{"product_id":"goethite-after-marcasite-yorkshire-pseudomorph-specimen","title":"Goethite After Marcasite Pseudomorph – Partially Polished Yorkshire Specimen.","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA striking \u003cstrong\u003enegative impression pseudomorph of botryoidal Goethite after Marcasite\u003c\/strong\u003e, showing beautifully preserved crystal forms with a partially polished finish. The polished areas reveal the specimen’s natural sparkle and metallic lustre, while the unpolished surfaces retain the raw, earthy texture typical of Yorkshire iron oxide minerals. The contrast between polished and natural surfaces gives this piece exceptional character and display appeal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGoethite pseudomorphs after Marcasite are \u003cstrong\u003ehighly sought after by mineral collectors in Yorkshire\u003c\/strong\u003e, where historic mining districts produced some of the UK’s most iconic iron sulphide replacements. Over centuries of weathering, the original Marcasite oxidised completely into Goethite, yet the crystal shapes remained perfectly preserved — a classic example of pseudomorphism.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOrigin\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003eThis specimen comes from \u003cstrong\u003eYorkshire, UK\u003c\/strong\u003e, a region famous for its historic mining spoil heaps in the \u003cstrong\u003eYorkshire Dales National Park\u003c\/strong\u003e, particularly around \u003cstrong\u003eSwaledale and Wensleydale\u003c\/strong\u003e. These shallow dumps are known for producing distinctive Goethite pseudomorphs after Marcasite, formed through long‑term oxidation of iron sulphides. Collectors prize these pieces for their geological history, rarity, and unique botryoidal textures.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eFinish\u003cbr\u003e\u003c\/strong\u003ePartially Polished, Freeform Specimen.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e11cm x 10cm x 7.5cm at widest points (approximately)\u003c\/li\u003e\n\u003cli\u003e0.629kg\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":40987817312439,"sku":"7817312439","price":45.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/2818\/7063\/products\/20211128_010455copy.jpg?v=1685498274","url":"https:\/\/agatebands.co.uk\/products\/goethite-after-marcasite-yorkshire-pseudomorph-specimen","provider":"Agate Bands","version":"1.0","type":"link"}