Kyanite

specimen number:
1712713

location:
Nani, Loliondo, Arusha, Tanzania

description:
An unusual translucent lustrous orange crystal of kyanite. In super condition.

The Nani Hill locality, situated near the town of Loliondo within the Ngorongoro District of the Arusha Region, northern Tanzania, represents a unique mineralogical occurrence celebrated globally for producing the world's finest and most unusual orange kyanite specimens. Geologically, this highly specialized deposit is hosted within ancient, highly deformed metamorphic rocks belonging to the Neoproterozoic-age Mozambique Orogenic Belt, a massive crustal suture zone characterized by intense regional heat and pressure. Unlike typical kyanite deposits that yield dull blue or green blades, the silicate crystals at Nani Hill formed within localized, quartz-rich hydrothermal veins where the incorporating fluids contained high concentrations of manganese, which replaced aluminum in the crystal lattice and imparted an extraordinary, vibrant safety-orange to deep ginger-gold coloration. Historically, the deposit was accidentally discovered by local Maasai pastoralists in late 2007, triggering an immediate and chaotic rush of independent artisanal prospectors who quickly established manual surface trenches and shallow pits along the hillside. Commercialized artisanal extraction reached its absolute peak between 2008 and 2010, when thousands of carats of gem-grade rough and sharp, tabular crystal clusters were recovered for the international lapidary and mineral markets before the initial, shallow vein pockets were rapidly depleted.

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