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Tanzanite is a blue variety of the gray to greenish mineral zoisite. The first finds of the transparent, purple-bluish to lilac colored tanzanite were made in 1967 in northern Tanzania .

The only minable and commercially used deposit of high-quality tanzanite crystals is still in the Gilewy Hills near Arusha in Tanzania. However, the current finds rarely match the outstanding quality of earlier years.

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