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Tanzanite: A Rare, Lovely And Unique Gemstone - By: Andrew Stratton, 2009-06-19 Unique. Rare. Beautiful. Blue. These are all words that can be used to describe the gemstone tanzanite. So, what exactly is it? This gemstone is made up of calcium aluminium silicate and is actually a member of the zoisite family of gemstones. But, because of its rarity and sheer beauty, it gets its own category. COMMENTS Add a comment |