{"product_id":"uv-reactive-septarian-polished-slab-madagascar-0-67-lbs","title":"UV-Reactive Septarian Polished Slab – Madagascar – 0.67 lbs","description":"\u003cp data-start=\"87\" data-end=\"461\" class=\"PDq2pG_selectionAnchorContainer\"\u003eA striking two-sided polished Septarian Slab from Madagascar, featuring a dramatic network of golden calcite-filled fractures surrounded by deep brown mineral borders and contrasting gray limestone sections. Both broad faces have been polished, allowing the specimen’s naturally divided patterns and internal mineral structure to be appreciated from multiple viewing angles.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"463\" data-end=\"872\"\u003eThe slab displays the classic appearance that makes Madagascar septarian highly recognizable. Angular gray host-rock sections are separated by branching brown seams, while translucent honey-yellow calcite fills several larger fractures and cavities. Under direct lighting, the calcite reveals internal cleavage patterns and a warm luminous glow that contrasts beautifully with the matte-looking gray sections.\u003c\/p\u003e\n\u003cp data-start=\"874\" data-end=\"1168\"\u003eThis specimen is also UV reactive. Fluorescence is concentrated within responsive mineral areas—most commonly the calcite—creating a second display appearance under ultraviolet illumination. The visible color and intensity may vary depending on the wavelength and strength of the UV light used.\u003c\/p\u003e\n\u003cp data-start=\"1170\" data-end=\"1496\"\u003eMeasuring approximately 5 × 0.5 × 5.5 inches and weighing 0.67 pounds, this substantial slab provides excellent cabinet presence without requiring a large display footprint. Its two polished faces, natural outer edges, bold fracture pattern, translucent calcite, and fluorescence make it an appealing geological display piece.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1a3ueyz\" data-start=\"1498\" data-end=\"1515\"\u003eSpecifications\u003c\/h2\u003e\n\u003cp data-start=\"1517\" data-end=\"1572\"\u003eMaterial: Septarian stone with calcite-filled fractures\u003c\/p\u003e\n\u003cp data-start=\"1574\" data-end=\"1612\"\u003eSpecimen Type: Two-sided polished slab\u003c\/p\u003e\n\u003cp data-start=\"1614\" data-end=\"1634\"\u003eLocality: Madagascar\u003c\/p\u003e\n\u003cp data-start=\"1636\" data-end=\"1678\"\u003eWeight: 0.67 lbs (approximately 304 grams)\u003c\/p\u003e\n\u003cp data-start=\"1680\" data-end=\"1726\"\u003eDimensions: Approximately 5 × 0.5 × 5.5 inches\u003c\/p\u003e\n\u003cp data-start=\"1728\" data-end=\"1790\"\u003eColor: Gray, dark brown, golden yellow, cream, and honey tones\u003c\/p\u003e\n\u003cp data-start=\"1792\" data-end=\"1890\"\u003ePrimary Features: Contrasting septarian pattern with translucent calcite-filled veins and cavities\u003c\/p\u003e\n\u003cp data-start=\"1892\" data-end=\"1950\"\u003eFinish: Both broad faces polished with natural outer edges\u003c\/p\u003e\n\u003cp data-start=\"1952\" data-end=\"2028\"\u003eUV Response: Fluorescent mineral areas; appearance may vary by UV wavelength\u003c\/p\u003e\n\u003cp data-start=\"2030\" data-end=\"2098\"\u003eTransparency: Opaque host material with translucent calcite sections\u003c\/p\u003e\n\u003cp data-start=\"2100\" data-end=\"2212\"\u003eCondition: Natural stone slab with inherent fractures, mineral contacts, surface variations, and irregular edges\u003c\/p\u003e\n\u003cp data-start=\"2214\" data-end=\"2270\"\u003eDisplay: Freestanding or stand-mounted collector display\u003c\/p\u003e\n\u003cp data-start=\"2272\" data-end=\"2292\"\u003eExact specimen shown\u003c\/p\u003e\n\u003ch2 data-section-id=\"vcxcoc\" data-start=\"2294\" data-end=\"2318\"\u003eAbout Septarian Stone\u003c\/h2\u003e\n\u003cp data-start=\"2320\" data-end=\"2609\"\u003eSeptarian stone is a lapidary and collector name applied to concretions or nodules containing distinctive networks of mineral-filled fractures. The name derives from the Latin word \u003cem data-start=\"2501\" data-end=\"2509\"\u003eseptum\u003c\/em\u003e, meaning partition, referring to the naturally divided appearance created by these internal cracks.\u003c\/p\u003e\n\u003cp data-start=\"2611\" data-end=\"3024\"\u003eSeptarian formations developed as mineral-rich sediment hardened around a central mass. Shrinkage and other geological stresses produced fractures within the concretion, which were later filled by minerals carried through the surrounding sediment. Calcite commonly forms the golden-yellow crystalline areas, while brown mineral layers and gray carbonate-rich host material create the familiar contrasting pattern.\u003c\/p\u003e\n\u003cp data-start=\"3026\" data-end=\"3277\"\u003eWhen a septarian nodule is cut and polished, its internal fracture system becomes visible as an intricate natural mosaic. No two slabs share the same arrangement, making each piece a unique record of sedimentary formation and later mineral deposition.\u003c\/p\u003e\n\u003cp data-start=\"3279\" data-end=\"3565\"\u003eCalcite can fluoresce under ultraviolet light when trace elements or structural defects activate its response. Fluorescence can differ considerably under longwave and shortwave UV illumination, so photographs taken with one lamp may not perfectly represent its appearance under another.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1punl39\" data-start=\"3567\" data-end=\"3585\"\u003eCollector Notes\u003c\/h2\u003e\n\u003cp data-start=\"3587\" data-end=\"3610\"\u003eThis specimen features:\u003c\/p\u003e\n\u003cul data-start=\"3612\" data-end=\"4127\"\u003e\n\u003cli data-section-id=\"1haerjj\" data-start=\"3612\" data-end=\"3656\"\u003eNatural septarian material from Madagascar\u003c\/li\u003e\n\u003cli data-section-id=\"sts1sm\" data-start=\"3657\" data-end=\"3691\"\u003eTwo broad polished display faces\u003c\/li\u003e\n\u003cli data-section-id=\"1kfs7kq\" data-start=\"3692\" data-end=\"3742\"\u003eDramatic gray and dark brown partitioned pattern\u003c\/li\u003e\n\u003cli data-section-id=\"h2r50k\" data-start=\"3743\" data-end=\"3786\"\u003eTranslucent honey-yellow calcite sections\u003c\/li\u003e\n\u003cli data-section-id=\"12xur8c\" data-start=\"3787\" data-end=\"3845\"\u003eVisible calcite cleavage and internal crystalline detail\u003c\/li\u003e\n\u003cli data-section-id=\"1lia7hl\" data-start=\"3846\" data-end=\"3873\"\u003eUV-reactive mineral areas\u003c\/li\u003e\n\u003cli data-section-id=\"duygcz\" data-start=\"3874\" data-end=\"3932\"\u003eDifferent appearance under visible and ultraviolet light\u003c\/li\u003e\n\u003cli data-section-id=\"ekin3x\" data-start=\"3933\" data-end=\"3962\"\u003eNatural irregular perimeter\u003c\/li\u003e\n\u003cli data-section-id=\"19j5szc\" data-start=\"3963\" data-end=\"4009\"\u003eSubstantial size with a slim display profile\u003c\/li\u003e\n\u003cli data-section-id=\"oraosp\" data-start=\"4010\" data-end=\"4055\"\u003eAttractive geological pattern on both sides\u003c\/li\u003e\n\u003cli data-section-id=\"1vj2cu1\" data-start=\"4056\" data-end=\"4101\"\u003eOne-of-a-kind sedimentary mineral formation\u003c\/li\u003e\n\u003cli data-section-id=\"1bmwm75\" data-start=\"4102\" data-end=\"4127\"\u003eExact specimen pictured\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4129\" data-end=\"4365\"\u003ePerfect for collectors of septarian nodules, Madagascar minerals, fluorescent minerals, UV-reactive specimens, calcite, polished slabs, sedimentary formations, natural stone décor, geological displays, and distinctive cabinet specimens.\u003c\/p\u003e\n\u003cp data-start=\"4367\" data-end=\"4417\"\u003eProfessionally packaged and shipped from Colorado.\u003c\/p\u003e\n\u003cp data-start=\"4419\" data-end=\"4461\"\u003eYou will receive the exact specimen shown.\u003c\/p\u003e\n\u003cp data-start=\"4463\" data-end=\"4598\"\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":49730207187194,"sku":null,"price":38.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/2328\/8826\/files\/UV-ReactiveSeptarianPolishedSlab_Madagascar_0.67lbs_5.jpg?v=1784671770","url":"https:\/\/serenitysoulstones.com\/products\/uv-reactive-septarian-polished-slab-madagascar-0-67-lbs","provider":"Serenity Soul Stones","version":"1.0","type":"link"}