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What is the difference between tanzanite and azurite?

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Question added by Mohamed Mattash , Head of Hadramawt consulting center for geological studies and researches , MEMC, Hadramawt consulting center, University of Hadramawt
Date Posted: 2014/12/22

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's have columns striations. while azurite have dark blue to purple color . it's have specific gravity of 3.7 and refractive index of 1.83 . it's have 4 hardness at moh's scale. 

 

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