{"product_id":"septarian-sphere","title":"Septarian Sphere","description":"\u003cp\u003eThis sphere is carved from septarian, a unique rock formed from a combination of minerals including calcite, aragonite, and limestone. Septarian nodules develop when mineral-rich mud cracks and fills with calcite or aragonite over millions of years, creating striking patterns of yellow, brown, and gray.\u003c\/p\u003e\n\u003cp\u003eDetails:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: Septarian (limestone with calcite and aragonite)\u003c\/li\u003e\n\u003cli\u003eSize: Approximately 2 to 2.5 inches in diameter\u003c\/li\u003e\n\u003cli\u003eAppearance: Polished sphere displaying contrasting yellow calcite, brown aragonite, and gray limestone in natural crack-like patterns\u003c\/li\u003e\n\u003cli\u003eFormation: Forms from ancient marine sediment that hardened, cracked, and later filled with mineral deposits\u003c\/li\u003e\n\u003cli\u003ePhysical Properties: Mohs hardness 3–4.5 depending on mineral composition; smooth polished surface\u003c\/li\u003e\n\u003cli\u003eEducational Value: Demonstrates sedimentary rock processes, mineral infill in natural cracks, and the combination of multiple minerals in a single specimen\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis septarian sphere combines geological history with striking natural patterns, making it both a decorative object and an engaging educational specimen.\u003c\/p\u003e","brand":"The Science Museum of Minnesota","offers":[{"title":"Default Title","offer_id":47804308914411,"sku":"R2999","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/2187\/1339\/files\/0-Edited-2025-10-02T130000.247.png?v=1770861755","url":"https:\/\/relicreef.com\/products\/septarian-sphere","provider":"Relic Reef","version":"1.0","type":"link"}