{"product_id":"goethite-after-marcasite-polished-yorkshire-specimen","title":"Goethite After Marcasite – Polished Yorkshire Pseudomorph Specimen","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDescription\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA beautiful \u003cstrong\u003eGoethite after Marcasite pseudomorph\u003c\/strong\u003e featuring sharply preserved crystal forms and a \u003cstrong\u003epolished display face\u003c\/strong\u003e that highlights the specimen’s natural metallic lustre and internal texture. The polished surface reveals the rich iron‑oxide sheen characteristic of Yorkshire Goethite, while the remaining natural areas retain the rugged, earthy appearance typical of historic mining localities in the region.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis is a \u003cstrong\u003etrue pseudomorph\u003c\/strong\u003e, where the original Marcasite crystal structure has been completely replaced by Goethite while maintaining the original form. The result is a mineral with strong geological significance and excellent display aesthetics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGoethite pseudomorphs after Marcasite are \u003cstrong\u003ehighly prized by collectors in Yorkshire\u003c\/strong\u003e, where historic mining districts produced some of the UK’s most recognisable iron sulphide replacements. Over centuries of natural oxidation, Marcasite transformed fully into Goethite, preserving the crystal architecture in remarkable detail.\u003c\/span\u003e\u003c\/p\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 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 long‑term weathering of iron sulphides created distinctive Goethite pseudomorphs after Marcasite.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCollectors value these Yorkshire specimens for their rarity, geological history, and the way they preserve the original Marcasite crystal shapes — making them some of the most iconic iron oxide pseudomorphs in the UK.\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\u003e15cm x 11cm x 4cm at widest points (approximately)\u003c\/li\u003e\n\u003cli\u003e0.746kg\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":41022973771959,"sku":"2973771959","price":30.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/2818\/7063\/products\/20211216_235817copy.jpg?v=1685497819","url":"https:\/\/agatebands.co.uk\/products\/goethite-after-marcasite-polished-yorkshire-specimen","provider":"Agate Bands","version":"1.0","type":"link"}