{{Infobox mineral | name = Tanzanite | category = Mineral Variety | boxwidth = | boxbgcolor = | image = Tanzanite cut.jpg | caption = Tanzanite gemstone, featuring an oval mixed cut | formula = (Ca₂Al₃(SiO₄)(Si₂O₇)O(OH)) | color = Purple to Blue | habit = Crystals flattened in an acicular manner, may be fibrously curved | system = Orthorhombic | twinning = | cleavage = Perfect {010} imperfect {100} | fracture = Uneven to conchoidal | mohs = 6.5 | luster = Vitreous, pearly on cleavage surfaces | refractive = 1.69-1.70 | opticalprop = biaxial positive | birefringence = 0.006-0.018 | pleochroism = Present, dichroism or trichroism depending on color. | streak = White or colorless | gravity = 3.10-3.38 | Density = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = only found in Tanzania }}

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