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Mohamed Mattash's image
Question added by Mohamed Mattash Head of Hadramawt consulting center for geological studies and researches MEMC, Hadramawt consulting center, University of Hadramawt
9 years ago
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Rizwan Haider's image  
Answer added by  Rizwan Haider
6 years ago

tanzanite is di-chronic gemstone having blue and violet colors. it have specific gravity of 3.4 and refractive index of 1.7 . it's have 6.5-7 hardness, sometimes it& ... See More