{"title":"Tanzania","description":"\u003cp\u003eTanzania is East Africa's premier gem-mineral country, built on the ancient \u003cstrong\u003eTanzania Craton\u003c\/strong\u003e and ringed by the metamorphic \u003cstrong\u003eMozambique Belt\u003c\/strong\u003e, whose Pan-African graphitic marbles and gneisses host the world's most concentrated gem-pegmatite and hydrothermal deposits. No locality on Earth is more celebrated than \u003cstrong\u003eMerelani Hills\u003c\/strong\u003e near Arusha, the sole commercial source of \u003cstrong\u003etanzanite\u003c\/strong\u003e, the blue-violet variety of \u003cstrong\u003ezoisite\u003c\/strong\u003e colored by trace vanadium, and also a producer of fine green grossular garnet (\u003cstrong\u003etsavorite\u003c\/strong\u003e), \u003cstrong\u003ediopside\u003c\/strong\u003e, \u003cstrong\u003eprehnite\u003c\/strong\u003e, and \u003cstrong\u003emagnesio-axinite\u003c\/strong\u003e on the same graphitic-marble matrix. Nearby occurrences in the Simanjiro District, including \u003cstrong\u003eLandanai\u003c\/strong\u003e, yield vivid chromium-bearing \u003cstrong\u003edravite\u003c\/strong\u003e, marketed as chrome tourmaline, associated with calcite, pyrite, and rutile in marble.\u003c\/p\u003e\u003cp\u003eSouthern Tanzania is equally storied for collectors: the \u003cstrong\u003eMahenge\u003c\/strong\u003e district in Morogoro Region is world-famous for gem-quality red-pink \u003cstrong\u003espinel\u003c\/strong\u003e crystals and octahedra, alongside garnet and tourmaline, while the \u003cstrong\u003eUmba Valley\u003c\/strong\u003e in the north produces a striking rainbow of \u003cstrong\u003ecorundum\u003c\/strong\u003e (ruby and sapphire) and multicolored garnets—almandine, pyrope, spessartite, and color-change grossular—colored by iron, chromium, manganese, and vanadium. \u003cstrong\u003eTunduru\u003c\/strong\u003e and \u003cstrong\u003eSongea\u003c\/strong\u003e in Ruvuma Region, and \u003cstrong\u003eWinza\u003c\/strong\u003e in Dodoma, add further alluvial sapphire, ruby, and garnet finds, while \u003cstrong\u003eSangolungulu\u003c\/strong\u003e is a classic source of lustrous spessartite garnet on mica. Morogoro itself has also produced fine gemmy \u003cstrong\u003edanburite\u003c\/strong\u003e crystals, a scarcer species prized by systematic collectors.\u003c\/p\u003e\u003cp\u003eWhat makes Tanzanian material so desirable is this rare combination of monomineralic rarity—tanzanite exists commercially nowhere else—with genuine mineralogical diversity spanning silicates, garnets, spinels, and borosilicates, all tied to a single dynamic Precambrian-to-Pan-African geological history. Merelani specimens showing tanzanite intergrown with diopside or prehnite, Mahenge spinel on matrix, and Umba parti-color garnets are especially sought by museums and connoisseurs, since Tanzania's artisanal mining methods often preserve natural crystal faces and matrix relationships lost in more mechanized mining regions. For collectors seeking East African provenance, aesthetic crystal habit, and true species rarity, Tanzania remains an essential country of origin.\u003c\/p\u003e","products":[{"product_id":"a0-rubino-1","title":"RUBY – Doubly Terminated Pink Corundum Crystal, Morogoro, Tanzania","description":"\u003cp\u003eAn exceptional specimen from the marble-hosted ruby deposits of the Morogoro Region: elongated pink ruby crystals emerging dramatically from a pale, contrasting matrix. The largest crystal, a superb doubly terminated individual, reaches 33mm in length, displaying well-formed faces and an intense, elegant pink tone that collectors of rare and important minerals especially prize.\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 82 x 56 x 46 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 256 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProvenance:\u003c\/strong\u003e Gairo District, Morogoro Region, Tanzania\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ITALMINERAL","offers":[{"title":"Default Title","offer_id":45732487692397,"sku":null,"price":119.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8027\/6333\/files\/AGC_20250607_164849752.jpg?v=1787996556"}],"url":"https:\/\/www.italmineral.com\/collections\/tanzania.oembed","provider":"ITALMINERAL","version":"1.0","type":"link"}