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  • Olivier, Bernard (Stellenbosch : University of Stellenbosch, 2006-12)
    Tanzanite, a blue/violet gemstone variety of zoisite (Ca2Al2O.AlOH[Si2O7][SiO4]) is only produced in NE Tanzania. The only known locality is an approximately 7km2 deposit in the Merelani area. It is one of the most sought ...