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Tanzanite is a blue to violet gemstone which is a member of the zoisite mineral group.Tanzanite is pleochroic, which means that it shows different colors depending on the viewing angle. The vivid blue of tanzanite can rival fine sapphire and makes tanzanite an extremely desirable gemstone. Tanzanite exhibits perfect cleavage with an uneven fracture.Tanzanite has an attractive vitreous luster. Tanzanite is the birth stone of December.