{"title":"Tenebrescent Gemstones","description":"\u003cp\u003eTenebrescence is a reversible color change caused by light: the stone takes on color or darkens under ultraviolet light, then slowly fades back in ordinary daylight, and the cycle can be repeated again and again. The best known tenebrescent mineral is hackmanite, a sulfur-bearing variety of sodalite (Na\u003csub\u003e8\u003c\/sub\u003eAl\u003csub\u003e6\u003c\/sub\u003eSi\u003csub\u003e6\u003c\/sub\u003eO\u003csub\u003e24\u003c\/sub\u003e(Cl,S)\u003csub\u003e2\u003c\/sub\u003e), which turns pink to purple after a short time under a UV lamp or in strong sunlight.\u003c\/p\u003e\u003ch3\u003eAbout tenebrescence\u003c\/h3\u003e\u003cp\u003eThe word comes from the Latin tenebrae, darkness. Hackmanite is named after the Finnish geologist Victor Hackman. The color comes from color centers linked to sulfur in the crystal structure: ultraviolet light activates them, and visible light returns them to their resting state, without any lasting change to the stone. Hackmanite is found in Afghanistan, Myanmar, Canada, Greenland and Russia, among other places, and a few other minerals, such as tugtupite, show the same effect.\u003c\/p\u003e\u003ch3\u003eWhat you'll find in this collection\u003c\/h3\u003e\u003cp\u003eHackmanite in two forms: rough pieces from a few grams to around 20 grams, white, lavender or pale pink in daylight, and polished spheres of 58 to 65mm. All of them turn purple after UV exposure and glow a strong orange under a 365nm UV flashlight, so they suit fluorescent mineral collections as well.\u003c\/p\u003e\u003ch3\u003eHow to recognise tenebrescence\u003c\/h3\u003e\u003cp\u003eShine a UV lamp on the stone for a minute or two, or leave it in strong sunlight: the color deepens to pink or purple. Under white light it fades again, within minutes to several hours depending on the piece. Under longwave UV (365nm) hackmanite also fluoresces a strong orange, a separate effect that shows only while the lamp is on.\u003c\/p\u003e\u003ch3\u003eCaring for hackmanite\u003c\/h3\u003e\u003cp\u003eWith a hardness of 5.5 to 6, hackmanite is softer than quartz, so store it apart from harder stones. Clean it with lukewarm water and a soft cloth, and avoid ultrasonic cleaners and harsh chemicals. The color fading in daylight is normal and does no harm: a few minutes under UV brings it back.\u003c\/p\u003e\u003cp\u003eEvery stone is natural, and each listing gives its weight, size, origin and treatment, with photos of the actual stone.\u003c\/p\u003e","products":[{"product_id":"hackmanite-tenebrescent-sodalite-14-4g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 14.4g Fluorescent","description":"\u003cp\u003eA rough hackmanite specimen with a soft pale lavender-mauve hackmanite zone in the upper portion, graduating into warm beige-tan feldspar matrix below. The rough, naturally cleaved surfaces show the blocky crystalline character of the mineral. In white light the hackmanite reads as a gentle, muted lavender rather than a saturated purple. After UV exposure the hackmanite zone deepens considerably, shifting to a richer, more saturated purple that is visibly stronger than the resting state. Under longwave UV (365nm) the stone glows brilliant orange-yellow across most of the surface, with a darker non-fluorescent patch in the lower-center where the feldspar matrix content is higher.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is the reversible photochromic property that defines hackmanite: after time in ordinary light the mineral appears white to pale grey; UV light or sunlight shifts it toward pink or violet, and ordinary visible light gradually bleaches it back to pale, while in darkness the color holds. The cycle repeats without limit and without any change to the mineral's structure. From Badakhshan, Afghanistan, the primary global source for tenebrescent hackmanite. The contrast between the orange-fluorescing hackmanite zones and the dark non-fluorescent feldspar in the 365nm photo makes the mineral distribution within the host rock easy to read at a glance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural hackmanite (tenebrescent sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 14.4g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 34.4x23x16mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Pale lavender (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406233878853,"sku":"ot1459-1","price":23.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-144g-fluorescent.jpg?v=1756321203"},{"product_id":"hackmanite-tenebrescent-sodalite-18-1g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 18.1g Fluorescent","description":"\u003cp\u003eA substantial hackmanite rough with a large rounded hackmanite mass occupying the central and right portion of the piece, showing a relatively deep violet-purple even in white light. The sandy-white and orange-buff feldspar matrix is visible on the left side and edges, providing a clear boundary against the hackmanite zone. After UV exposure the hackmanite deepens further to a richer, more saturated purple-violet, with the matrix picking up faint lavender tinting at the edges where trace hackmanite is present. Under longwave UV (365nm) the piece fluoresces intense orange-red across the hackmanite zone. Under midwave UV (310nm) the response shifts to a completely different color: a deep blue-violet at the hackmanite core transitioning to pink-magenta toward the outer zones.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's defining optical property: a reversible photochromic shift from white or pale grey in its light-bleached state to pink or violet under UV or sunlight, bleaching back in ordinary visible light without any permanent change, while in darkness the color holds. The two separate UV responses in this specimen, strong orange at 365nm and blue-violet to pink at 310nm, are independent phenomena driven by different excitation wavelengths; together they represent the specimen's full fluorescence range across two UV sources. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 18.1g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 34x27x18mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Violet purple (white light); deep purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange-red (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (310nm):\u003c\/strong\u003e Blue-violet, pink\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406233911621,"sku":"ot1459-2","price":28.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-181g-fluorescent.jpg?v=1756321202"},{"product_id":"hackmanite-tenebrescent-sodalite-5g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 5g Fluorescent","description":"\u003cp\u003eA compact hackmanite specimen at 5g with the hackmanite mineral making up most of the visible body. In white light the piece shows predominantly soft lavender-violet with a small section of pale beige host rock at the top. The hackmanite coverage is generous relative to the size, with little matrix interrupting the main face. After UV exposure the lavender deepens to a fuller purple-violet across the body. Under longwave UV (365nm) the stone glows strong orange across the full surface.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is the reversible color change from white or pale grey after time in ordinary light to pink or violet under UV light or sunlight, fading back in ordinary indoor light; kept in the dark, the color holds. The cycle repeats indefinitely without altering the mineral's structure. The high proportion of hackmanite relative to matrix in this piece means a clean, uninterrupted color shift with minimal pale areas: useful both as a study specimen and as a compact raw reference alongside polished examples. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 24x17x11mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Lavender (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406233977157,"sku":"ot1459-9","price":8.2,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-5g-fluorescent.jpg?v=1756321201"},{"product_id":"hackmanite-tenebrescent-sodalite-6-8g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 6.8g Fluorescent","description":"\u003cp\u003eA flat, elongated hackmanite specimen where the white-light appearance is dominated by warm beige-tan matrix, with a diagonal zone of soft pale pink-rose running across the left-center portion. The hackmanite color in white light is a muted, washed-out blush rather than a saturated purple, indicating a lower activation state in its ambient resting condition. After UV exposure the hackmanite zone shifts considerably: the pale rose deepens to a clear purple-violet and spreads more broadly, giving the piece a much stronger visual presence than in daylight. Under longwave UV (365nm) the stone fluoresces brilliant orange-yellow across the full surface. Under midwave UV (310nm) the response is a vivid pink-red to magenta-red glow.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible color shift: white or pale grey after time in ordinary light, pink to violet after UV or sunlight, bleaching back in ordinary light without any permanent change to the mineral. This piece illustrates well how the ambient-light and tenebrescent states can differ substantially: what reads as a low-saturation, largely matrix-dominated specimen in white light transforms into a clearly purple stone after UV activation, while the fluorescence under both 365nm and 310nm is strong regardless of the ambient color. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.8g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 28x24x15mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Pale pink (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (310nm):\u003c\/strong\u003e Pink-red\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406234009925,"sku":"ot1459-3","price":11.8,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-68g-fluorescent.jpg?v=1756321201"},{"product_id":"hackmanite-tenebrescent-sodalite-7-6g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 7.6g Fluorescent","description":"\u003cp\u003eA compact hackmanite specimen with broad, even hackmanite coverage: in white light a soft pink-mauve occupies most of the main face, with only a small section of grey-beige feldspar matrix visible at the lower right corner. The hackmanite distribution is relatively even across the surface, which is notable for a rough specimen of this size. After UV exposure the pink-mauve deepens to a saturated purple-violet across nearly the full face. Under longwave UV (365nm) the piece fluoresces brilliant yellow-orange with near-complete, evenly distributed coverage. Under midwave UV (310nm) the response is a uniform bright magenta-pink covering the entire face with little variation.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible photochromic response: the mineral reads white to pale grey in its light-bleached state, shifts to pink or violet under UV light or sunlight, and bleaches back in ordinary visible light, repeating the cycle without limit. The broad and even hackmanite distribution across this specimen's face means the color change is visible over a large surface area with minimal matrix interruption; the 310nm response in particular demonstrates uniform coverage, with the entire face responding in the same color. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 7.6g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 27x19x12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Pink mauve (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (310nm):\u003c\/strong\u003e Bright magenta-pink\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406234042693,"sku":"ot1459-6","price":11.8,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-76g-fluorescent.jpg?v=1756321200"},{"product_id":"hackmanite-tenebrescent-sodalite-7-7g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 7.7g Fluorescent","description":"\u003cp\u003eA hackmanite rough with a notably cool blue-lavender color in white light, covering the full body with very little visible matrix. The tone reads as periwinkle or blue-violet rather than the warmer pink-mauve typical of this material, giving it a distinctly different character among the specimens in this series. After UV exposure the color shifts to a warmer purple-violet, losing the cool blue quality and deepening toward a more conventional hackmanite purple. Under longwave UV (365nm) the piece fluoresces brilliant orange-yellow across the full surface.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is the reversible color change that distinguishes hackmanite from ordinary sodalite: white or pale grey after time in ordinary light, shifting to pink or violet under UV or sunlight, bleaching back in ordinary light. The cool blue-lavender white-light tone of this specimen is an expression of the hackmanite's individual crystal chemistry rather than a different mineral; the tenebrescent shift and the strong orange fluorescence at 365nm confirm the identification. The shift from a cool blue-lavender in white light to a warm purple after UV is itself an additional visual dimension not seen in the warmer-toned specimens. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 7.7g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 30x16x17mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Blue-lavender (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406234075461,"sku":"ot1459-5","price":12.8,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-77g-fluorescent.jpg?v=1756321199"},{"product_id":"hackmanite-tenebrescent-sodalite-9-4g-fluorescent","title":"Natural Hackmanite (Tenebrescent Sodalite) 9.4g Fluorescent","description":"\u003cp\u003eA blocky hackmanite specimen with a pale lavender-mauve hackmanite zone concentrated in the center and lower portion of the piece, framed by pale cream-white host rock above and a calcite-rich zone at the base. In white light the hackmanite reads as a soft, muted lavender against the surrounding pale matrix, with the calcite at the base appearing bright white. After UV exposure the hackmanite zone deepens to a clear purple-violet while the pale host rock above remains largely unchanged, making the mineral boundary more visually distinct. Under longwave UV (365nm) the hackmanite fluoresces strong orange-yellow, while the calcite-rich zone at the base contributes a separate white-pink glow from a different mineral phase.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible photochromic shift from white or pale grey after time in ordinary light to pink or violet under UV or sunlight, bleaching back in ordinary light without limit. The calcite component visible at the base in the UV photo is a separate mineral with its own fluorescence, typical of Afghan hackmanite specimens where the host rock contains multiple mineral phases each responding differently to UV. The visible separation between the orange hackmanite zones and the white-pink calcite glow under 365nm provides a clear illustration of how multiple minerals coexist within the same host rock. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite) with Calcite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 9.4g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 24x19x17mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Pale lavender (white light); purple (after UV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong), white-pink in the calcite\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Rough\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 3-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406234108229,"sku":"ot1459-7","price":15.3,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/hackmanite-tenebrescent-sodalite-94g-fluorescent.jpg?v=1756321199"},{"product_id":"fluorescent-hackmanite-sphere-291g-58mm","title":"Natural Fluorescent Hackmanite Sphere 291g 58mm","description":"\u003cp\u003eA polished hackmanite sphere of 58mm and 291g. In white light the surface shows a pale cream-white base with scattered soft pink-lavender hackmanite zones, irregular patches of dark grey feldspar, rust-brown iron oxide spots distributed across the surface, and natural crack lines following the mineral structure. The patterning gives the sphere a distinctly planetary character in daylight. The pink-lavender zones are the hackmanite in its tenebrescent state, activated by ambient light exposure. Under longwave UV (365nm) the display shifts entirely: the feldspar matrix emits a blue-white fluorescence across much of the sphere, the hackmanite zones glow orange-pink, and dark non-fluorescent patches create contrast. The result is a multi-color UV display where two minerals within the same sphere respond in completely different colors.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible photochromic property: after time in ordinary light, the mineral appears white to pale grey; UV or sunlight shifts it to pink or violet, and ordinary indoor light bleaches it back. The pink-lavender zones on the daylight face are the hackmanite's tenebrescent color. The 365nm UV image reveals what the daylight view cannot: the multi-mineral composition of the host rock, with the blue-white fluorescing feldspar and the orange fluorescing hackmanite each occupying distinct zones. A sphere cut from a single mineral would glow uniformly; this one has two minerals glowing in different colors under the same UV source, which is what makes the display unusual. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 291g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 58mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White, pale pink, grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong), blue-white in the feldspar matrix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Sphere (polished)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite sphere, 58mm, tenebrescent, Afghanistan.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406349648197,"sku":"ot1183-3","price":46.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/fluorescent-hackmanite-sphere-291g-58mm.jpg?v=1756321049"},{"product_id":"fluorescent-hackmanite-sphere-58mm","title":"Natural Fluorescent Hackmanite Sphere 303g 58mm","description":"\u003cp\u003eA polished hackmanite sphere of 58mm and 303g. In white light the surface shows a pale white-grey base with distributed patches of soft purple-lavender, areas of grey-blue feldspar, and scattered rust-brown iron oxide inclusions. The purple-lavender hackmanite zones are somewhat more prominent across this sphere's surface than on the 291g companion at the same diameter. The pink-lavender zones are the hackmanite in its tenebrescent state. Under longwave UV (365nm) the display is a vivid multi-color response: the hackmanite zones emit bright orange-red covering a large and well-distributed portion of the surface, with the feldspar matrix glowing blue-teal in the surrounding areas and darker non-fluorescent patches providing contrast. The orange coverage on this sphere is more extensive than on the 291g companion.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible photochromic shift: white or pale grey after time in ordinary light, pink to violet after UV or sunlight, bleaching back in ordinary light. The purple-lavender zones visible in daylight are the tenebrescent state developed through ambient light during photography. At 303g this sphere is slightly heavier than the 291g companion despite the same diameter, indicating a denser mineral distribution; the greater orange coverage in the 365nm photo corresponds to the higher hackmanite content relative to non-fluorescing matrix. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 303g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 58mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White, pale purple, grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong), blue-teal in the feldspar matrix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Sphere (polished)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite sphere, 58mm, tenebrescent, Afghanistan.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406349680965,"sku":"ot1183-1","price":54.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/natural-fluorescent-hackmanite-sphere-58mm.jpg?v=1780784816"},{"product_id":"fluorescent-hackmanite-sphere-65mm","title":"Natural Fluorescent Hackmanite Sphere 65mm","description":"\u003cp\u003eThe largest of the hackmanite spheres at 65mm and 386g. In white light the surface shows pale white-grey with more prominent grey-blue feldspar zones than the 58mm companions, scattered soft purple-lavender hackmanite patches, and rust-brown iron oxide inclusions across the polished surface. The feldspar content is visibly higher here than in the smaller spheres. The purple-lavender zones are the hackmanite in its tenebrescent state. Under longwave UV (365nm) the display has a distinctive character: the feldspar matrix emits a broad blue-teal glow across much of the sphere, the hackmanite zones produce scattered orange-gold patches, and dark non-fluorescent areas create substantial contrast throughout. The proportion of dark non-fluorescent zones is higher here than in either 58mm sphere, giving this sphere the most complex and visually varied UV patterning of the three.\u003c\/p\u003e\n\u003cp\u003eTenebrescence is hackmanite's reversible color change from white or pale grey after time in ordinary light to pink or violet under UV or sunlight, bleaching back in ordinary light. The purple-lavender zones on the daylight surface are the tenebrescent state developed from ambient exposure. At 65mm and 386g this is the largest and heaviest sphere in the group; the broader feldspar distribution visible in daylight and the wider blue-teal coverage under UV both reflect the higher proportion of non-hackmanite host minerals relative to the smaller spheres. From Badakhshan, Afghanistan.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStone type:\u003c\/strong\u003e Natural Hackmanite (Tenebrescent Sodalite)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 386g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 65mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White, pale purple, grey-blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence (365nm):\u003c\/strong\u003e Orange (Strong), blue-teal in the feldspar matrix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenomenon:\u003c\/strong\u003e Tenebrescence\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut:\u003c\/strong\u003e Sphere (polished)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClarity:\u003c\/strong\u003e Opaque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e Untreated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Afghanistan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 5.5-6\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNatural hackmanite sphere, 65mm, tenebrescent, Afghanistan.\u003c\/p\u003e","brand":"Lapis Magica","offers":[{"title":"Default Title","offer_id":55406349713733,"sku":"ot1183-2","price":70.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/files\/natural-fluorescent-hackmanite-sphere-65mm.jpg?v=1780784815"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/8576\/8517\/collections\/hackmanite-tenebrescent-sodalite-181g-fluorescent.jpg?v=1792527915","url":"https:\/\/lapismagica.com\/collections\/tenebrescence.oembed","provider":"Lapis Magica","version":"1.0","type":"link"}