{"product_id":"rare-tenebrescent-color-changing-cubic-fluorite-hidden-forest-pocket-diana-maria-mine-frosterley-weardale-county-durham-england","title":"Rare Tenebrescent Color-Changing Cubic Fluorite | Hidden Forest Pocket — Diana Maria Mine, Frosterley, Weardale, County Durham, England","description":"\u003cp\u003e\u003cspan\u003eThis exceptional tenebrescent cubic fluorite specimen comes from the famous Hidden Forest Pocket of the Diana Maria Mine in Weardale, England. The sharply formed cubes display a remarkable color-changing effect—shifting from vivid forest green to deep blue depending on lighting conditions. The specimen features crisp cubic fluorite crystals perched on matrix with smaller secondary crystals, giving it a balanced cabinet display aesthetic.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWeardale fluorites are among the most celebrated fluorites in the world, prized for their vivid color zoning, daylight fluorescence, and exceptional crystal form.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis rare pocket material is highly sought after by collectors due to its limited production and unique optical properties.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHighlights\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Rare tenebrescent color-changing fluorite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Color shift from green to blue depending on light exposure\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Sharp cubic fluorite crystal habit\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• From the famous Hidden Forest Pocket\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Collected from the Diana Maria Mine, Weardale, England\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Exceptional collector specimen from a world-renowned fluorite locality\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Strong daylight and UV fluorescence typical of Weardale fluorite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Attractive cluster composition with secondary crystals on matrix\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Cabinet specimen ideal for display or advanced mineral collections\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMineral: Fluorite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChemical Formula: CaF₂\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCrystal System: Isometric (cubic)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eColor: Forest green shifting to deep blue\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLuster: Vitreous\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransparency: Transparent to translucent\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHabit: Cubic crystals on matrix\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTenebrescence: Yes (color-changing)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLocality: Hidden Forest Pocket, Diana Maria Mine, Frosterley, Weardale, County Durham, England\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpecimen Type: Cabinet mineral specimen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eDimensions can be found in product listing photos.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMore Detailed Description\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis stunning specimen showcases the extraordinary mineralogical beauty that the Northern Pennines fluorite district is famous for. The fluorite crystals grow in classic cubic formations with clean edges and glassy faces, creating a geometric display of natural perfection.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhat makes this piece especially remarkable is its tenebrescent optical behavior—a property where the crystal color visibly shifts depending on lighting conditions. Under indoor lighting the fluorite appears a vibrant forest green, but when exposed to sunlight or UV light the cubes transform into rich blue hues, producing a dramatic and captivating visual effect.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe specimen originates from the Hidden Forest Pocket, a discovery known for producing fluorite crystals coated in calcite that concealed vivid green crystals underneath until preparation revealed them.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe composition is aesthetically balanced, with multiple cubic fluorite crystals clustered naturally across the matrix. Secondary crystals and subtle mineral inclusions add depth and texture while preserving the visual dominance of the fluorite cubes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpecimens from this pocket are increasingly scarce and are quickly absorbed into private collections due to their rare optical properties and limited production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLocality\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHidden Forest Pocket\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDiana Maria Mine\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrosterley, Weardale\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCounty Durham\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEngland, United Kingdom\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Diana Maria Mine sits in the historic Weardale mining district, an area famous for producing some of the finest fluorite specimens in the world.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGeological Formation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe fluorite crystals formed in hydrothermal mineral veins associated with historic lead-zinc mineralization in the Northern Pennines ore field.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMineral-rich fluids moved through fractures in the surrounding limestone and deposited fluorite crystals as they cooled. Over time these crystals grew into the sharply defined cubic forms seen in this specimen.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMineralogy Information\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFluorite is a calcium fluoride halide mineral that crystallizes in the isometric crystal system and commonly forms cubes, octahedra, or combinations of both.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTrace elements and structural defects within the crystal lattice are responsible for fluorite’s wide range of colors and its fluorescent and tenebrescent properties.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAssociated minerals in the Weardale district often include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Calcite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Quartz\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Galena\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Barite\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Rare tenebrescent fluorite crystals\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Dramatic green-to-blue color change\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Classic cubic crystal geometry\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• From a famous UK fluorite locality\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Limited-production pocket material\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Highly aesthetic cabinet display specimen\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGeological Era\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCarboniferous Period\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eApproximately 300–330 million years ago, when mineralizing fluids circulated through the limestone formations of the Northern Pennines ore field.\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMineral Class\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHalides\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRock Formation\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFluorite formed within hydrothermal veins cutting through Carboniferous limestone in the Northern Pennines lead-zinc mineral district.\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHistorical \u0026amp; Folklore Stories\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Weardale region has a mining history dating back to medieval times. The area became famous during the 18th and 19th centuries for its rich lead and fluorspar deposits, attracting miners from across England and Cornwall.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFluorite from this region helped inspire the term “fluorescence”, because specimens from these mines glow brightly under ultraviolet light due to trace europium impurities.\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eToday, Weardale fluorite is considered among the finest collector fluorite specimens on Earth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhy Collectors Love It\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCollectors are drawn to this specimen for several reasons:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Rare tenebrescent color change\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Classic cubic crystal form\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Historic and famous Weardale locality\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Limited production from the Hidden Forest Pocket\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Exceptional visual display quality\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor fluorite collectors, pieces from the Diana Maria Mine represent modern classics in the mineral world.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisplay \u0026amp; Care Instructions\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFluorite is a relatively soft mineral (Mohs hardness 4) and should be handled with care.\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDisplay Tips:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Keep in a stable display case\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Avoid prolonged direct sunlight to preserve color\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Use LED lighting to enhance crystal clarity\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCleaning:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Dust gently with compressed air or a soft brush\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Avoid harsh chemicals or ultrasonic cleaners\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eShipping \u0026amp; Handling\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eYour specimen will be professionally packed using collector-grade mineral packaging techniques to ensure safe transit.\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Carefully wrapped and padded\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Insured shipping included\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Tracking provided\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Ships within 1–2 business days\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eWe treat every specimen as if it were going into our own collection.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA Metaphysical Nod\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile metaphysical interpretations are belief-based and not scientific, fluorite has long been appreciated in spiritual traditions for its calming and clarifying energy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMany believe fluorite can support:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Mental clarity\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Emotional balance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Focus and organization\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Protection from chaotic energies\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGreen fluorite is often associated with the Heart Chakra, encouraging growth, renewal, and harmony.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuggested mantra:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e“I allow clarity and balance to guide my thoughts and actions.”\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhy Trust Wandering Stones\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt Wandering Stones, we are passionate mineral collectors who believe in education, authenticity, and community.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhen you purchase from us you can expect:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Carefully sourced natural mineral specimens\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Accurate locality and mineral information\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Professional packaging and fast shipping\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• Transparent and honest descriptions\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e• A trusted name among mineral collectors\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe proudly bring you everything crystals, rocks, minerals, and geology—from the common to the ultra rare.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003efluorite, weardale fluorite, diana maria mine fluorite, hidden forest pocket fluorite, england fluorite specimen, tenebrescent fluorite, color changing fluorite, daylight fluorescent fluorite, uv reactive fluorite, green fluorite cube, blue fluorite cube, cubic fluorite crystals, fluorite cabinet specimen, fluorite collector mineral, british fluorite specimen, county durham fluorite, frosterley fluorite, northern pennines minerals, uk fluorite crystals, rare fluorite specimen, fluorite mineral cluster, fluorite crystal cluster, fluorite on matrix, hydrothermal fluorite crystal, fluorite mineral specimen uk, fluorescent fluorite crystal, weardale mineral specimen, collectible fluorite crystal, fluorite mineral cabinet piece, fluorite mineral display specimen, mineral collector fluorite, fluorite mineral geometry, cubic crystal fluorite specimen, high grade fluorite specimen, fluorite mineral cluster england, england mineral specimen, fluorite mineral rarity, fluorite geological specimen, fluorite crystal formation, fluorite mineral display piece, fluorite mineral for collectors, fluorite mineral specimen natural, fluorite mineral cube cluster, fluorite with matrix specimen, natural fluorite crystals england, weardale mineral district fluorite, historic mining fluorite specimen, england hydrothermal fluorite, fluorite mineral halide, CaF2 crystal specimen, fluorescent minerals fluorite, fluorite fluorescence mineral, ultraviolet reactive mineral fluorite, crystal cube fluorite mineral, mineral cabinet fluorite england, fluorite color zoning specimen, fluorite optical specimen, fluorite mineral rarity uk, england fluorite cubes, mineral display fluorite specimen, fluorite natural crystal formation, fluorite mineralogy specimen, fluorite halide mineral crystal, fluorite geological formation specimen, fluorite collector grade mineral, fluorite specimen weardale district, fluorite mine specimen england, fluorite england collectible, fluorite matrix specimen collector, fluorite crystal cluster natural, fluorite mineral locality england, fluorite specimen northern england, rare mineral specimen fluorite, fluorite crystal cabinet display, fluorite crystal collector mineral, fluorite gemstone mineral specimen, fluorite crystal formation natural, fluorite mineral natural cube crystal, fluorite specimen natural england, fluorite cube cluster collector specimen, fluorite museum quality specimen, fluorite mineral showcase specimen, fluorite mineral rarity specimen, fluorite green blue color change mineral, tenebrescent mineral specimen fluorite\u003c\/span\u003e\u003c\/p\u003e","brand":"Wandering Stones","offers":[{"title":"Default Title","offer_id":43370790191163,"sku":"XX44","price":149.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0365\/5358\/8795\/files\/3D2728C1-2745-45B1-B157-B81994F3C44D.jpg?v=1774989460","url":"https:\/\/wanderingstones.com\/products\/rare-tenebrescent-color-changing-cubic-fluorite-hidden-forest-pocket-diana-maria-mine-frosterley-weardale-county-durham-england","provider":"Wandering Stones","version":"1.0","type":"link"}