Tanzanite - purple/blue Zoisite variety.
Location: Merelani Hills, Simanjiro, Manyara, Tanzania.
2cm long translucent prismatic sub-euhedral crystal, striated on one side. It occurs in hydrothermal veins that cut brecciated and fractured gneisses, rich in Zoisite, Diopside, Graphite and Quartz.