen shown.\u003c\/p\u003e\n\u003cp data-start=\"6383\" data-end=\"6518\"\u003eEvery order is backed by our commitment to quality and customer satisfaction. Thank you for supporting our family-owned small business.\u003c\/p\u003e","brand":"Serenity Soul Stones","offers":[{"title":"Default Title","offer_id":49749759820026,"sku":null,"price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/2328\/8826\/files\/UV-ReactiveOpticalCalcitewithRainbows_Maharashtra_India_0.67lbs_4.jpg?v=1784920489","url":"https:\/\/serenitysoulstones.com\/products\/uv-reactive-optical-calcite-with-rainbows-maharashtra-india-0-67-lbs","provider":"Serenity Soul Stones","version":"1.0","type":"link"}