{"title":"Goethite","description":"\u003cp\u003e\u003cstrong\u003eGoethite\u003c\/strong\u003e is an iron oxyhydroxide, FeO(OH), and the most common iron oxide species on Earth, forming through the weathering of iron-rich minerals in soils, gossans, and banded iron formations. Named after the German poet Johann Wolfgang von Goethe, it typically appears as botryoidal, reniform, or stalactitic masses of radiating fibrous crystals, though sharp acicular or bladed crystals are prized when found. Collectors especially value its frequent role as a pseudomorph, faithfully replacing \u003cstrong\u003epyrite\u003c\/strong\u003e, \u003cstrong\u003emarcasite\u003c\/strong\u003e, \u003cstrong\u003esiderite\u003c\/strong\u003e, and even gypsum while preserving the original crystal form.\u003c\/p\u003e\u003cp\u003eClassic crystallized specimens come from the \u003cstrong\u003eRestormel Royal Iron Mine\u003c\/strong\u003e in Cornwall, England, and the \u003cstrong\u003eBotallack mine\u003c\/strong\u003e, while Germany's \u003cstrong\u003eSiegen\u003c\/strong\u003e district and \u003cstrong\u003eHerdorf\u003c\/strong\u003e (the type locality) remain historically important. In the United States, the \u003cstrong\u003eLake George\u003c\/strong\u003e and \u003cstrong\u003eCrystal Peak\u003c\/strong\u003e pegmatite areas of Colorado produce exceptionally lustrous acicular sprays, and Michigan's \u003cstrong\u003eIshpeming\u003c\/strong\u003e and Keweenaw Peninsula districts supply fine layered and banded material. Notable pseudomorphs after pyrite are found at \u003cstrong\u003ePelican Point, Utah\u003c\/strong\u003e, while Morocco's \u003cstrong\u003eBou Tazoult\u003c\/strong\u003e and Egypt's \u003cstrong\u003eFarfara Oasis\u003c\/strong\u003e yield striking acicular and branching goethite in geodes.\u003c\/p\u003e\u003cp\u003eGoethite is also a common inclusion in quartz and amethyst, producing golden-brown needle sprays sometimes marketed under names like cacoxenite amethyst, and its iridescent, rainbow-toned coatings from localities such as Spain's \u003cstrong\u003eTharsis\u003c\/strong\u003e mine make it a favorite among mineral and gemstone collectors alike. Its velvety botryoidal crusts, dramatic pseudomorph forms, and rich brown-to-black color range make goethite a rewarding species for both systematic collections and display specimens.\u003c\/p\u003e","products":[{"product_id":"fa15-crocoite-australia","title":"CROCOITE – Vivid Red Intertwined Crystals on Goethite, Tasmania, Australia","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eNatural Crocoite from the legendary Red Lead Mine, Dundas mineral field, Tasmania — Australia's most iconic and internationally celebrated mineral species. Vivid red, intricately intertwined crystals set against striking black goethite, creating a dramatic color contrast prized by collectors worldwide.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 109 × 69 × 57 mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 407 g\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Red Lead Mine, Dundas mineral field, West Coast, Tasmania, Australia\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45444251877485,"sku":null,"price":185.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260215184133.jpg?v=1783636340"}],"url":"https:\/\/www.italmineral.com\/collections\/goethite.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}