{"product_id":"prehnite-polished-sphere-w-druzy-caves","title":"Prehnite Polished Sphere w\/ Druzy Caves (40mm)","description":"\u003cp data-start=\"424\" data-end=\"478\"\u003eThese prehnite spheres are small worlds in themselves.\u003c\/p\u003e\n\u003cp data-start=\"480\" data-end=\"841\"\u003ePrehnite is a calcium aluminum silicate mineral that forms in the cavities of volcanic rock, often growing slowly along fractures and voids where hot, mineral-rich fluids once moved through the stone. As those fluids cooled, crystals formed inward—layer by layer—sometimes leaving behind druzy pockets, crystalline “caves,” and natural inclusions sealed inside.\u003c\/p\u003e\n\u003cp data-start=\"843\" data-end=\"1108\"\u003eMany of these spheres feature open crevices and internal crystal growth, offering a glimpse into the stone’s original formation. The surface has been polished smooth, while the interior remains textured and raw—preserving the contrast between refinement and origin. \u003cmeta charset=\"utf-8\"\u003ePrehnite is an uncommon mineral, but well-formed, polished spheres with natural internal cavities are relatively rare.\u003c\/p\u003e\n\u003cp data-start=\"1110\" data-end=\"1374\"\u003eThese pieces come from \u003cstrong\u003eAfrica\u003c\/strong\u003e, where prehnite commonly occurs in basalt-hosted deposits associated with ancient volcanic activity. Each sphere represents a moment in deep geological time: pressure, heat, water, and patience working together over millions of years.\u003c\/p\u003e\n\u003cp data-start=\"1376\" data-end=\"1560\"\u003eNo two are alike. Some are pale and translucent. Most contain darker mineral inclusions, most commonly epidote, which formed alongside the prehnite during its growth and are a natural part of the stone’s structure. \u003cmeta charset=\"utf-8\"\u003eSome spheres feature natural druzy cavities—areas where small prehnite crystals formed inside the stone as it developed, creating a raw, crystalline interior. \u003cstrong\u003eD\u003c\/strong\u003e\u003cstrong data-start=\"333\" data-end=\"395\"\u003eruzy in prehnite often looks soft, sugary, or cavern-like\u003c\/strong\u003e, not spiky.\u003c\/p\u003e\n\u003cp data-start=\"1376\" data-end=\"1560\"\u003e\u003cstrong\u003eThis listing is for one intuitively chosen sphere (around 40mm).\u003c\/strong\u003e\u003cstrong data-start=\"1562\" data-end=\"1574\"\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Africa","offers":[{"title":"Default Title","offer_id":46111619580057,"sku":null,"price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0649\/3224\/9753\/files\/IMG_9148.jpg?v=1769448081","url":"https:\/\/mineralchapel.com\/products\/prehnite-polished-sphere-w-druzy-caves","provider":"Mineral Chapel","version":"1.0","type":"link"}