{"title":"Vivianite","description":"\u003cp\u003e\u003cstrong\u003eVivianite\u003c\/strong\u003e is a hydrated iron phosphate, Fe3(PO4)2·8H2O, prized by collectors for its striking prismatic to bladed crystals in shades of deep blue, bluish-green and even purplish-black. Fresh crystals are pale and almost colorless, but light-induced oxidation gradually darkens them through blue, green and purple tones — a fascinating internal transformation, unrelated to any exposure to air or moisture, that gives every specimen its own unique character.\u003c\/p\u003e\u003cp\u003eThe finest gem-grade material comes from \u003cstrong\u003eBolivia\u003c\/strong\u003e, especially the \u003cstrong\u003eSiglo XX Mine\u003c\/strong\u003e and \u003cstrong\u003eSan José\/San Firmín vein\u003c\/strong\u003e at Llallagua, producing transparent bottle-green prisms on botryoidal goethite matrix. \u003cstrong\u003eBrazil's Cigana Mine\u003c\/strong\u003e in Minas Gerais yields wedge-shaped crystals sparkling with muscovite and pyrite, while the \u003cstrong\u003eKerch Peninsula\u003c\/strong\u003e on the Black Sea is legendary for dark, spear-like blue-green blades, and \u003cstrong\u003eCameroon\u003c\/strong\u003e has produced the world's largest known vivianite crystals, exceeding a meter in length. The species' type locality, \u003cstrong\u003eWheal Kind\u003c\/strong\u003e in Cornwall, England, anchors its history to 1817, while \u003cstrong\u003eBlackbird Mine\u003c\/strong\u003e in Idaho is famous for rare purple-zoned crystals.\u003c\/p\u003e\u003cp\u003eVivianite forms in bog iron deposits, phosphate-rich pegmatites, glauconitic clays and hydrothermal veins, often replacing fossil bone, shell and peat. Collectors seek it for its rich color saturation, dramatic crystal habit and evocative genesis stories — but every piece demands careful, low-light storage to preserve its color against the mineral's natural tendency to darken over time.\u003c\/p\u003e","products":[{"product_id":"vog-conchiglia-con-vivianite-russia","title":"VIVIANITE – Fossilized Shell with Black \u0026 Blue Crystals from Kerch, Crimea","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eA striking Vivianite specimen from the Kerch Peninsula in Crimea, formed entirely within a well-preserved fossilized mollusk shell. Deep black to blue prismatic crystals fill the shell's interior, creating a dramatic contrast against the pale, calcified surface of the fossil host — a piece as much of paleontological interest as mineralogical, combining a natural fossil matrix with an aesthetically striking crystal growth rarely seen together in a single specimen.\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 8.0 x 6.5 x 4.2 cm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 148 g\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Quarry E, Kamysh-Burun Trough, Kerchenskoe deposit, Kerch Peninsula, Crimea, Ukraine or Russia\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45460306493549,"sku":null,"price":129.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/IMG20250101032749.jpg?v=1784133727"}],"url":"https:\/\/www.italmineral.com\/collections\/vivianite.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}