{"title":"Limonite","description":"\u003cp\u003e\u003cstrong\u003eLimonite\u003c\/strong\u003e is one of the most familiar names in mineralogy, yet it is not a true mineral species but a field term for massive, earthy, hydrated iron oxide material lacking visible crystal form. Chemically it is dominated by \u003cstrong\u003egoethite\u003c\/strong\u003e, though the term also covers intergrowths of \u003cstrong\u003elepidocrocite\u003c\/strong\u003e, \u003cstrong\u003eakaganeite\u003c\/strong\u003e, \u003cstrong\u003ehematite\u003c\/strong\u003e, \u003cstrong\u003emaghemite\u003c\/strong\u003e and \u003cstrong\u003ejarosite group\u003c\/strong\u003e species, often mixed with clay and quartz. Its color ranges from ochre-yellow to dark brown with a diagnostic yellow-brown streak, a hardness of 4 to 5.5 and specific gravity between 2.7 and 4.3. Because individual crystals are absent, limonite typically forms botryoidal, reniform, stalactitic, mammillary or concretionary masses, and it frequently develops as striking pseudomorphs after \u003cstrong\u003epyrite\u003c\/strong\u003e, \u003cstrong\u003emarcasite\u003c\/strong\u003e, \u003cstrong\u003esiderite\u003c\/strong\u003e and even \u003cstrong\u003ealmandine garnet\u003c\/strong\u003e, preserving the sharp faces of the original crystal while the interior converts entirely to iron oxide.\u003c\/p\u003e\u003cp\u003eLimonite forms wherever iron-bearing minerals weather under oxidizing, hydrated conditions, making it a near-universal secondary mineral in gossans, laterites and bog-iron deposits worldwide. Classic collector localities include the historic iron mines of \u003cstrong\u003eIronton\u003c\/strong\u003e and the Cuyuna Range in \u003cstrong\u003eMinnesota\u003c\/strong\u003e, the pseudomorph-rich hilltops of \u003cstrong\u003eRichland County, Wisconsin\u003c\/strong\u003e, and the \u003cstrong\u003eBayerland mine\u003c\/strong\u003e in Bavaria, \u003cstrong\u003eGermany\u003c\/strong\u003e, prized for well-formed botryoidal crusts. \u003cstrong\u003eCyprus\u003c\/strong\u003e is historically famous for its brilliant yellow ochre limonite, long exploited as a pigment, while the gossan cappings of sulfide deposits in \u003cstrong\u003eArizona\u003c\/strong\u003e and the nickel-bearing lateritic ores of \u003cstrong\u003eCuba\u003c\/strong\u003e and New Caledonia represent economically important, large-scale occurrences. In \u003cstrong\u003eBrazil\u003c\/strong\u003e, deeply weathered banded iron formations concentrated gold within limonite-rich soils, linking the mineral to important historic gold districts, and African deposits provided some of the earliest iron ore smelted by ancient metallurgists.\u003c\/p\u003e\u003cp\u003eFor collectors, limonite's appeal lies in its textural variety and its role as a pseudomorph-forming mineral: sharp cubic and pyritohedral casts after pyrite, radiating stalactitic growths, and glossy botryoidal \"kidney iron\" surfaces are all sought after as display specimens. Its long history as brown and yellow ochre pigment, its use as low-grade iron ore known as \"brown hematite\" or \"bog iron,\" and its role as a gossan indicator guiding prospectors toward buried gold, silver and copper veins all add historical and scientific interest beyond its aesthetic qualities. Because true crystals never form, fine limonite specimens are valued for habit, luster and locality rather than crystallography, making documented pieces from classic mines especially desirable to systematic mineral collections.\u003c\/p\u003e","products":[{"product_id":"smoky-quartz-cluster-with-gwindel-furka-pass-switzerland","title":"SMOKY QUARTZ – Alpine Cluster with Twisted Gwindel Crystal, Switzerland","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eNatural Smoky Quartz cluster from the Furka Pass area, Valais, Switzerland, featuring regular prismatic crystals alongside a small, gently curved gwindel — one of the rarest and most sought-after quartz growth forms in the world. Set on natural brownish matrix, likely with limonite staining, this is a genuinely uncommon combination for collectors.\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 95 × 75 × 35 mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 123 g\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Furka Pass area, Oberwald, Obergoms, Goms, Valais, Switzerland\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45451791695981,"sku":null,"price":129.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260213181208.jpg?v=1783875144"},{"product_id":"quartz-with-limonite-orange-crystal-disentis-switzerland","title":"QUARTZ WITH LIMONITE – Vivid Orange Alpine Crystal, Disentis, Switzerland","description":"\u003cp\u003eA striking natural quartz crystal from the classic Swiss Alpine-fissure locality of Gronda da Cavrein Valley, near Disentis. The crystal displays excellent face development and a vivid, intense orange coloration produced by a surface crystallization of limonite, giving the piece remarkable aesthetic appeal and a refined, collector-grade presence.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 91 x 89 x 53 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 289 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Gronda da Cavrein Valley, Russein Valley, Disentis, Surselva Region, Grisons, Switzerland\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45737009807469,"sku":null,"price":99.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20251106231646.jpg?v=1788061422"},{"product_id":"yellow-quartz-crystal-cluster-gran-paradiso-italy","title":"YELLOW QUARTZ – Large Prismatic Yellow Cluster, Gran Paradiso, Italy","description":"\u003cp\u003eAn impressive cluster of prismatic Quartz crystals from the Gran Paradiso Massif in the Aosta Valley, Italy, showing a striking colour zoning from milky white to honey yellow caused by surface coatings of Limonite. Several crystals reach considerable size within the group, displaying bright, well-formed faces typical of alpine-cleft genesis. This is a naturally formed specimen recovered from a fissure within alpine metamorphic rocks, a classic and prized occurrence type among European quartz collectors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMineral Data:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 205 x 138 x 73 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1351 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Gran Paradiso Massif, Aosta Valley, Italy\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45737681322093,"sku":null,"price":179.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20260809185245.jpg?v=1788068061"}],"url":"https:\/\/www.italmineral.com\/collections\/limonite.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}