{"product_id":"goethite-limonite-after-marcasite-polished-yorkshire-specimen","title":"Goethite \u0026 Limonite After Marcasite – Polished Yorkshire Pseudomorph Specimen.","description":"\u003cp\u003e\u003cb\u003eDESCRIPTION \u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA striking \u003cstrong\u003eGoethite and Limonite pseudomorph after Marcasite\u003c\/strong\u003e, featuring a beautifully polished edge that reveals the internal transformation of the specimen. The polished cross‑section shows the golden sparkle of the original Marcasite still preserved within, while the exterior displays a metallic silver‑grey sheen typical of fully oxidised Goethite and Limonite. The effect is like a geological time capsule — the life stages of the pseudomorph frozen in place.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis specimen showcases excellent contrast between the polished and natural surfaces, offering both scientific interest and strong display aesthetics. The internal Marcasite remnants visible in the polished face make this piece particularly desirable for collectors who appreciate the oxidation process and the story it tells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOrigin\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis specimen originates from \u003cstrong\u003eYorkshire, UK\u003c\/strong\u003e, a region renowned for its historic mining spoil heaps scattered across the \u003cstrong\u003eYorkshire Dales National Park\u003c\/strong\u003e. The most notable occurrences are found in the shallow dumps of \u003cstrong\u003eSwaledale and Wensleydale\u003c\/strong\u003e, where centuries of weathering transformed iron sulphides such as Marcasite and Pyrite into Goethite and Limonite while preserving their original crystal architecture.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCollectors prize Yorkshire pseudomorphs for their geological history, rarity, and the way they capture the oxidation process in remarkable detail — especially specimens like this one, where a polished face reveals the golden Marcasite core transitioning into iron oxide.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eFinish\u003cbr\u003e\u003c\/strong\u003eNatural, polished face, Freeform Specimen.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e12cm x 9cm x 3cm at widest points (approximately)\u003c\/li\u003e\n\u003cli\u003e0.466kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003e\u003cstrong\u003eImportant Information\u003c\/strong\u003e \u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-weight: 400;\"\u003eThe item pictured is the exact item you will receive. \u003c\/span\u003ePlease pay attention to the actual size given in the listing as the pictures are generally enlarged to show details. Colour may be a little different due to the colour calibration of each individual monitor or light levels.\u003c\/p\u003e","brand":"Agate Bands","offers":[{"title":"Default Title","offer_id":41233592910007,"sku":"3592910007","price":40.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/2818\/7063\/products\/20220525_180618copy2.jpg?v=1685497695","url":"https:\/\/agatebands.co.uk\/products\/goethite-limonite-after-marcasite-polished-yorkshire-specimen","provider":"Agate Bands","version":"1.0","type":"link"}